Home » Archimedes archive » Acorn User » AU 1995-02.adf » !StarInfo_StarInfo » Bower/PCEmUtils/Disassem/VDU
Bower/PCEmUtils/Disassem/VDU
This website contains an archive of files for the Acorn Electron, BBC Micro, Acorn Archimedes, Commodore 16 and Commodore 64 computers, which Dominic Ford has rescued from his private collection of floppy disks and cassettes.
Some of these files were originally commercial releases in the 1980s and 1990s, but they are now widely available online. I assume that copyright over them is no longer being asserted. If you own the copyright and would like files to be removed, please contact me.
| Tape/disk: | Home » Archimedes archive » Acorn User » AU 1995-02.adf » !StarInfo_StarInfo |
| Filename: | Bower/PCEmUtils/Disassem/VDU |
| Read OK: | ✔ |
| File size: | 0561 bytes |
| Load address: | 0000 |
| Exec address: | 0000 |
File contents
c:\drdos\vdu.com Disassembled and edited 12th August 1994 Purpose: To send a code through "OS_WriteC" from the PC Emulator Author : Andrew Bower, August 1994. 0100 PUSH DS ; 0101 MOV AX,0000 ; save return address on stack 0104 PUSH AX ; 0105 PUSH DS 0106 POP ES 0107 MOV BX,0081 ; point to parameter 010A MOV AL,ES:[BX] ; 010D CMP AL,20 ; 010F JNZ 011A ; strip leading zeros 0111 ADD BX,0001 ; 0114 JMPS 010A ; 0116 NOP 0117 NOP 0118 NOP 0119 NOP 011A dc.w FFFF,0101 ; SVC 257 trapped: translates address ES:BX 011E MOV BX,0180 in PC to ARM address (DX:AX) 0121 PUSH CS 0122 POP ES 0123 MOV WORD ES:[0180],0021 SWI &21 = "OS_ReadUnsigned" 012A MOV WORD ES:[0182],0000 0131 MOV WORD ES:[0184],000A default base=10 0138 MOV WORD ES:[0186],0000 013F MOV ES:[0188],AX 0143 MOV ES:[018A],DX 0148 MOV DX,7361 014B MOV AX,6665 014E dc.w FFFF,0102 ; SVC 258 trapped: issues SWI to ARM 0152 MOV AX,ES:[018C] 0156 MOV ES:[0184],AX 015A MOV WORD ES:[0186],0000 0161 MOV WORD ES:[0180],0000 SWI 0 = "OS_WriteC" 0168 MOV WORD ES:[0182],0000 016F MOV DX,7361 0172 MOV AX,6665 0175 dc.w FFFF,0102 ; SWI 0179 RETF 0180 ds.b 128 ; reserve space for SWI parameters
00000000 63 3a 5c 64 72 64 6f 73 5c 76 64 75 2e 63 6f 6d |c:\drdos\vdu.com| 00000010 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 | | 00000020 20 20 20 20 44 69 73 61 73 73 65 6d 62 6c 65 64 | Disassembled| 00000030 20 61 6e 64 20 65 64 69 74 65 64 20 31 32 74 68 | and edited 12th| 00000040 20 41 75 67 75 73 74 20 31 39 39 34 0a 0a 50 75 | August 1994..Pu| 00000050 72 70 6f 73 65 3a 20 54 6f 20 73 65 6e 64 20 61 |rpose: To send a| 00000060 20 63 6f 64 65 20 74 68 72 6f 75 67 68 20 22 4f | code through "O| 00000070 53 5f 57 72 69 74 65 43 22 20 66 72 6f 6d 20 74 |S_WriteC" from t| 00000080 68 65 20 50 43 20 45 6d 75 6c 61 74 6f 72 0a 41 |he PC Emulator.A| 00000090 75 74 68 6f 72 20 3a 20 41 6e 64 72 65 77 20 42 |uthor : Andrew B| 000000a0 6f 77 65 72 2c 20 20 41 75 67 75 