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Speccery / icy99

TI-99/4A FPGA implementation for the Icestorm toolchain
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Add HEXBUS PHY #4

Open emard opened 4 years ago

emard commented 4 years ago

There's a 4-bit PHY bus interface chip for HEXBUS, make a simple functional reimplementation of this so that CPU fhings there's a chip like this

DSR HEXBUS ROM image is here

https://atariage.com/forums/topic/306514-hexbus-jedimatt-compatible-sidecar/?tab=comments#comment-4531708

DSR HEXBUS ROM dissasembly is here to help making PHY

https://atariage.com/forums/topic/306514-hexbus-jedimatt-compatible-sidecar/?tab=comments#comment-4569046

Pictures of HEXBUS TI99/4A hardware is here https://www.hexbus.com/TI-99_4A_Home_Computer_Page/Rare_Hexbus_Perhipherals.html

PHY is 22-pin DIL chip labeled 1052911-X Possible dataheet of this chip or a very similar one may be here, together with HEXBUS signaling waveforms described

http://ftp.whtech.com/hexbus_cc40_ti74/Hexbus%20Specification.pdf

Speccery commented 1 year ago

Thanks for this material, I will take a look at this. I have a TI-74 which has hexes connectivity.