Home Page Forums MAME MAME TMS-09xx/1xxx thread (was New Dumps)

Sweet! After I get the '271 composited, I'll finish up Amaze-a-tron. I've got Maniac but haven't decapped it yet, Electronic Detective just arrived and Computer Perfection is on its way. I've got a list of 6 games that I'm looking for better deals on, and there are still a few interesting calculators (I had a TI-57, so that would be fun).

I put up a composite of the TMC0271NL pics that I've taken so far: http://www.seanriddle.com/speakandspell.html There's a 6000 pixel GIMP image at http://www.seanriddle.com/tmc0271nl.xcf
I'll re-shoot the output PLA above RAM and the instruction decoder PLA at top right with a higher magnification objective and post those. Any other areas?
I dumped the '351 and '352 from the other S&S and the contents are identical to the other unit's chips.

I put up some higher magnification pics: http://www.seanriddle.com/tmc0271nlopla.xcf, http://www.seanriddle.com/tmc0271nlinstpla.xcf,
http://www.seanriddle.com/tmc0271nlromdec.xcf.
Let me know if you need any other areas.

Not for me, I only needed the output PLA myself. Thanks! =)
I double checked instpla, and it's same as the TI30 0980 one, as expected.

The TI-57 and others of the same series, interesting indeed. I wonder what TMS1500 specs are, I see it differs a lot from default TMS1000 according to datamath.org.

siliconpr0n comes through again- http://siliconpr0n.org/map/ti/tmc1501nc/

Looks like 16-bit wide ROM and different RAM from TMS1x00- I believe TI-57 kept RAM contents when off. It just looks like 256 bytes. What's in the upper right- registers, or separate program memory (or both)? TI-57 had 8 memories and could hold 50 programming steps.

I'll probably still pick one up to get pics with the top metal layer removed.

Also, I opened the Maniac case, and instead of a TMS-1x00, there's a GI PIC1655A! I haven't decapped one of those before. The current PICs make ROM extraction difficult, but this one is so old I bet it can be visually dumped.

The memory map of the ti-57: http://www.rskey.org/CMS/index.php/the-library/100

The memory is volatile. It's the ti-57 lcd that had non-volatile memory, and it was a very different beast. In particular you had to partition between program steps and memory registers.

I actually dump VSMs using a TMS5200 and TMS51XX setup, so they take care of the dummy reads, maybe its why I didn't see those.
Note the TMS6125 are little more fiddly to dump

Thanks! The patent Claus references, 4125901, shows 13-bit ROM, but it sure looks like 16-bit to me.

It's been so long ago that I can't remember, but I can't believe that I had to re-enter programs every time I powered off the TI-57! The calculator itself disappeared somewhere along the way, but I found the manual.

Using the '5200 and '51XX, you don't have to level-shift either, do you? I first thought about using a couple of 4066s, since I have lots of those and didn't need a lot of speed. But then I remembered that it takes VDD-1 volts to turn the 4066 switches on, and my PIC couldn't get there. I dug around and found one 4504, so I simplified the circuit to use fewer than 6 IOs. I wound up just using 3, so I could have just used 3 transistors, but this works.

I had the Vowel Power module apart to dump it, and I goofed up and plugged it into the S&S incorrectly and it looks like I fried it. It now drives ADD8 high after initialization, but then it's low for every bit. I'm not sure if I plugged it in upside down (the module's connector only has pins on one side, but the PCB has pins on both) or if I offset it one pin left or right (the PCB has more pins than the module, and the module case has protrusions that align it correctly). I was going to keep it, but now it gets the blowtorch.