Page 2 of 4
Re: Lab-Volt 6502 Trainer - Looking for instructions
Posted: Thu May 11, 2017 1:39 am
by Nuxi
Any more info on this thing? I just came into possession of one... Memory maps, monitor routines, really anything I don't have to figure out from ROM dumps and schematics would be greatly appreciated!
Re: Lab-Volt 6502 Trainer - Looking for instructions
Posted: Thu May 11, 2017 1:41 am
by BigEd
Welcome Nuxi! Can you share photos of your new acquisition? (Is it in working order?)
Re: Lab-Volt 6502 Trainer - Looking for instructions
Posted: Thu May 11, 2017 4:02 am
by Nuxi
Sure, I can get around to pics at some point. Looks identical to the first posters, but with a robot controller daughter board (no robot, alas) and a combination storage cabinet/ power supply. Oh, and an EPROM in the user ROM socket.
Works great, but without knowing where anything is in memory, not much I can do with it. With 1k,though I'd love to try and port kim-1 microchess to it.
Re: Lab-Volt 6502 Trainer - Looking for instructions
Posted: Thu May 11, 2017 8:06 am
by BigEd
With luck, groinksan can help out, maybe with a scan of the booklet or a dump of the ROM...
Nuxi, do you have any way to dump the content of that EPROM? (For example, maybe a suitable 8-bit computer with a spare ROM socket, so you can peek it from Basic.)
With a dump of the EPROM, it should be pretty straightforward to figure out where everything is.
Re: Lab-Volt 6502 Trainer - Looking for instructions
Posted: Thu May 11, 2017 1:16 pm
by Nuxi
Only thing I have right now that could read the ROMs is the board itself (keep meaning to pick up an EPROM programmer, but there seems to be considerable disagreement on what modern ones are reliable).
I suppose I could just start executing best guesses (Martin threw out $3000, I can start there). If the monitor restarts, I'll know I've hit it, and can then read byte-at-a-time, and dump it into a disassembler.
The EPROM, I'm guessing has control routines for the robot arm, but I'll go ahead and dump it too, once I find it ...
Re: Lab-Volt 6502 Trainer - Looking for instructions
Posted: Thu May 11, 2017 1:18 pm
by BigEd
If you can peek using the front panel, then start by reading off the six bytes at the top of memory.
"On a RESET, the CPU loads the vector from $FFFC/$FFFD into the program counter and continues fetching instructions from there."
That starting point is certainly within the ROM, and relatively likely to be at the start of it.
Re: Lab-Volt 6502 Trainer - Looking for instructions
Posted: Thu May 11, 2017 4:01 pm
by Nuxi
Well, duh. Should've thought to look where the bootstrap procedure points to. Now to transcribe up to 2048 hex codes. Joy!
Re: Lab-Volt 6502 Trainer - Looking for instructions
Posted: Mon May 22, 2017 4:41 am
by Nuxi
Edit to fix typos
Ok, here's the first chunk (assuming no typos--I haven't actually looked at the disassembly yet). From the start of the monitor ($F319) to the interrupt ($F3A9). Incedentally, I've found the user ROM at $4000. No idea yet what it does (maybe waiting I/O operations that aren't hooked up). I may see what's at FF3B, F13C & F2B7 next.
hex:
Code: Select all
a2 ff 9a 86 cf e8 86 ce 86 df
a9 57 85 db 85 dd a9 f3 85 dc
85 de d8 58 a0 1f 20 5b f2 20
3c f1 20 b7 f2 4c 36 f3 a0 26
20 5b f2 a2 c3 20 df f1 20 8a
f1 85 df a9 00 a2 00 81 c9 4c
06 f3 86 cb 84 cc 85 cd 68 85
ce 68 85 d1 85 c9 68 85 d0 85
ca ba 86 cf a5 ce 29 10 f0 27
38 a5 d1 e9 02 85 d1 85 c9 a5
d0 e9 00 85 d0 85 ca a5 df f0
08 a2 00 86 df 81 c9 f0 0a e6
c9 e6 d1 d0 04 e6 ca e6 d0 20
b6 f1 4c 36 f3 6c d5 00 6c d7
00 6c db
disassembled:
Code: Select all
* = F319
F319 A2 FF LDX #$FF
F31B 9A TXS
F31C 86 CF STX $CF
F31E E8 INX
F31F 86 CE STX $CE
F321 86 DF STX $DF
F323 A9 57 LDA #$57
F325 85 DB STA $DB
F327 85 DD STA $DD
F329 A9 F3 LDA #$F3
F32B 85 DC STA $DC
F32D 85 DE STA $DE
F32F D8 CLD
F330 58 CLI
F331 A0 1F LDY #$1F
F333 20 5B F2 JSR $F25B
F336 20 3C F1 JSR $F13C
F339 20 B7 F2 JSR $F2B7
F33C 4C 36 F3 JMP $F336
F33F A0 26 LDY #$26
F341 20 5B F2 JSR $F25B
F344 A2 C3 LDX #$C3
F346 20 DF F1 JSR $F1DF
F349 20 8A F1 JSR $F18A
F34C 85 DF STA $DF
F34E A9 00 LDA #$00
F350 A2 00 LDX #$00
F352 81 C9 STA ($C9,X)
