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C!T ROM 5
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ALIB30B
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MEMORY7.ASM
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Assembly Source File
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1994-12-01
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1KB
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51 lines
PAGE 66,132
;****************************** MEMORY7.ASM *********************************
;
;----------------------------------------------------------------------------
LIBSEG segment byte public "LIB"
assume cs:LIBSEG , ds:nothing
;----------------------------------------------------------------------------
.xlist
include mac.inc
include common.inc
extrn cmos_type:far
extrn cmos_read_word:far
.list
;----------------------------------------------------------------------------
comment
;- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -( MEMORY )
EXT_CHECK - check if EXT memory is present
; inputs: none
; output: ax = size of available extended memory in 1k blocks
; bx = total amount of extended memory installed
;
;* * * * * * * * * * * * * *
public EXT_CHECK
EXT_CHECK proc far
call cmos_type
mov ax,0 ;preload 0
cmp dl,-1
je ext2 ;jmp if cmos unknown type
mov ah,30h ;address of cmos ext_size variable
call cmos_read_word
ext2: push ax ;save total ext memory size
clc ;clear carry
mov ah,88h ;get extended memory size code
int 15h ;call bios
jnc cont_ext1 ;jump if we may have extended memory
clc
jmp ce_exit ;jump if no extended installed
cont_ext1:
pop bx ;get total ext size in 1k blocks
ce_exit:
retf
EXT_CHECK endp
LIBSEG ENDS
;; end