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Thread: Some progress for FreHD on model 2

  1. Default Some progress for FreHD on model 2

    Hi folks.

    Wanted to share some progress. I have hacked mame to support FreHD on the model 2, so I can understand what's going on (since my model 2 has a broken floppy disk and no hd interface card). FreHD will require a little mod and a new GAL to work on the model 2, Hans and I are working on it.

    Long term, I plan to make a model 2 board with 512K ram, 512K flash, and a FreHD v2 (based on a PIC32 + big CPLD to implement some required logic (CTC and DMA support)). Maybe memory for 68K ? We'll see...

    -Fred
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  2. #2
    Join Date
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    Hooray! That's great work Fred
    *There is never a charge for Tech Support even if you don't purchase from me - We are Enthusiasts Helping Other Enthusiast and that is just the way it is

  3. Default

    Quote Originally Posted by TRS-Ian View Post
    Hooray! That's great work Fred
    Yes, you helped indirectly. I got the schematics from Pascal who also helped, which he could do with the board you sent him a while ago Team work !

  4. #4

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    Great news! Do you expect the modified units to become incompatible with the Model III/4? I think I should order another FreHD from Ian with plans to modify it later, and make sure I have the right GALs in my parts bin.

  5. #5

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    Great! Looking forward to the finished mod.

  6. Default

    Quote Originally Posted by NF6X View Post
    Great news! Do you expect the modified units to become incompatible with the Model III/4? I think I should order another FreHD from Ian with plans to modify it later, and make sure I have the right GALs in my parts bin.
    Yes, the GAL has to be different because address 0xC2-0xC7 cannot be used. FreHD, on a model III/4, uses these to give extra functionality. On the model 2, these addresses are used by the CRC (C4-C7). C2-C3 are "id registers", but I haven't seen code accessing them yet. I also haven't seen any DMA done with TRSDOS 4.0, but I have just barely tested it on the emulator. I'd be nice to boot cp/m and later xenix but if I design a board, there will be enough space on the CPLD to accommodate DMA.

    -Fred

  7. #7

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    Any chance you could put an Ethernet or WiFi module on the board? I know it’s a big ask but there are a lot of uses for Network connectivity.

  8. #8
    Join Date
    Jan 2011
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    The MISE/M3SE uses a WIZ830MJ ethernet module, I believe: http://www.mouser.com/ds/2/443/WIZ830MJ-268477.pdf

    In his spare time, Pete C. could readily write the programs necessary to use it.

    Mike
    Last edited by MikeModifed; July 8th, 2018 at 02:18 PM. Reason: Differentiating between Petes. ;)

  9. #9
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    Fantastic new guys - it's just getting better and better

  10. #10
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    Mar 2016
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    Pikesville, Maryland
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    Quote Originally Posted by veco View Post
    hi folks.

    Wanted to share some progress. I have hacked mame to support frehd on the model 2, so i can understand what's going on (since my model 2 has a broken floppy disk and no hd interface card). Frehd will require a little mod and a new gal to work on the model 2, hans and i are working on it.

    Long term, i plan to make a model 2 board with 512k ram, 512k flash, and a frehd v2 (based on a pic32 + big cpld to implement some required logic (ctc and dma support)). Maybe memory for 68k ? We'll see...

    -fred
    this is proof that the trs 80 is somehow still a machine of viable interest to people out there - so try and attend tandy assembly 2018 to help keep the trs alive !!!!!!!!!

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