TI99/4A on FPGA: new core with CPU VHDL code

Discursiones en general sobre el proyecto que no tienen cabida en otro foro / General discussion for uncateorized topics about the ZX-Uno project
weirdocollector
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TI99/4A on FPGA: new core with CPU VHDL code

Mensajepor weirdocollector » 20 Feb 2018, 11:57

The author of a previous hack that combined a physical TMS99105 CPU and an FPGA to create a clone of the TI99/4A, has now created another version (soft-cpu branch) which includes the TMS9900 CPU core written in VHDL.

https://github.com/Speccery/EP994A/tree/soft-cpu

Would it be possible to port this to the ZX-UNO ?

Thanks!
Última edición por weirdocollector el 20 Feb 2018, 20:21, editado 1 vez en total.

azesmbog
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Registrado: 17 Feb 2016, 23:07

Re: TI99/4A on FPGA: new core with CPU VHDL code

Mensajepor azesmbog » 20 Feb 2018, 13:48

Интересный проект, попробовать то можно, НО!
похоже это для этой devboard
http://saanlima.com/store/index.php?rou ... duct_id=64
и похоже доступ к памяти 16-bit, и памяти 1Mb
если конечно тут это задействовано - то проблематично. imho

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mcleod_ideafix
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Re: TI99/4A on FPGA: new core with CPU VHDL code

Mensajepor mcleod_ideafix » 22 Feb 2018, 15:15

weirdocollector escribió:The author of a previous hack that combined a physical TMS99105 CPU and an FPGA to create a clone of the TI99/4A, has now created another version (soft-cpu branch) which includes the TMS9900 CPU core written in VHDL.

https://github.com/Speccery/EP994A/tree/soft-cpu

Would it be possible to port this to the ZX-UNO ?

Thanks!


If it is possible, probably, Quest or Jepalza (to name two of the people I know they like to do these things) will put their hands on it :) I wish I could involve on this, but my FPGA-time is already full :cry:
http://www.zxuno.com
ZX-Uno · Clon de ordenador ZX Spectrum basado en FPGA

azesmbog
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Registrado: 17 Feb 2016, 23:07

Re: TI99/4A on FPGA: new core with CPU VHDL code

Mensajepor azesmbog » 22 Feb 2018, 16:36

шина ДАННЫХ - 32-bit, из нее делается 16-bit
первые 512kB - под картридж, вторые 512 - подо все остальное
клавиатуры PS\2 - нет
клавиатура сделана матрицей на порту расширения
загрузка с SPI-флеш. Хорошо если не с нулевого адреса:)
ну и RX\TX .
Интересный компьютер


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