| 0,0 → 1,65 |
|---|
| ; |
| ; lists files using first or second FCB provided by COMMAND.COM in PSP |
| ; Copyright (C) 2022 Mateusz Viste |
| ; |
| ; to be assembled with NASM. |
| ; |
| ; lists file entries matching first argument of the program using the default |
| ; unopened FCB entry in PSP as preset by COMMAND.COM. |
| ; |
| ; usage: fcbdir file-pattern |
| ; |
| ; example: fcbdir c:*.txt |
| ; |
| |
| CPU 8086 |
| org 0x100 |
| |
| ; FindFirst_FCB applied to PSP:5C (1st unopened FCB) |
| mov dx, 0x5C |
| mov ah, 0x11 |
| int 0x21 |
| |
| cmp al, 0 |
| jne GAMEOVER |
| |
| NEXT: |
| |
| ; print filename in DTA |
| call PRINTDTA |
| |
| ; FindNext_FCB on PSP until nothing left |
| mov ah, 0x12 |
| mov dx, 0x5C |
| int 0x21 |
| cmp al, 0 |
| je NEXT |
| |
| GAMEOVER: |
| |
| int 0x20 |
| |
| |
| |
| ; ****** print the filename present in the DTA (DTA is assumed at 0x80) ****** |
| PRINTDTA: |
| ; print drive in the DTA |
| mov ah, 0x02 |
| mov dl, [0x80] |
| add dl, 'A' |
| int 0x21 |
| mov dl, ':' |
| int 0x21 |
| ; print filename/extension (in FCB format) |
| mov ah, 0x40 ; write to file |
| mov bx, 1 ; output to stdout |
| mov cx, 11 ; 11 bytes (8+3) |
| mov dx, 0x81 ; filename field at the default DTA location |
| int 0x21 |
| ; print a trailing CR/LF |
| mov ah, 0x02 ; display character in DL |
| mov dl, 0x0D ; CR |
| int 0x21 |
| mov dl, 0x0A ; LF |
| int 0x21 |
| ret |