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| Re: New TI Project [message #10164 is a reply to message #10161] |
Sun, 20 November 2022 12:22   |
alkmar
Messages: 29
Registered: August 2019
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Junior Member |
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Very nice, are you going to considering selling or open source the boards once you have the system where you want it?
I always liked the TMS9900 processor, if only TI didn't cheap out on the bus (using a 16-8 converter), and putting almost all of the RAM on the VDP (if I remember correctly the only RAM connected to the CPU was 256 Bytes @ >8000 or so). It would have been a very capable machine back in 1979-1984 without wait states and more RAM connected to the CPU.
I think the TMS9905 has a cool aventage of registered on die which would keep the speed up, but I really did like using BLWP for assembly subroutines, you never had to worry about overwriting other registers (except for R11, which kept the return address and register pointers)
Thanks for showing the project!
PS: Tunnels of Doom anyone  to relax after writing code in the Editor and Assembler...
[Updated on: Mon, 21 November 2022 22:45] Report message to a moderator |
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| Re: New TI Project [message #10168 is a reply to message #10164] |
Mon, 28 November 2022 15:49 |
danwerner
Messages: 50
Registered: October 2015
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Member |
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All of my work on this project is open source, and available here: https://github.com/danwerner21/TI99_22
To get PCBs, just download the latest version of the gerber ZIP package and use your favorite manufacturer. The latest iteration of the boards should be stable (building them tonight to test). I do need to add a bit more documentation, but other than that the boards are done. I am working with another builder to design a 3d printed case, then I believe this incarnation is complete.
I am considering creating another version designed to fit in an ATX case with TI PEB slots, as well as creating PCBs for the floppy controller and a PEB version of the TI speech synth . . . but at the moment those are just ideas.
Dan
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