73 74 20 31 39 |ower, August 19| 000000b0 39 34 2e 0a 0a 30 31 30 30 20 50 55 53 48 20 20 |94...0100 PUSH | 000000c0 20 44 53 20 20 20 20 20 20 20 20 20 20 20 20 20 | DS | 000000d0 20 3b 0a 30 31 30 31 20 4d 4f 56 20 20 20 20 41 | ;.0101 MOV A| 000000e0 58 2c 30 30 30 30 20 20 20 20 20 20 20 20 20 3b |X,0000 ;| 000000f0 20 73 61 76 65 20 72 65 74 75 72 6e 20 61 64 64 | save return add| 00000100 72 65 73 73 20 6f 6e 20 73 74 61 63 6b 0a 30 31 |ress on stack.01| 00000110 30 34 20 50 55 53 48 20 20 20 41 58 20 20 20 20 |04 PUSH AX | 00000120 20 20 20 20 20 20 20 20 20 20 3b 0a 30 31 30 35 | ;.0105| 00000130 20 50 55 53 48 20 20 20 44 53 0a 30 31 30 36 20 | PUSH DS.0106 | 00000140 50 4f 50 20 20 20 20 45 53 0a 30 31 30 37 20 4d |POP ES.0107 M| 00000150 4f 56 20 20 20 20 42 58 2c 30 30 38 31 20 20 20 |OV BX,0081 | 00000160 20 20 20 20 3b 20 70 6f 69 6e 74 20 74 6f 20 70 | ; point to p| 00000170 61 72 61 6d 65 74 65 72 0a 30 31 30 41 20 4d 4f |arameter.010A MO| 00000180 56 20 20 20 20 41 4c 2c 45 53 3a 5b 42 58 5d 20 |V AL,ES:[BX] | 00000190 20 3b 0a 30 31 30 44 20 43 4d 50 20 20 20 20 41 | ;.010D CMP A| 000001a0 4c 2c 32 30 20 20 20 20 20 20 20 3b 0a 30 31 30 |L,20 ;.010| 000001b0 46 20 4a 4e 5a 20 20 20 20 30 31 31 41 20 20 20 |F JNZ 011A | 000001c0 20 20 20 20 20 3b 20 73 74 72 69 70 20 6c 65 61 | ; strip lea| 000001d0 64 69 6e 67 20 7a 65 72 6f 73 0a 30 31 31 31 20 |ding zeros.0111 | 000001e0 41 44 44 20 20 20 20 42 58 2c 30 30 30 31 20 20 |ADD BX,0001 | 000001f0 20 20 20 3b 0a 30 31 31 34 20 4a 4d 50 53 20 20 | ;.0114 JMPS | 00000200 20 30 31 30 41 20 20 20 20 20 20 20 20 3b 0a 30 | 010A ;.0| 00000210 31 31 36 20 4e 4f 50 0a 30 31 31 37 20 4e 4f 50 |116 NOP.0117 NOP| 00000220 0a 30 31 31 38 20 4e 4f 50 0a 30 31 31 39 20 4e |.0118 NOP.0119 N| 00000230 4f 50 0a 30 31 31 41 20 64 63 2e 77 20 20 20 46 |OP.011A dc.w F| 00000240 46 46 46 2c 30 31 30 31 20 20 20 20 20 20 3b 20 |FFF,0101 ; | 00000250 53 56 43 20 32 35 37 20 74 72 61 70 70 65 64 3a |SVC 257 trapped:| 00000260 20 74 72 61 6e 73 6c 61 74 65 73 20 61 64 64 72 | translates addr| 00000270 65 73 73 20 20 45 53 3a 42 58 0a 30 31 31 45 20 |ess ES:BX.011E | 00000280 4d 4f 56 20 20 20 20 42 58 2c 30 31 38 30 20 20 |MOV BX,0180 | 00000290 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 | | 000002a0 20 20 20 20 20 20 20 20 20 69 6e 20 50 43 20 74 | in PC t| 000002b0 6f 20 41 52 4d 20 61 64 64 72 65 73 73 20 28 44 |o ARM address (D| 000002c0 58 3a 41 58 29 0a 30 31 32 31 20 50 55 53 48 20 |X:AX).0121 PUSH | 000002d0 20 20 43 53 0a 30 31 32 32 20 50 4f 50 20 20 20 | CS.0122 POP | 000002e0 20 45 53 0a 30 31 32 33 20 4d 4f 56 20 20 20 20 | ES.0123 MOV | 000002f0 57 4f 52 44 20 45 53 3a 5b 30 31 38 30 5d 2c 30 |WORD ES:[0180],0| 00000300 30 32 31 20 20 53 57 49 20 26 32 31 20 3d 20 22 |021 SWI &21 = "| 00000310 4f 