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Ok, it is working in MESS. The keypad row pins are the same internal output bits as the O-pins.
1 small emulation problem though, probably due to another unknown difference in the MCU: the equals sign (aka O-pin 7) is always on.

The 1976 TMS0970 version would still be interesting to acquire, to see the differences in the code.

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That's interesting about the keypad rows. At those quantities, the cost savings on a simpler PCB must have justified the redesign.

Good news/bad news- I got the 1976 version, but some plastic stuck to the die: http://www.seanriddle.com/0970.html

I'll try to clean it off without damaging the bits below. I transcribed as much as I could. I see lots of similarities, but lots of differences.

The die from Entex Space Invaders also stuck to the plastic, and it took a lot of heat to get it free. The passivation layer crackled and obscured the die, which I've seen before. But previously I could still remove the metal layer with Whink and transcribe the bits. This time, Whink isn't working. So I guess the heat cooked the passivation layer enough that mild HF isn't able to dissolve it. I'll try some other acid.

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Kevin- Are you putting VDD on the Rockwell MM78 test pin, or a different voltage? I got an MM75 as well as the MM76EL, and I'm not getting anything from either of them. I've tried several different voltages on VDD and the test pin.

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Aww, good luck on round 2 with those dies(dice?).

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I've heard it both ways. I think dice is preferred.

I got Super Simon (MP3476NLL 4050 WE 8022 PHILIPPINES) and Entex Baseball 2 (MP0923 G70019 MS ^ 7923). Both 28-pin SDIPs. Probably 1100 for the Simon and 1000 for BB2?

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Originally Posted By seanriddle
I've heard it both ways. I think dice is preferred.


I use "dice" when talking about 6-sided or 20-sided used for playing board games and roleplaying games.

I use "dies" when talking about silicon chip cores embedded within ceramic (or whatever).

Maybe I'd be wrong, dunno...

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See the top comments section for a list of known serials: http://git.redump.net/mame/tree/src/mess/drivers/hh_tms1k.c

Yes, it's very likely that S.Simon has a TMS1100 and BB2 a TMS1000.

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I've got a couple more chips here that I've either not gotten to, or they are broken.

Science Fair (Radio Shack) Microcomputer Trainer - MP1312 MAS^8414 (chipped die, part of ROM damaged)

Kosmos Astro astrological thingy - TMS1400NL MP7314-N2 W 8027 PHILLIPINES (the die is labelled MP1133) (new, some plastic stuck on die)

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Hah, that thing looks awesome laugh https://www.youtube.com/watch?v=r6rJWwbNM6k

Kosmos Astro: MP1133 sounds like TMS1100, and the label is a fab error? TMS1400NL MP7314-N2 is Parker Bros SplitSecond!

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I don't understand the die marking on the Astro, but I just double-checked the die shot and it's definitely a TMS1400 labeled MP1133.

Let me check my notes and pictures on the package labeling. I might have confused the 2 chips.

Edit: That's what I get for scribbling notes on slips of paper. The Astro chip package is labeled
TMS1470NLHL
MP1133
ML 7936
SINGAPORE

But the die says TMS1400. I haven't assembled a full die shot from the tiles yet, but it looks like a TMS1400. And the PCB has a bunch of transistors, so maybe they used a 1400 instead of a 1470?

I put up a quick composite of the Astro die: www.seanriddle.com/astrometal.jpg

I expected that the outputs would look different if it were a TMS1470 with VFD outputs, but it looks the same as the LED version. But the code number at the bottom of the die starts out 28H, whereas the other 4 TMS1400s start out 28L. I assume that means 28 pins, high or low voltage.

Last edited by seanriddle; 03/17/15 12:27 AM. Reason: astro die shot
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