mirror of https://github.com/nmlgc/ReC98.git
58 lines
858 B
NASM
58 lines
858 B
NASM
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; master library - PC98 - MSDOS - EMS
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;
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; Description:
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; EMSメモリの確保
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;
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; Function/Procedures:
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; unsigned ems_allocate( unsigned long size ) ;
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;
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;
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; Parameters:
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; unsigned long size 確保するバイト数。
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;
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; Returns:
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; int 0 ... 失敗
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; else EMSハンドル
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;
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; Binding Target:
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; Microsoft-C / Turbo-C / Turbo Pascal
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;
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; Running Target:
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; PC-9801
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;
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; Requiring Resources:
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; CPU: 8086
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; EMS: LIM EMS 3.2
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;
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; Notes:
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;
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;
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; Compiler/Assembler:
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; TASM 3.0
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; OPTASM 1.6
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;
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; Author:
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; 恋塚昭彦
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;
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; Revision History:
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; 92/11/16 Initial
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; 92/12/15 計算をちょいと改良
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func EMS_ALLOCATE
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mov BX,SP
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mov CX,SS:[BX+(RETSIZE)*2] ; lo
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mov BX,SS:[BX+(RETSIZE)*2+2] ; hi
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shl CX,1
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rcl BX,1
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shl CX,1
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rcl BX,1
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cmp CX,1
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sbb BX,-1
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mov AH,43h ; function: Allocate Pages
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int 67h ; call EMM
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sub AH,1
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sbb AX,AX
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and AX,DX
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ret 4
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endfunc
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