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Just a size reference on the meanwell rpt 60b , but rpt-60a might be better as it has -5V, 5V and 12V

The Mac Plus requires 5V for logic things, +12V for floppy, and -12V for serial.

You could add a 7905 regulator to the -12V rail to get -5V, however the RPT 60A version has -5V,5V and 12V if -12V was not needed

Just guessing at looking at the ICS but the two long identical ICs are double UARTs so that 4 UARTs and a lot of the ICs are RS-422 drivers. So it looks like a serial I/O control board that works in an electrically noisy environment. With the card installed you could boot to DOS and use debug...

Oh great idea , on the PSU side , the Meanwell RPT-60B PSU would have the +5V,12V and -12V For video, the pi based RGB2HDMI (https://github.com/hoglet67/RGBtoHDMI) can do that And as a Pi it can do double duty as a retro station with the swap of an SD card.

It looks like the 17" Multiscan only goes down to 31.47kHz, not very many montors at the time could do 15kHz and 30kHz+ . but there is a list of them http://15khz.wikidot.com/ TFTs and I have attached a list of 15Khz capable CRT monitors

I dont know why its not in it. Maybe just overlooked. The Apple AppleColor 12" RGB Monitor (A2M6014) designed for IIGS 15Khz , thats the monitor I am after but dont think I will ever find one Specs below. This can work with some old Macintosh II cards that can output 640x200 NTSC, Then...

David is correct, there is more than just pin compatibility. There are no 15Khz Mac monitors. The 12" LC monitor is 24.48kHz

Yes indeed, actually I took a shot with the pi and a usb to adb adaptor (you can see it there on the right) All working fine, and attached a pic of the pi running the Mac emulator.

Sure, the limitation is with the RGBtoHDMI analog to Digital. It does not have the bit depth if you connect to the external port as thats analog only. It works and looks good too but some cases have missing colours or reduced depth. I debated this too but since I am soldering to solder joints...

Currently working on a one of these but I am kinda stumped. Its a non backlight model. I have fully recapped it, (every cap was leaking, including the axials) So I can get it to Bong, and will show flashing floppy. The Connor SCSI drive is working, and it can boot, but after booting it emits a...

So I recently got my first IIGS, but I am having no luck finding the monitor for it. I really wanted a CRT on it but none of the Macintosh monitors are compatible. Along comes RGBtoHDMI https://github.com/hoglet67/RGBtoHDMI This can take the Digital RGB signals from the IIGS DAC resistor...

Playing with old computers, breaking them, maybe fixing them.