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pascal@19515
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1 ;***************************************************************
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pascal@19515
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2 ;****** This file is distributed under GPL
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pascal@19515
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3 ;***************************************************************
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pascal@19515
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4 ideal
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pascal@19515
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5 %crefref
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pascal@19515
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6 %noincl
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pascal@19515
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7 %nomacs
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pascal@19636
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8 ifdef NO386
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pascal@19636
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9 p8086
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pascal@19636
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10 else
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pascal@19515
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11 p386
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pascal@19636
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12 endif
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pascal@19515
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13
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pascal@19515
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14 group DGROUP _TEXT,_DATA,_BSS
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pascal@19515
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15 assume cs:DGROUP,ds:DGROUP
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pascal@19515
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16
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pascal@19515
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17
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pascal@19515
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18 segment _DATA byte public use16 'DATA'
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pascal@19515
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19
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pascal@19515
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20 global _topmem:dword
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pascal@19515
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21
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pascal@19515
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22 _topmem dd 10000000h ; max 256m
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pascal@19515
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23
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pascal@19515
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24 ends _DATA
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pascal@19515
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25
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pascal@19515
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26 segment _BSS byte public use16 'BSS'
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pascal@19515
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27
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pascal@19515
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28 saved15 dd ?
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pascal@19515
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29
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pascal@19515
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30 ends _BSS
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31
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pascal@19515
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32
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pascal@19515
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33 segment _TEXT byte public use16 'CODE'
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pascal@19515
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34
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pascal@19515
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35 ;***************************************************************
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pascal@19515
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36 ;u32 memtopz();
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pascal@19515
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37 ;***************************************************************
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pascal@19515
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38 global _memtopz:near
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pascal@19515
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39 proc _memtopz near
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pascal@19515
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40 ;***************************************************************
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pascal@19515
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41 ;u32 memtop_e801()
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pascal@19515
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42 ;***************************************************************
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pascal@19515
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43 ; proc _memtop_e801 near
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pascal@19515
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44
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pascal@19571
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45 ;push cx bx
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pascal@19515
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46 xor cx,cx ;fix to work around buggy
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pascal@19515
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47 xor dx,dx ; BIOSes which dont clear/set
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pascal@19515
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48 stc ; carry on pass/error of
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pascal@19515
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49 mov ax,0E801h
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pascal@19515
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50 int 15h
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pascal@19515
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51 jc @@err
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pascal@19515
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52 test cx,cx ;kludge to handle BIOSes
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pascal@19515
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53 jnz @@use_cxdx ; which report their extended
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pascal@19515
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54 test dx,dx ; memory in AX/BX rather than
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pascal@19515
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55 jnz @@use_cxdx ; CX/DX. The spec I have read
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pascal@19515
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56 @@use_axbx: mov dx,bx ; seems to indicate AX/BX
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pascal@19879
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57 ;jmp @@end_kludge ; are more reasonable anyway...
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pascal@19879
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58 db 0a8h ; test al,im opcode
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pascal@19515
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59 @@use_cxdx: xchg ax,cx
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pascal@19515
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60 @@end_kludge: ;now: dx=64k units above 16m
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pascal@19515
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61 ; ax=1k units above 1m below 16m (max 3c00h)
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pascal@19571
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62 ;pop bx cx
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pascal@19515
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63 test dx,dx
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pascal@19515
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64 jz tokb ;dx=0 here, ax=kbs above 1m
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pascal@19515
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65 xor ax,ax ;ignore info on low 16M (assume full)
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pascal@19515
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66 ;add dx,100h ;account for low 16M
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pascal@19515
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67 inc dh ;account for low 16M (optimized)
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pascal@19515
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68 ret
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pascal@19515
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69 @@err:
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pascal@19515
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70 ; xor ax,ax
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pascal@19515
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71 ; cwd
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pascal@19515
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72 ; ret
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pascal@19515
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73 ; endp _memtop_e801
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pascal@19515
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74
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pascal@19515
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75
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pascal@19515
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76 ;***************************************************************
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pascal@19515
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77 ;u32 memtop_88()
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pascal@19515
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78 ;***************************************************************
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pascal@19515
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79 ; proc _memtop_88 near
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pascal@19515
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80
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pascal@19515
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81 mov ah,88h
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pascal@19515
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82 int 15h ;ax=kbs above 1m
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pascal@19515
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83 jnc @@ok ; error: cf=1 or ax=0
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pascal@19515
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84 xor ax,ax ;
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pascal@19515
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85 @@ok:
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pascal@19634
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86 ; xor dx,dx
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pascal@19515
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87 test ax,ax ;happens on big mem systems
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pascal@19879
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88 jnz tokb
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pascal@19879
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89
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pascal@19879
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90 ;***************************************************************
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pascal@19879
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91 ;u32 memtop_cmos()
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pascal@19879
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92 ;***************************************************************
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pascal@19879
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93
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pascal@19879
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94 ;memtop_cmos:
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pascal@19879
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95 pushf
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pascal@19879
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96 cli
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pascal@19879
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97 call rdcmos17
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pascal@19879
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98 popf
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pascal@19515
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99 tokb:
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pascal@19634
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100 xor dx,dx
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pascal@19515
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101 add ah,4h ;account for 1024 low kb
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pascal@19515
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102 adc dx,dx ; (optimized to death)
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pascal@19515
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103 ifndef NO386
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pascal@19515
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104 shld dx,ax,10 ;multiply by 1024
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pascal@19515
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105 shl ax,10 ; (kbytes -> bytes)
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pascal@19515
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106 else
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pascal@19515
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107 @@lp:
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pascal@19515
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108 mov cx,10
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pascal@19515
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109 shl ax,1 ;multiply by 1024
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pascal@19515
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110 rcl dx,1
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pascal@19515
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111 loop @@lp
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pascal@19515
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112 endif
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pascal@19515
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113 ; mov cx,ax
