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Ron’s Computer Video is selling a custom board, based on the Pico Micro Mac. Assembled, less the Raspberry Pi Pico for $10 plus shipping. You can also buy the completed assembly with the Pico soldered and programmed for $20 plus shipping https://jcm-1.com/product/picomicromac/ Now that...

Capacitor liquid is partially conductive. Capacitor residue between IC legs is causing low voltage readings, because there are weak shorts between IC legs. The residue must be removed around ICs.

Can’t you use the Startup Disk Control Panel to select your startup drive?

The Raspberry Pi is an inexpensive single board computer that has lots of GPIO pins and runs Linux. The RPi uses a MicroSD card as disk storage. Using a modern PC or Mac, you install the Raspian OS onto a MicroSD card (8 GB or larger) using the Raspberry Pi Imager program...

Another alternative If you have a newer G3 or G4 Mac, 1.44 MB 3.5 inch floppy drives are cheap. Ebay has multiple listings for VST Technologies, Portable USB Floppy Disk Drive 1.44mb, MAC Sealed for $19.95+shipping.

You can try VirtualPC 2, which is available on macintoshgarden. You want the DOS version, which has these system requirements: Any PowerPC 601, 603, 603e, 604, 604e, and G3 running at 100mhz or faster recommended Mac OS 7.5.5 or later RAM Requirements: 20MB installed physical RAM minimum - 24MB...

I was a Manufacturing Engineer in the PCB business for many years. My opinion is someone has intentionally applied WAY more current to that board than was required. 500 mA at 5V (USB maximum) will not blow those large traces off the board. You need about 100V at 15 Amps to do that kind of damage.

I look forward to the Pico 2 and related boards. All those improvements on the Pico 2 will cost you a whopping $1 over the price of the original Pico...

i would install a PC emulator on your Mac. Insert the disk and confirm you can read the directory and copy files from your emulated PC. If you have a PowerPC Mac, you can install Virtual PC (old commercial software). If you have an Intel Mac or newer, you can install the free PC emulators...

A Class 2 card is very slow according to https://en.wikipedia.org/wiki/SD_card You should use a Class 10 card or faster. SanDisk Ultra or Extreme are good choices. You should be able to buy a SanDisk 32 GB Ultra or Extreme for $10.

Great job. I see the problem IC had a leaking capacitor on both ends. The old cap juice is nearly invisible, and takes some effort to remove completely.

Well there is ZuluSCSI, that lets you move files via USB… I don’t want to start a war - I own both.

BlueSCSI has a transfer utility. This utility allows you to transfer files from your SD card to and from your Mac. Create a folder on the root of the SD card called shared Use your modern computer and place files in the shared folder of your SD card. You can try this with files downloaded...

Interesting. Seems similar to the ESP32 Softcard that was recently released https://www.tindie.com/products/cvt/esp32-softcard-expansion-card-for-the-apple-ii/?pt=ac_prod_search

Looks like FWB CD-ROM ToolKit 4.0 is what you need.

Nice - I saw the video yesterday. Any thought about adding mounting points for a FDHD?

I’d bet the drive will work if you install CDRom Toolkit compatible with MacOS 8.1

The Roland SC88ST has a Mac Serial port on it, as does the Yamaha TG100, MU50 and other MIDI devices of the era. Why are you using the Pocket MAC interface?

Very Nice

Ok, thanks for the quick update. I‘m happy the chip can be programmed with the PICKIT 3 - so I don’t need to invest in a new programmer. Great project - will definitely build one, as I only have one Gravis Gamepad and it’s held up well thru the years.