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Thread: Boards and parts for Grant Searle Multicomp

  1. #1
    Join Date
    Mar 2012
    Location
    Augusta, Georgia, USA
    Posts
    636

    Default Boards and parts for Grant Searle Multicomp

    Hello all,

    I recently built one of these expansion boards so that I could run CP/M via Grant Searle's Multicomp project.

    As usual with these kinds of things, I ended up with many extra boards and parts and wondered if anyone else wanted to build one.

    I have 9 boards left, and probably enough parts to make one more complete one, with SRAM and all parts.
    A complete assembled and tested board would probably be around $40 + shipping.

    A complete assembled and tested board (without SRAM chip) would probably be around $30 + shipping.
    I can source some more parts, but that will take a few weeks. Let me know if you want to do that and I take preorders for more complete tested boards.

    Bare boards are $5 + shipping for whatever is left.

    NOTE: With any of these options, you will still need to source your own Cyclone II FPGA board to plug in, a USB Blaster to program it, and a micro SD card, which together are around $25-30.

    It runs fine at 25MHz, which is a blisteringly fast CP/M machine using composite or VGA and a PS/2 keyboard, or just over serial port. The board will take 4 serial ports, normal or BT, but I only populate one of them. You can add resistors and pins to populate the other 3. Also, I didn't populate the LEDs either, but you could add them if you want visual blinkenlights.

    20180521_212725.jpg

    Note that in the photo I have an LDO (3.3v regulator) on there, but it's not needed. Everything already runs on 3.3v and I just power it from the Cyclone AC adapter. It's possible you might have a PS2 keyboard that needs 5v, or a VGA monitor that expects that for signal detection, but mine run fine at 3.3v.

    BTW, here is the Cyclone II board that is needed for this project: https://www.ebay.com/itm/222882868419
    It's even less now- $18 including the programmer and cables!

    You can do more with these boards- many people have expanded on Grant's work. I think you can now run OS/9 on a 6809, and also some other 6502-based machines.
    Last edited by rittwage; May 22nd, 2018 at 04:00 PM.

  2. #2
    Join Date
    Mar 2012
    Location
    Augusta, Georgia, USA
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    Default

    Wow! I am amazed at the response. I am out of spare parts!

    I am short SRAM chips, keyboard, and VGA connectors. If you want one without those, I can still ship them out- PM me for price. Otherwise it will be a few weeks to get more parts in...

    All the projects can still be built for just composite or serial IO. You do need the 128K SRAM for CP/M, though.

  3. #3
    Join Date
    Mar 2012
    Location
    Augusta, Georgia, USA
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    Default

    Hello,

    I have 3 more complete sets of these for anyone interested. This includes everything you need except the FPGA board+blaster+SDcard already soldered up, tested and ready to go.

  4. #4
    Join Date
    Mar 2012
    Location
    Augusta, Georgia, USA
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    Default

    One more is left. I can sell pre-built for $40+ship or unassembled parts for $25+ship.

  5. #5
    Join Date
    May 2017
    Location
    Finger Lakes, NY, USA
    Posts
    36

    Default

    Quote Originally Posted by rittwage View Post
    One more is left. I can sell pre-built for $40+ship or unassembled parts for $25+ship.
    I've just PMd and am hoping I'm not too late.

  6. #6
    Join Date
    Mar 2012
    Location
    Augusta, Georgia, USA
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    Not too late, it's packed up and will go out tomorrow.

    And I know I keep saying it, but I scrounged enough parts for *1* more complete unit, for real this time. Let me know... (assembled or not, your choice)

    After that, I am out of the everything except boards and the sockets since I got higher quantities of them (VGA, composite, and PS2 sockets).

    Oh, and since someone asked- this is the compact version of the Cyclone-IIc board from RetroBrewComputers.com. The SRAM was moved very close to the FPGA so they would run at higher speed. It's no problem reaching 25MHz on this board.

  7. #7
    Join Date
    May 2017
    Location
    Finger Lakes, NY, USA
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    The Cyclone-IIC multicomp project pages are at https://www.retrobrewcomputers.org/d...loneii-c:start and the RetroBrew forums are at https://www.retrobrewcomputers.org/f...hread&frm_id=1 .

  8. #8
    Join Date
    Mar 2012
    Location
    Augusta, Georgia, USA
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    Yes, thanks. Specifically, this board here is the one I have: https://www.retrobrewcomputers.org/f...h=111&start=0&

    I have only a few boards left now. $5.50 including shipping in the USA (envelope only, I will pad it as best I can within an envelope).

    Here are some pictures of the board when built with the parts I provide (or built for you).
    https://c64preservation.com/files/multicomp/

    Also in that folder is the Microcomputer.VHD file I had- it is for CP/M 2.2.

    I write the demo disk here for testing to SD card with win32diskimager:
    http://obsolescence.wixsite.com/obso...-cpm-demo-disk

    I left it bare minimum parts to get you up and running. You don't need the 5V bridge, it works as Grant designed it from the 3.3v provided from the Cyclone board. Some keyboards may not like it, mine had no problem.

  9. #9
    Join Date
    Mar 2012
    Location
    Augusta, Georgia, USA
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    Does anyone have any more interest in these? I do have a few boards left, as well as miscellaneous parts to build kits.

    The Cyclone II boards are even cheaper now, and I can order some SRAMs and have some complete kits fairly quickly.

    If you upgrade your SRAM to the 512Kx8 module you can run the newer setup that has several other different Z80 OS's to choose from:
    CP/M 2.2, Dos+ 2.5, CP/M 3.0, MPMII 2.1, ZSDOS 1.1/ZCPR2, ZPM3/ZCCP and NASCOM ROM Basic
    https://www.retrobrewcomputers.org/d...tar:mc-2g-1024

  10. #10
    Join Date
    Jun 2009
    Location
    Placitas, NM
    Posts
    150

    Default

    Quote Originally Posted by rittwage View Post
    Does anyone have any more interest in these? I do have a few boards left, as well as miscellaneous parts to build kits.

    The Cyclone II boards are even cheaper now, and I can order some SRAMs and have some complete kits fairly quickly.
    Yes, I'm interested. (i.e. check your VCFed mail)

    <*> Jim

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