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I got the stronger HN03 Monday afternoon and used it on several dies. It helped with most of them, including Little Professor 76. I still need to Whink the dies again since the plastic protected the passivation and top metal layers, but I can see the bits under the metal layer. I updated the raw and execution order dumps: http://www.seanriddle.com/0970.html

I'll try to Whink that one as early as possible tomorrow and double-check the dumps.

Last edited by seanriddle; 03/24/15 08:07 AM.
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I verified the Little Professor 76 dump and uploaded a new ROM array picture.

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had to check wiki.. http://en.wikipedia.org/w/index.php?title=Nitric_acid
Great that it works on the pesky plastic smile

I will add it to MESS when you finished the full-die shot without glob, since pieces of the PLAs were obscured as well.

Can you also remove the smudge from the TMC1990 version? A small section of the instruction PLA was obscured.

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I've added Little Professor (1976 version), it works but I marked the PLA files as possible bad dump.

The main opcode PLA and output PLA are probably ok.
The microinstructions PLA(sans glob) matches the one from TI1270 so I used that.

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Dark Tower added and working. I'll do Super Simon after the new MESS release.

http://git.redump.net/mame/tree/src/mess/drivers/mbdtower.c

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Cool! I posted the full Little Professor 76 die shot. I didn't clean the TMC1990 in HNO3 this time, but I'll do it next time.

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If you aren't bored with TI calcs, one of the dies that I cleaned was for SR-16 II, using a TMS-1000: www.seanriddle.com/tms1000.html

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Of course I'm not, this is where it all started. =)
Do you still have the SR16? I don't know the R/C values, and I'd also like to know if the special case digit3/12 wiring is the same as the one you documented in SR16-II.

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SR16 has a 43K resistor to VDD and 68pF cap to VSS.

I can't find any info on the display driver ICs used- they are labeled ITT 506-5N. I'm guessing they are equivalent to 75493 or 75494, but I'm not sure. So that makes tracing everything a little more difficult.

By connecting power to the LED board pins, it does look similar- digit 12 segment B actually lights up digit 3 segment G. I could not get digit 12 segment C or DP to light up, nor any other segments on digit 3. The other digits have all the segments, except digits 1 and 2 don't have DP.

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Milton Bradley Plus One has an 8-pin DIP marked with National Semi's logo and /029 MM 57405N. 2 pins are power and ground, 4 are inputs from the orientation sensor, one is an output to a piezo, and one is connected to a resistor to power and a cap to ground, so oscillator? I'm not sure if this is a microcontroller in a smaller package, or an ASIC like Simon.

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