Uit Hack42
Code for the pdp8/f
for this exact specimen
this code is for the machine in the configuration we got it in.
OS8/SYKES Bootstrap Loader
Pasted on paper on the back of the pdp8 8/e 8/f 8/m Pocket Reference Card
| Addr | instr | comment |
|---|---|---|
| 0400 | 1230 | - |
| 0401 | 6321 | - |
| 0402 | 6321 | - |
| 0403 | 7600 | - |
| 0404 | 6322 | - |
| 0405 | 5204 | - |
| 0406 | 6324 | - |
| 0407 | 7106 | - |
| 0410 | 7006 | - |
| 0411 | 3233 | - |
| 0412 | 6322 | - |
| 0413 | 5212 | - |
| 0414 | 6324 | - |
| 0415 | 7012 | - |
| 0416 | 7012 | - |
| 0417 | 0217 | - |
| 0420 | 1233 | - |
| 0421 | 3132 | - |
| 0422 | 2332 | very faint.. |
| 0423 | 2331 | barely readable |
| 0424 | 5204 | - |
| 0425 | 1203 | - |
| 0426 | 6321 | - |
| 0427 | 5014 | faint could be 5017 |
| 0430 | 0401 | faint. |
| 0431 | ? | writing completely gone |
| 0432 | ? | writing completely gone |
Ascii print on teletype
On our machine, the Teletype resides not on the standard address but on address 43/44
0003 7001 INC AC +1 0004 6446 Output char 0005 6441 if flag skip next 0006 5005 JMP 5 0007 5003 JPM 3
code to dump the core of field 0 to a serial port
Bugblue version
There are some jumps because of faulty memory locations. that is why the start address is 176o. We know this program is highly inefficient and much nicer written if you do understand what you are doing. But as it grew we don't like to toggle the whole program again. Hence the very ugly jumps and hacks.
0175 170176 *176 /LOCATE PROGRAM STARTING AT ADDR 200 0176 7300 CLA CLL /CLEAR ACCUMULATOR /CLEAR AC LINK 0177 7000 NOP // bad memory 0200 3273 DCA TMP1 /STORE THAT (0) IN TMP1 0201 7000 NOP // bad memory 0202 7000 MAIN, NOP 0203 1273 TAD TMP1 // load TMP1 0204 4223 JMS PRINTNUM // print dit nummer 0205 7300 CLA CLL 0206 1275 TAD SPACE 0207 4263 JMS TTYO // output to tty0 0210 4307 JMS LAAD // LOAD data field (change) 0211 4223 JMS PRINTNUM // print dit nummer 0212 1273 TAD TMP1 // load TMP1 0213 7001 IAC // INCREMENT 1 0214 3273 DCA TMP1 0215 1277 TAD CR 0216 4263 JMS TTYO // output to tty0 0217 7300 CLA CLL 0220 1276 TAD LF 0221 4263 JMS TTYO // output to tty0 0222 5202 JMP MAIN // tada.wav 0223 7000 PRINTNUM, NOP 0224 3274 DCA TMP3 // store this in tmp3 0225 1274 TAD TMP3 // get it. 0226 7010 RAR 0227 7012 RTR 0230 7012 RTR 0231 7012 RTR 0232 4302 JMS STUK 0233 7000 NOP 0234 7000 HEEL, NOP 0235 7300 CLA CLL // clear AC 0236 1274 TAD TMP3 // load TMP3 0237 7012 RTR 0240 7012 RTR 0241 7012 RTR // 6 bitwise shift 0242 4257 JMS PLUS // xor met 0070 0243 4263 JMS TTYO // output to tty0 0244 7300 CLA CLL // clear AC 0245 1274 TAD TMP3 // load TMP3 0246 7010 RAR 0247 7012 RTR // 3 bitwise shift 0250 4257 JMS PLUS // xor met 0070 0251 4263 JMS TTYO // output to tty0 0252 7300 CLA CLL // clear AC 0253 1274 TAD TMP3 // load TMP3 0254 4257 JMS PLUS // xor met 0070 0255 4263 JMS TTYO // output to tty0 0256 5623 JMP I PRINTNUM 0257 7000 PLUS, NOP 0260 0300 AND AND7 0261 1272 TAD PLUS60 0262 5657 JMP I PLUS 0263 7000 TTYO, NOP /TTY OUTPUT ROUTINE. THE FIRST WORD OF 0264 6446 6446 /WRITE AC TO THE OUTPUT DEVICE (TTY) 0265 6441 6441 /IF TTY IS READY, SKIP NEXT INSTRUCTION. 