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Ten megabits of through is likely not achievable, given the limitations of the serial hardware on the Mac side. I believe the faster serial is good for TWO megabits per second, if externally clocked. This was a "geoport" feature, so these speeds would likely be limited to Macs that shipped with...

These "universal" serial-only CommSlot PCBs just showed up today, and so far, we've only confirmed that they physically fit in both CommSlot I and CommSlot II sockets, which is a relief. It has footprints for an ESP8266-based Adafruit ESP-12F ($6.95), Raspberry Pi Pico or Pico W stamp...

Thanks, that's the assumption I was operating under, but it's nice to have it confirmed.

Good to know, thanks, @David Cook . Can you share any information on voltage levels/logic types for the serial pins? TTL? CMOS?

Thanks. Since this is the first report we've had of any firmware issues with 1.0.7, unless we can get a debug log from you, it's going to be exceedingly difficult to understand the root cause of this problem. We don't have a IIci to test with.

Thank you for the feedback. We appreciate it. I wish it hadn't taken as long as it did to resolve, but we found a few other small issues along the way, and ended up with better debug output as a result, so it wasn't all bad in the end. Thanks again!

Yes, on the Mac Plus, you must have the following two settings present in a zuluscsi.ini file: To quote Michael McMaster (Creator of SCSI2SD), "The Mac Plus is troublesome as it's bootrom code doesn't follow the SCSI standards. The SCSI standards recommend a SCSI selection abort timeout of...

@macuserman, We've just released firmware version 1.0.6 on GitHub, which should fully resolve the stability issues you've been seeing with your Quadra 700. Please upgrade at your convenience, and let us know here, if you continue to have any problems.

@Jockelill Please try the attached development firmware, and let us know if it results in any change of behavior for you with your Mac Plus. The diode mod won't fix your issue, but it's always preferable, for the sake of convenience, if nothing else, to be able to power it from termination power.

What's the size of the SD card you're using? Can you send me a photo of the front and back of the card?

Not sure where you got that (incorrect) memory address from.. The correct syntax/address is: dfu-util -a 0 --dfuse-address 0x08000000 -D firmware.bin

Today, we released ZuluSCSI firmware version 1.0.4, which adds the ability to disable the prefetch buffer at runtime, by setting PrefetchBytes=0 in the [SCSI] section of the zuluscsi.ini file. In our testing, we've found that disabling the prefetch buffer on Macs which support synchronous SCSI...

Please engage with us via e-mail, and _fully_ describe the problem, including which SD card you're using, etc. If you aren't seeing a log, it's because the ZuluSCSI isn't writing one, which almost certainly means it can't find an SD card. Please ensure you're using an SD card that's an...

It's one of the few viable options

With USB, you need to have a microcontroller that can act as a USB host, and with the current semiconductor/microcontroller shortages, that's a VERY difficult thing to obtain, particularly at a price that isn't highway robbery.

We haven't published a schematic yet, but it's very simple. We'll make one available soon.

That's a question for @tashtari to answer, since he wrote the TashTrio assembly code, which is open source. Tash?

And now, there's a hardware reference design for TashTrio, appropriately named PS2ADB. We're working on a 3D-printed enclosure, since there's exposed +5 volts DC on the bottom of the PCB. We'll be releasing the schematic for it in the near future. Anybody who would like to know more about...

PS2ADB is a stand-alone utility device for use with any ADB-based Macintosh computer, allowing use of very inexpensive keyboards and mice, including optical mice, with any Macintosh that has an ADB port. PS2ADB is powered by @tashtari's TashTrio PIC firmware, which was announced back in...

@frankz seems to have figured this out. It's related to the driver using blind transfers. I'll let him share more, so we're not playing a game of telephone.