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Manawyrm's profile
Manawyrm
Manawyrm
Manawyrm
@Manawyrm

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Manawyrm

@Manawyrm

Electronics, Networking (AS203478), Ham radio (DL4TMA), er/he 🏳️‍🌈

Alfeld (Leine),  🇪🇺
tbspace.de
Joined February 2010

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    1. Manawyrm‏ @Manawyrm Sep 6

      My Arduino code: https://github.com/Manawyrm/ISAMega/blob/master/src/main.cpp … x86-Emulator / VGA-BIOS Emulator: https://github.com/Manawyrm/ISAMega-x86Emuator … If anyone wants to take a look at the emulation...pic.twitter.com/tUwpEiwoUz

      1 reply 1 retweet 20 likes
      Show this thread
    2. foone‏ @Foone Sep 6
      Replying to @Manawyrm

      This is very cool, and I look forward to messing with it! I played around with a commercial product to do this, and it was a bit of a disappointment: really noisy power supply and all the frequencies were wrong, so no CGA, and the same VGA-init problems you ran into.

      1 reply 0 retweets 1 like
    3. foone‏ @Foone Sep 6
      Replying to @Foone @Manawyrm

      foone Retweeted foone

      so I'm definitely interested in a solution that can be modified to work properly with things like CGA cards! My thread (using the ARS Tech ISA2USB) is here:https://twitter.com/Foone/status/1228127962320404480 …

      foone added,

      foone @Foone
      After lots of testing and yelling at different software and OSes, I finally have an ISA card working over USB! Next step: CGA card or Adlib... pic.twitter.com/M4dto8wzLE
      Show this thread
      1 reply 1 retweet 2 likes
    4. Manawyrm‏ @Manawyrm Sep 6
      Replying to @Foone

      Very nice! I'm pretty sure CGA would already work well. The clocks are absolutely correct on mine and the +5V and +12V PSUs are perfectly clean. The -5V and -12V are a bit weak (max 1W combined), but work.pic.twitter.com/OLhTNaAB2I

      1 reply 0 retweets 0 likes
    5. Manawyrm‏ @Manawyrm Sep 6
      Replying to @Manawyrm @Foone

      I don't have any CGA cards or monitors, though, so I can test that :( Do you have more experience with the VGA already? How did you try to emulate the BIOS?

      1 reply 0 retweets 0 likes
    6. foone‏ @Foone Sep 6
      Replying to @Manawyrm

      I've only a little bit of experience with VGA cards in the past. I was working on modifying my own x86 emulation tool to handle it, but it turned out the VGA BIOS I was looking at using required a lot of instructions that I didn't yet support, so I didn't get far

      1 reply 0 retweets 1 like
    7. foone‏ @Foone Sep 6
      Replying to @Foone @Manawyrm

      plus the ISA2USB was having weird issues where I couldn't get it to consistently connect, so I basically gave up out of frustration at that point

      1 reply 0 retweets 1 like
    8. Manawyrm‏ @Manawyrm Sep 6
      Replying to @Foone

      I think I'll design a PCB for assembly at JLCPCB, that way it's easy to just order these boards (total cost for 2 boards will hopefully be under 50$)

      1 reply 0 retweets 1 like
    9. foone‏ @Foone Sep 6
      Replying to @Manawyrm

      Cool! I look forward to seeing it

      2 replies 0 retweets 0 likes
    10. Manawyrm‏ @Manawyrm Sep 23
      Replying to @Foone

      Manawyrm Retweeted Toble_Miner | tsys

      https://twitter.com/Toble_Miner/status/1308671279394959361 … @Toble_Miner was so nice to layout the board for this prototype. It has some special design choices: onboard SDRAM, card instead of sockets, 8bit ISA only (for now) but it does have USB 2.0 and with 400 MHz hopefully more than enough power.

      Manawyrm added,

      Toble_Miner | tsys @Toble_Miner
      Spent yesterday morning routing an ISA card with a STM32H7 and some SDRAM for @Manawyrm Now we can run an x86 emulator with a real ISA bus on ARM and attach an ISA bus to a PC via USB. pic.twitter.com/KIVcBMArYb
      2 replies 0 retweets 0 likes
      Manawyrm‏ @Manawyrm Sep 23
      Replying to @Manawyrm @Foone @Toble_Miner

      Benefits of doing it as an 8bit card: - 4 layer PCBs within 10x10cm are much cheaper (16bit doesnt fit in 10cm) - ISA sockets are expensive (~4$/pcs), I can mount 5pcs on a backplane and then just swap the card - Power supply (-5,5,12,-12) can be done by the backplane

      12:42 AM - 23 Sep 2020
      0 replies 0 retweets 0 likes

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