Originally Posted by seanriddle
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.

Can you do a high-res image of the remaining portion of the tmc0271 rom? about 80% of it is still readable, and could be useful to compare against the patent firmware (which i suspect matches the 'bug fixed' 1979 one, hence we need this older rom on the chip).

Also, can you image the 4 rom areas of the tmc0281? It is an older '0280 A / 281' chip, while the tms5100 on siliconpr0n is '0280 B / 281 A' which is newer.
https://dl.dropboxusercontent.com/u...mage%20on%20the%205220%20die%20small.png shows the rom areas on a tms5200, but the 5100/0281 has the rom areas in question in (nearly) the same places on the die. (ignore the copyright area, its in the upper right on the 5100/0281 and i can see it in your low res image just fine)


Last edited by Lord Nightmare; 12/21/14 04:16 AM. Reason: we still do need the rom area of the damaged 0271 imaged

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