fabrice montupet Posted January 19, 2020 Share Posted January 19, 2020 I found an Atmel 89C2051 in a TI-99 hardware lot I received some weeks ago, it was lying in a little box without document to identify it. The only information that I have is on the sticker on it : "MF2 V1.11 TABe V1.00". All that "MF2" inspires me is a the MF2 standard for PC keyboards, so maybe this IC is for a PC Keyboard adapter for the 99/4A. Not sure. But is this component really for TI-99 stuff? Someone can identify it? Thanks for any help! Quote Link to comment Share on other sites More sharing options...
atrax27407 Posted January 19, 2020 Share Posted January 19, 2020 Here's the datasheet: ATMEL 89C2051.pdf Quote Link to comment Share on other sites More sharing options...
CPUWIZ Posted January 19, 2020 Share Posted January 19, 2020 Here is an in-circuit programmer. https://www.pjrc.com/tech/8051/aicp-schematic.html Quote Link to comment Share on other sites More sharing options...
fabrice montupet Posted January 19, 2020 Author Share Posted January 19, 2020 Thank you for your answers. But I already have ( and read) the datasheet of the 89C2051 and no time to build a circuit to read the microcontroller. It is why I asked to you if, thanks to the sticker, you could identify it. Quote Link to comment Share on other sites More sharing options...
fabrice montupet Posted January 19, 2020 Author Share Posted January 19, 2020 ...I found it! It is the SGCPU keyboard microcontroller in charge of the PC AT keyboards ? 2 Quote Link to comment Share on other sites More sharing options...
+mizapf Posted January 19, 2020 Share Posted January 19, 2020 Can it be read out? It would be interesting for the SGCPU emulation which currently pretends to have a normal TI keyboard. Quote Link to comment Share on other sites More sharing options...
fabrice montupet Posted January 19, 2020 Author Share Posted January 19, 2020 Yes. As I have done for some other ROM, EPROM, PAL components in my possession, I will dump the 89C2051 to share it, I just have to find some free time to build a programmer/reader. For more quickly, the better way would be to buy one. 1 Quote Link to comment Share on other sites More sharing options...
kl99 Posted January 19, 2020 Share Posted January 19, 2020 nice. thanks Fabrice Quote Link to comment Share on other sites More sharing options...
fabrice montupet Posted January 19, 2020 Author Share Posted January 19, 2020 I just hope that the two lock bits haven't been programmed! Quote Link to comment Share on other sites More sharing options...
JB Posted January 19, 2020 Share Posted January 19, 2020 Fingers crossed you can dump it! Quote Link to comment Share on other sites More sharing options...
fabrice montupet Posted January 21, 2020 Author Share Posted January 21, 2020 Not good news ? Rummaging through my stuff, I found an old TOP853 programmer that I used some years ago, and I saw that it was abled to read the 89C2051. The chip was not copy protected but it is blank. So sad... Quote Link to comment Share on other sites More sharing options...
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