53 5f 52 65 61 64 55 6e 73 69 67 6e 65 64 22 |OS_ReadUnsigned"| 00000320 0a 30 31 32 41 20 4d 4f 56 20 20 20 20 57 4f 52 |.012A MOV WOR| 00000330 44 20 45 53 3a 5b 30 31 38 32 5d 2c 30 30 30 30 |D ES:[0182],0000| 00000340 0a 30 31 33 31 20 4d 4f 56 20 20 20 20 57 4f 52 |.0131 MOV WOR| 00000350 44 20 45 53 3a 5b 30 31 38 34 5d 2c 30 30 30 41 |D ES:[0184],000A| 00000360 20 20 64 65 66 61 75 6c 74 20 62 61 73 65 3d 31 | default base=1| 00000370 30 0a 30 31 33 38 20 4d 4f 56 20 20 20 20 57 4f |0.0138 MOV WO| 00000380 52 44 20 45 53 3a 5b 30 31 38 36 5d 2c 30 30 30 |RD ES:[0186],000| 00000390 30 0a 30 31 33 46 20 4d 4f 56 20 20 20 20 45 53 |0.013F MOV ES| 000003a0 3a 5b 30 31 38 38 5d 2c 41 58 0a 30 31 34 33 20 |:[0188],AX.0143 | 000003b0 4d 4f 56 20 20 20 20 45 53 3a 5b 30 31 38 41 5d |MOV ES:[018A]| 000003c0 2c 44 58 0a 30 31 34 38 20 4d 4f 56 20 20 20 20 |,DX.0148 MOV | 000003d0 44 58 2c 37 33 36 31 0a 30 31 34 42 20 4d 4f 56 |DX,7361.014B MOV| 000003e0 20 20 20 20 41 58 2c 36 36 36 35 0a 30 31 34 45 | AX,6665.014E| 000003f0 20 64 63 2e 77 20 20 20 46 46 46 46 2c 30 31 30 | dc.w FFFF,010| 00000400 32 20 20 20 20 20 20 3b 20 53 56 43 20 32 35 38 |2 ; SVC 258| 00000410 20 74 72 61 70 70 65 64 3a 20 69 73 73 75 65 73 | trapped: issues| 00000420 20 53 57 49 20 74 6f 20 41 52 4d 0a 30 31 35 32 | SWI to ARM.0152| 00000430 20 4d 4f 56 20 20 20 20 41 58 2c 45 53 3a 5b 30 | MOV AX,ES:[0| 00000440 31 38 43 5d 0a 30 31 35 36 20 4d 4f 56 20 20 20 |18C].0156 MOV | 00000450 20 45 53 3a 5b 30 31 38 34 5d 2c 41 58 0a 30 31 | ES:[0184],AX.01| 00000460 35 41 20 4d 4f 56 20 20 20 20 57 4f 52 44 20 45 |5A MOV WORD E| 00000470 53 3a 5b 30 31 38 36 5d 2c 30 30 30 30 0a 30 31 |S:[0186],0000.01| 00000480 36 31 20 4d 4f 56 20 20 20 20 57 4f 52 44 20 45 |61 MOV WORD E| 00000490 53 3a 5b 30 31 38 30 5d 2c 30 30 30 30 20 20 53 |S:[0180],0000 S| 000004a0 57 49 20 30 20 3d 20 22 4f 53 5f 57 72 69 74 65 |WI 0 = "OS_Write| 000004b0 43 22 0a 30 31 36 38 20 4d 4f 56 20 20 20 20 57 |C".0168 MOV W| 000004c0 4f 52 44 20 45 53 3a 5b 30 31 38 32 5d 2c 30 30 |ORD ES:[0182],00| 000004d0 30 30 0a 30 31 36 46 20 4d 4f 56 20 20 20 20 44 |00.016F MOV D| 000004e0 58 2c 37 33 36 31 0a 30 31 37 32 20 4d 4f 56 20 |X,7361.0172 MOV | 000004f0 20 20 20 41 58 2c 36 36 36 35 0a 30 31 37 35 20 | AX,6665.0175 | 00000500 64 63 2e 77 20 20 20 46 46 46 46 2c 30 31 30 32 |dc.w FFFF,0102| 00000510 20 20 20 20 20 20 3b 20 53 57 49 0a 30 31 37 39 | ; SWI.0179| 00000520 20 52 45 54 46 0a 0a 30 31 38 30 20 64 73 2e 62 | RETF..0180 ds.b| 00000530 20 20 20 31 32 38 20 20 20 20 20 20 20 3b 20 72 | 128 ; r| 00000540 65 73 65 72 76 65 20 73 70 61 63 65 20 66 6f 72 |eserve space for| 00000550 20 53 57 49 20 70 61 72 61 6d 65 74 65 72 73 0a | SWI parameters.| 00000560 0a |.| 00000561
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