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pascal@19515
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114 ; or cx,dx ;update ZF
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pascal@19515
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115 ;@@fail:
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pascal@19515
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116 ret
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pascal@19515
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117 ; endp _memtop_88
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pascal@19515
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118
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pascal@19515
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119 ; proc _memtopz near
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pascal@19515
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120
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pascal@19515
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121 ; call _memtop_e801
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pascal@19515
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122 ; jnz @@ok
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pascal@19515
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123 ; call _memtop_88
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pascal@19515
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124 ; jnz @@ok
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pascal@19879
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125 ; jmp memtop_cmos
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pascal@19515
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126
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pascal@19515
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127 rdcmos17: mov al,18h ; read bytes 17-18 from CMOS
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pascal@19515
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128 call @@rdcmos
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pascal@19515
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129 mov ah,al
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pascal@19515
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130 mov al,17h
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pascal@19515
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131 @@rdcmos: out 70h,al
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pascal@19515
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132 call @@ret
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pascal@19515
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133 in al,71h
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pascal@19515
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134 @@ret:
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pascal@19515
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135 ret
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pascal@19515
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136
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pascal@19515
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137
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pascal@19515
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138 ;***************************************************************
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pascal@19515
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139 ;u32 memtop();
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pascal@19515
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140 ;***************************************************************
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pascal@19515
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141 global _memtop:near
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pascal@19515
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142 _memtop:
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pascal@19515
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143 call _memtopz
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pascal@19515
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144 mov cx,40h ; min 4m
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pascal@19515
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145 ; If reported mem is ridiculously low, presume
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pascal@19515
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146 ; we had trouble detecting memory size
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pascal@19515
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147 cmp dx,cx
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pascal@19515
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148 jb @@set
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pascal@19515
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149 mov cx,[word _topmem+2] ; max 256m ?
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pascal@19515
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150 ; Kernel can have trouble with initrd at very high addr:
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pascal@19515
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151 ; limit mem top to 256m
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pascal@19515
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152 cmp dh,ch
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pascal@19515
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153 jb @@done
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pascal@19515
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154 @@set:
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pascal@19515
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155 xchg ax,cx
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pascal@19515
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156 cwd
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pascal@19515
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157 xchg ax,dx
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pascal@19515
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158 @@done:
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pascal@19515
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159 ; Round down to page boundary.
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pascal@19515
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160 ; Or else initrd's tail may end up in last, partial page.
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pascal@19515
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161 ; Kernel will refuse to use such initrd.
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pascal@19515
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162 and ax,0f000h
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pascal@19515
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163 ;@@ok:
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pascal@19515
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164 ret
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pascal@19515
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165
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pascal@19515
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166 endp _memtopz
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pascal@19515
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167
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pascal@19515
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168 ;***************************************************************
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pascal@19515
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169 ;void hook_int15_88();
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pascal@19515
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170 ;***************************************************************
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pascal@19515
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171 global _hook_int15_88:near
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pascal@19515
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172 proc _hook_int15_88 near
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pascal@19515
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173
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pascal@19515
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174 ifndef xmm_hook
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pascal@19515
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175 mov ax,4300h
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pascal@19571
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176 cwd
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pascal@19876
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177 mov es,dx
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pascal@19515
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178 int 2fh
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pascal@19571
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179 cmp al,80h ; 80h = XMS driver installed
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pascal@19515
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180 je @@skip
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pascal@19515
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181 endif
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pascal@19571
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182 ifndef NO386
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pascal@19876
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183 ifdef xmm_hook
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pascal@19515
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184 push 0
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pascal@19515
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185 pop es
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pascal@19876
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186 endif
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pascal@19876
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187 push cs
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pascal@19876
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188 push offset int15_88
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pascal@19876
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189 pop eax
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pascal@19876
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190 xchg eax,[es:15*4]
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pascal@19515
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191 mov [saved15],eax
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pascal@19515
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192 else
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pascal@19876
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193 ifdef xmm_hook
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pascal@19876
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194 xor ax,ax
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pascal@19876
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195 mov es,ax
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pascal@19876
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196 endif
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pascal@19876
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197 mov ax,offset int15_88
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pascal@19876
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198 xchg ax,[es:15*4]
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pascal@19515
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199 mov [word saved15],ax
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pascal@19876
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200 mov ax,cs
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pascal@19876
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201 xchg ax,[es:15*4+2]
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pascal@19515
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202 mov [word saved15+2],ax
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pascal@19515
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203 endif
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pascal@19515
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204 @@skip:
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pascal@19515
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205 ret
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pascal@19515
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206 int15_88:
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pascal@19515
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207 cmp ah,88h
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pascal@19515
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208 je @@do88
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pascal@19876
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209 @@jmp_saved15:
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pascal@19515
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210 jmp [saved15]
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pascal@19515
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211 @@do88:
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pascal@19515
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212 pushf
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pascal@19876
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213 call @@jmp_saved15
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pascal@19515
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214 test ax,ax
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pascal@19515
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215 jnz @@iret
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pascal@19515
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216
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pascal@19515
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217 ;****** Read extended mem size (CMOS bytes 17h,18h (lo,hi))
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pascal@19515
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218 call rdcmos17
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pascal@19515
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219 @@iret:
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pascal@19515
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220 iret
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pascal@19515
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221
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pascal@19515
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222 endp _hook_int15_88
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pascal@19515
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223
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pascal@19515
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224 ends _TEXT
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pascal@19515
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225
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pascal@19515
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226 end
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pascal@19515
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227
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pascal@19515
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228 ;###### END OF FILE ############################################
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