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Bunsen

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  1. If you want to max out the transfer speed on that 5MB/s SCSI bus, the v6 SCSI2SD would do that for you. https://store.inertialcomputing.com/SCSI2SD-v6-p/scsi2sd-v6-revf.htm
  2. Bunsen

    Fun with colour on my SE/30

    No, no I had not. I've never seen any driver board that cheap, let alone a configurable one. Unfortunately it appears to only support a number of common (ie, modern) resolutions. I'm looking for something I can assign arbitrary resolutions and scan rates, and other timing details.
  3. Bunsen

    Fun with colour on my SE/30

    It'll fit the front bezel, but the neck is a couple of inches too long for the case and would stick out the back.
  4. Bunsen

    Fun with colour on my SE/30

    The earlier iPad displays do 1024x768 (XGA), which is exactly pixel-double the old Mac 512x342, and will work off cheap ebay driver boards. And the iPad Mini version, at 7.9" diagonal, would fit neatly in the bezel. You can pick up a kit with the driver board and panel for not too many dollars. 10.4" and smaller XGA LCDs were also used in a few laptops, Panasonic Toughbooks for example.
  5. Bunsen

    Fun with colour on my SE/30

    Ooh. What else can you change in this hidden menu? A board that can be arbitrarily reconfigured to run oddball displays would be hugely useful to me.
  6. Bunsen

    Ethernet via SCSI2SD V6

    On that note, the obvious way around the issues associated with bitbanging the SCSI bus is to think like the Tiny SCSI Emulator, and use an actual SCSI PHY. They're still floating around in the usual NOS back-channels, including much faster ones than the original 5380. Unfortunately David Kuder seems to have abandoned work on TSE, and the successor project shows no work since announcement.
  7. Bunsen

    Ethernet via SCSI2SD V6

    IMO, that idea of dedicating a core to bitbanging might make RaSCSI faster (assuming a multicore Pi-like). There's a baremetal version of RaSCSI for the $5 Pi Zero, which provides storage emulation (SCSI to SD) only, as the other services such as networking are obviously not available without an OS. If that ran on one core, the other three could potentially bridge Wifi/Ethernet etc.
  8. Bunsen

    Ethernet via SCSI2SD V6

    It's RS-422, and yes, you can. I know RS-232 can be bit-banged out the GPIO; I assume RS-422 wouldn't be substantially more difficult. At worst one might need one or two extra ICs [*]. It's possible to hive off one core of the quad-core CPU in the Pi, and some RAM, for an RTOS or baremetal code, leaving the other three + GPU to run a full *nix. This might help with bitbanging. The two environments share a RAM window to exchange data. The go-between *nix distro for a Pi or Pi-like to prepare The Internet for consumption by a 68k Mac (over Ethernet) is a solved problem, via mactjaap's MacIPgw or MacIPpi. Adding PPP over serial for a single machine should be trivial; full-blown Localtalk/Appletalk for a network of multiple machines may be a little more work, but netatalk and other such packages exist. For extra credit, one could attempt to use LocalTalk's ability to accept an external clock signal, and overclock the network for faster transfers. [*] possibly overkill: the Zilog Z80182 has a pair of RS-232/RS-422 HDLC capable intelligent UARTs. LocalTalk is based on HDLC. It would require a little bit of its own ROM and RAM, unless the Pi can handle it via Linux's Remote Processor thingy, like the 6502 in this project. Either way, it would require some Z80 coding. [*] Simpler, if and they are still available, might be one or more Zilog SCCs
  9. Bunsen

    John's Classic Restoration Thread

    Folks, please try not to quote a 23-photo post just to add a one line comment. Use the Reply To Post box instead of the Quote button. Edited.
  10. What happens if you use a PDS video card, and disable the motherboard video?
  11. Wow. While I can appreciate the convenience and flexibility, my gut instinct is that replacing one connector with another that looks identical and is completely different electrically is just asking for trouble.
  12. Bunsen

    DAYSTAR Universal PowerCache installation manual

    Unsurprising, seeing as I posted that comment six years ago. I suggest copying and pasting the link into archive.org
  13. Done, and removed the blockquote from around the content of the edited second post.
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