0266 5265 JMP .-1 /TTY IS NOT READY, SO CHECK AGAIN 0267 7200 CLA /CLEAR AC 0270 7000 NOP // Memory broken 0271 5663 JMP I TTYO /RETURN TO CALLER 0272 0060 PLUS60, 60 0273 0000 TMP1, 0 0274 0000 TMP3, 0 0275 0040 SPACE, 40 0276 0012 LF, 12 0277 0015 CR, 15 0300 0007 AND7, 7 0301 7000 NOP // Memory broken 0302 7000 STUK, NOP 0303 7012 RTR // 9 bitwise shift 0304 4257 JMS PLUS // xor met 0070 0305 4263 JMS TTYO // output to tty0 0306 5234 JMP HEEL 0307 7000 LAAD, NOP 0310 1273 TAD TMP1 0311 1001 TAD 1 0312 7450 SNA 0313 7402 HLT 0314 6211 6201 10 // CDF 10 0315 1673 TAD I TMP1 // indirect laden van TMP1 0316 6210 6210 0 // CDF 0 0317 5707 JMP I LAAD $
Rick Murphy version
Here's a dump program. It'll dump a field from (by default) location 0 to 7777. This is set up to dump field 1; change the CDF at location 206 to whatever field you want (CDF 20 is 6221; CDF 30 is 6231, etc.) Starting location is in PTR at 0221.
Note that OS/8 usually outputs ASCII with mark parity. That will confuse most modern systems. This code outputs with space parity. Tested on SIMH. Updates to avoid bad memory locations need to be made, of course.
0200 *200 //start address 000200 1221 LOOP, TAD PTR // Get the address 000201 4226 JMS PRINT // Print the address 000202 1222 TAD COLON // Output a space after the address 000203 4255 JMS TTYO 000204 1223 TAD SPACE 000205 4255 JMS TTYO 000206 6211 CDF 10 // Field 1 000207 1621 TAD I PTR // Get the value 000210 6201 CDF 0 // Restore field 000211 4226 JMS PRINT // Print it 000212 1224 TAD CR 000213 4255 JMS TTYO 000214 1225 TAD LF 000215 4255 JMS TTYO 000216 2221 ISZ PTR // Bump the pointer 000217 5200 JMP LOOP 000220 7402 HLT // Done 000221 0000 PTR, 0 // Start address 000222 0072 COLON, ": 000223 0040 SPACE, " 000224 0015 CR, 15 // Octal CR value[B 000225 0012 LF, 12 000226 0000 PRINT, .-. // Print a word 000227 3252 DCA SAVE // Word being printed - address or value 000230 1252 TAD SAVE 000231 7104 CLL RAL // Push one bit into the Link 000232 3252 DCA SAVE 000233 4240 JMS TTYNUM // Print one octal digit at a time 000234 4240 JMS TTYNUM 000235 4240 JMS TTYNUM 000236 4240 JMS TTYNUM 000237 5626 JMP I PRINT 000240 0000 TTYNUM, .-. 000241 1252 TAD SAVE 000242 7004 RAL 000243 7006 RTL // High order digit to low order word 000244 3252 DCA SAVE // Save state 000245 1252 TAD SAVE 000246 0253 AND SEVEN 000247 1254 TAD ZERO 000250 4255 JMS TTYO 000251 5640 JMP I TTYNUM 000252 0000 SAVE, 0 000253 0007 SEVEN, 7 000254 0060 ZERO, "0 000255 0000 TTYO, .-. 000256 6046 6046 000257 6041 6041 000260 5257 JMP .-1 000261 7200 CLA 000262 5655 JMP I TTYO