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killbot2000

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Posts posted by killbot2000

  11. Posted

     

    To produce a 'One-Chip' TMS9900 system or System-On-a Chip , you'd need to prototype your code on a FPGA board something like an Altera DE0 or similar combining all the separate VHDL code into a working and tested system. This would take some time, but if a reasonable amount of the code is already written then it shouldn’t be too difficult.

     

    As a lot of code is already out there .. video (TMS9918,V9938??) sound Chips, CPUs , TMS9995? keyboard decoders, memory mappers etc then a lot of the work has already been done reducing the timescale considerably !

  12. Posted

    Several months ago I was discussing the possibility of producing a TMS9900 system, in VHDL, with a small business in the US. They said they had TMS99xx cores in VHDL and a TMS9995 core and could do bespoke designs..obviously for money. Never got to the stage of getting a quote. But it does prove that it is possible to make/build a TMS99xx on a chip.. the tools and equipment are out there !

     

    I've lost their email address !... and can't remember the name ! I suppose you could try Googling TMS9995 VHDL ??

  13. Posted

    I don't think the chap who done the PCB is interested in selling them, but I can probably get the files and have a small run made. Price is around $25 per PCB plus postage. I'll try to get some more details and post them here.

    Hi.

     

    is there any pics of a finished / assembled unit ?? Do they have any sort of expansion to add video card etc

  14. Posted

    A batch of blank Cortex PCBs came up on eBay a few years ago but they all got snapped up. The Cortex schematics are available (www.powertrancortex.com) as well as decent photos of both sides of a blank PCB, so remanufacture is perfectly possible but you'll have to lay everything out. They're quite big PCBs as well so will be relatively pricey.

     

    I've got a design for a simple TMS9995 system (http://www.avjd51.dsl.pipex.com/tms9995_breadboard/tms9995_breadboard.htm) and there's a chap in Australia who has had a PCB for that manufactured, if that is of interest?

    The Simple TMS9995 PCB really sounds interesting ... where can you get one and how much are they ?

  18. Posted

    The idea was to design a professional (low cost) V9990 board that would plug into a Motherboard. A test Homebrew TMS9995 or TMS99105 motherboard would be used to evaluate the V9990 Video bard.

     

    The V9990 board would need to cost less than $50 ?? Though this my be difficult. The video board would be generic so it could be used with Z80 / MSX motherboard or any general microprocessor or microcontroller. This would give it greater appeal than the TMS99xx / Ti-99/4A market. and thus make it much more popular.

     

    Any ideas are much appreciated.

  19. Posted

    The idea was to build a Generic V9990 board that could plug into a homebrew TMS9995 / TMS99105 Motherboard. Being Generic it would appeal to anyone wanting a 'Respectable' video board for their own homebrew projects. As the V9990s are still readily available for about $20 the board shouldn't be too expensive to produce. The big problem is using surface mount components.

     

    Any old schematics etc would be much appreciated.

     

    Thanks

  20. Posted

    Hi.

     

    I'm looking at desiging a V9990 Board... something like the MSX GFX9000 ?? The idea is to design a small yet powerful Video PCB that could plug into a homebrew video card giving V9990 graphics to a VGA monitor ! The Video card would be 'Generic' allowing DIY/Homebrew builders vto use it in their own projects.

     

    Does anyone know which DRAMs are compatible with the V9990 .. ideally with full part numbers so I can check if they are still available. Also What ROM is compatible with the V9990 ??

     

     

    ** Plus

     

    Which RAM/RAM goes with the YMF278B OPL4 PSG ??

     

     

    Where can I find V9990 VDP Board schematics ??

     

    Any help is much appreciated..

     

     

     

     

    Thanks

     

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