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That's too bad. I've had good luck with this seller. Just received some EEPROM and EPROMs from them. https://www.ebay.com/str/jkpartsstore?_bkw=27c512

Here is the parts list I used on my Classic II analog board with the same model number. Includes digikey part numbers. https://docs.google.com/spreadsheets/d/e/2PACX-1vSV2LyGPEhFxpr9oA6FZ2DG7m42-P6yyeyOlBUpjrZJ2qcMCRyWYQzCNh56eypgUVyW4OP-M_NmQE2-/pubhtml

This now seems to be fixed in the 6.3.2 firmware released in Oct 2020. http://www.codesrc.com/files/scsi2sd-v6/v6.3.2/ Disable blind writes after updating the firmware.

Color Squeeze on the mentioned CD was what I needed. Thanks for the tip.

The one file in question still shows as a TIFF file when reading the header. But no TIFF reader including 1.x versions of Graphics convertor will open it. Which is what leads me to believe its compressed with SQUEEZE like the disk mentions. I'm still extracting other disks and I assume I'll find...

I had a similar thing with my CII sound was intermittent. I ended up removing the sound chip cleaning and resoldering to solve it.

Per wikipedia the Mac II shipped with a IWM. Which is how my board is labeled. Pretty sure the get what you want you need to swap the IWM for a SWIM.

Voltages ok when under load?

I am working on extracting images from a clipart collection called "Electronic Clipper". The images seem to be compressed with Disk Doubler and a program called SQUEEZE or possibly COLORSQUEEZE™ Decompress. The first disk user guide mentions that the collection should have a disk with Squeeze on...

Thanks

Does anyone know the equivalent EPROM chip for the Macintosh II? I assume its either 4x 27C512 or 4x 27X128.

Sorry don't know why I said Mac Alley in the subject.

I recently acquired a Macintosh II which had a 030 accelerator card in the CPU socket. I'm wondering how to safely remove this so I can inspect underneath. Any pointers?

You could just leave a space for the many pre built modules out there. Here is an example. https://a.aliexpress.com/_mNPE3bn

He specifically says you can: The 2 ROM version of Classic II can use two 27c400 EPROMs of 100ns or faster (150ns won't work) to replace the system ROMs. The 4 ROM version can use four 27c010's. I did my development with the 2 ROM version because half the number of chips to remove, erase...

https://www.arrow.com/en/research-and-events/articles/principles-of-grounding-for-mixed-signal-designs#:~:text=Analog Ground vs.,problems in sensitive analog circuits.

A hair dryer could be used to preheat the board of one doesn't have a hot air station.

Even back in the day auto negotiate was troublesome. It was quite common to hard set speed and duplex.

Sounds like your hub may not be negotiating speed. Is it a gigabit hub?

Did you go with EEPROMs or EPROM? Also good instructions at the bottom of this thread. In general the process is not difficult assuming you can get parts. Also don't assume EPROMs are shipped blank. Verify before writing. I've only burned only for my Classic...