| 1 |
figdor32 |
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; DX = String ptr |
| 2 |
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DOS_PrintString: |
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MOV AH, DISPLAY_STRING |
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INT 21H |
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RET |
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| 7 |
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; DX = Filename ptr |
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; CF = 1 Error CF = 0 Pass |
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; AX = File handle/Error code if CF |
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DOS_OpenReadonly: |
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CLC ; Technically not needed, but, uhm... |
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MOV AL, OPEN_ACCESS_READONLY |
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MOV AH, OPEN_FILE ; AH = 3Dh Open a file, DX = Filename ptr, AL = Access control, handle at AX if CF set |
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INT 21H |
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RET |
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; BX = File Handle |
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DOS_CloseFile: |
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MOV AH, CLOSE_FILE |
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INT 21H |
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RET |
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; BX = Paragraphs to allocate |
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; CF = 1 Error CF = 0 Pass |
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; AX = Segment addr/Error code if CF |
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DOS_AllocateMemory: |
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MOV AH, ALLOCATE_MEMORY |
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INT 21H |
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RET |
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| 31 |
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; ES = Segment to free |
| 32 |
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; CF = 1 Error CF = 0 Pass |
| 33 |
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; AX = Error code if CF |
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DOS_FreeMemory: |
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MOV AH, FREE_MEMORY |
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INT 21H |
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RET |
| 38 |
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| 39 |
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; BX = File Handle |
| 40 |
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; CX = Number of bytes to read |
| 41 |
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; DX = Offset in the buffer |
| 42 |
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; ES = Memory segment |
| 43 |
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; CF = 1 Error CF = 0 Pass |
| 44 |
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; AX = Number of bytes read/Error code if CF |
| 45 |
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DOS_ReadFileIntoES: |
| 46 |
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PUSH DS ; Store the DS for later |
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MOV AX, ES ; Yes |
| 48 |
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MOV DS, AX ; DS = allocated memory segment |
| 49 |
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MOV AH, READ_FILE ; Read file |
| 50 |
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INT 21H ; Magic |
| 51 |
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POP DS ; Restore DS |
| 52 |
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RET |
| 53 |
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| 54 |
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; BX = File Handle |
| 55 |
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; CX = Number of bytes to read |
| 56 |
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; DS:DX = Buffer address |
| 57 |
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; CF = 1 Error CF = 0 Pass |
| 58 |
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; AX = Number of bytes read/Error code if CF |
| 59 |
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DOS_ReadFile: |
| 60 |
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MOV AH, READ_FILE ; Read file |
| 61 |
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INT 21H ; Magic |
| 62 |
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RET |
