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TI 99 - Hardware Identification needed

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Hi 99ers,

 

I have found a "strange" module, maybe somebody knows something about ?

 

Thanks for all infos

Ralf

 

post-41141-0-91380700-1425220712_thumb.jpg

post-41141-0-60061600-1425220719_thumb.jpg

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It looks like it is another variant of the Heiner Martin Supermodul board (at least it is using that board layout for its starting point). With that initial identification, it is a GRAM module. If you look at the side of the board that isn't visible, you should find two groups of stacked memory chips (one of five 8K chips and one of two (the stack of two may possibly have a third chip that is a loader ROM)). The switch is to write protect the cartridge.

 

Nice use of a pair of eraser (rubber, for you Europeans) halves too. . .

Edited by Ksarul
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Oh thanks a lot Ksarul,

I was a bit anxious to open the rest of the module, as the switch seems to "block" a bit.

But I will check that later.

Ralf

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You're right Jean Louis--the homebrew TI Calc cartridge board you show there is done on the same Heiner Martin circuit card, with it just set up to use ROM instead of RAM.

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have you the 2 Eproms from TI-Calc and can upload it, would like to test my Heiner Martin Module

 

61owy7myz8nx.jpg

 

179wkfx99mx.jpg

Edited by Flottmann1
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Note that the one in that TI-Calc picture has been modified for a 256K EPROM, as it needs four ROM banks.

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My Heiner Martin Module is not standard the eprom emulation grom is 27c256 no 27c128.

I have no dump of this eprom.

 

Jean louis

Edited by humeur
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I received the current issue of TIjdingen today. It had a notice in it that they recently found out that Heiner Martin had passed away on March 20, 2016 after a short but serious illness at the Uni-Klinikum in Ulm. Yet another of the folks who helped us get into the internals of the 99/4A is no longer with us. . .thanks to Beery Harmsen for the update!

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