F354 4C 06 F3 JMP $F306
F357 86 CB STX $CB
F359 84 CC STY $CC
F35B 85 CD STA $CD
F35D 68 PLA
F35E 85 CE STA $CE
F360 68 PLA
F361 85 D1 STA $D1
F363 85 C9 STA $C9
F365 68 PLA
F366 85 D0 STA $D0
F368 85 CA STA $CA
F36A BA TSX
F36B 86 CF STX $CF
F36D A5 CE LDA $CE
F36F 29 10 AND #$10
F371 F0 27 BEQ $F39A
F373 38 SEC
F374 A5 D1 LDA $D1
F376 E9 02 SBC #$02
F378 85 D1 STA $D1
F37A 85 C9 STA $C9
F37C A5 D0 LDA $D0
F37E E9 00 SBC #$00
F380 85 D0 STA $D0
F382 85 CA STA $CA
F384 A5 DF LDA $DF
F386 F0 08 BEQ $F390
F388 A2 00 LDX #$00
F38A 86 DF STX $DF
F38C 81 C9 STA ($C9,X)
F38E F0 0A BEQ $F39A
F390 E6 C9 INC $C9
F392 E6 D1 INC $D1
F394 D0 04 BNE $F39A
F396 E6 CA INC $CA
F398 E6 D0 INC $D0
F39A 20 B6 F1 JSR $F1B6
F39D 46 36 F3 JMP $F336
F3A0 6C D5 00 JMP ($00D5)
F3A3 6C D7 00 JMP ($00D7)
F3A6 6C DB 00 JMP ($00DB)
F3A9 .END
Re: Lab-Volt 6502 Trainer - Looking for instructions
Posted: Mon May 22, 2017 6:50 am
by BigEd
Nice - that certainly starts off looking like cold-start initialisation code!
This is a bit unexpected:
Code: Select all
F336 20 3C F1 JSR $F13C
F339 20 B7 F2 JSR $F2B7
F33C 4C 36 F3 JMP $F336
It's surely worthwhile to go through checking for typos - if you can get a friend to call out values from the copy while you look at the originals, that can be pretty quick. (Or you could record yourself reading them out I suppose)
Re: Lab-Volt 6502 Trainer - Looking for instructions
Posted: Mon May 22, 2017 8:35 pm
by Nuxi
Nope, that's right. Fixed two near the end though. Reading these 8 segment LEDs is brutal. "b" vs "6" is next to impossible not to misread. I could just break down and buy something to read the ROMs, I suppose, but hey, the primitiveness of the set-up is half the fun.
Biggest priority is trying to figure out where the display routines are.
Re: Lab-Volt 6502 Trainer - Looking for instructions
Posted: Thu May 25, 2017 2:19 am
by Nuxi
So I haven't had a whole lot of time to play with this. But I've poked around (or, to be more accurate, peeked around), and firmly established:
$0000-03FF RAM
$E000-E??? User ROM
$F000-F??? ROM
It's a start. If, as I assume this:
Code: Select all
F336 20 3C F1 JSR $F13C
F339 20 B7 F2 JSR $F2B7
F33C 4C 36 F3 JMP $F336
is the main monitor loop, one subroutine might be keyboard input routine, the other the parser. Which I should be able to verify if I can find a jmp $E000 in there somewhere, reflecting the USR1 key. So I'll dump those sections next, I suppose.
Also, interestingly, standby mode is a true standby, not a soft off. It leaves RAM intact, which is quite nice.
Re: Lab-Volt 6502 Trainer - Looking for instructions
Posted: Wed Oct 10, 2018 3:55 am
by rootboy
Hi guys,
I stumbled across one of these trainers complete with the frame (case?) which includes the power supply. It came with four boards as seen in this post:
https://www.blackberryforums.com/parts/ ... 99305.html
I haven't found much documentation on it, other than what I found here. Also, I have a MCUMall GQ-4X which should read the ROM (I'll have to check for compatibility first). Are you guys still interested in a dump of the Monitor ROM? (and is that allowed here?)
Re: Lab-Volt 6502 Trainer - Looking for instructions
Posted: Tue Oct 16, 2018 4:27 am
by rootboy
Update: I did some researching and found this book:"Microprocessor Concepts and Applications" ISBN 0-86657-005-5, which covers the usage of the trainer, as well as having a hard copy of the Monitor in the appendix. However, it does not cover the add-on boards.
Re: Lab-Volt 6502 Trainer - Looking for instructions
Posted: Tue Oct 16, 2018 4:36 am
by Dr Jefyll
Apologies, rootboy! Our manners are found to be lacking!
No-one has acknowledged your post from last week, or your offer of providing a ROM dump. Yes, it's allowed to post that here. Thank you... and welcome!
Do you have photos of these add-on boards you mentioned? Although the book doesn't cover them, perhaps we can help infer the details, and maybe figure out how to get them working (assuming that's your goal).
cheers,
Jeff
Re: Lab-Volt 6502 Trainer - Looking for instructions
Posted: Tue Oct 16, 2018 8:55 am
by BigEd
I missed that first post too - welcome, rootboy!