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Frankenstein's monster is alive! The new rom flashing program worked like a charm, and my Mac is now fully up and running! I noticed that there is a slight hum from the speaker, but I think it's alright.

Aha! I figured out that the arduino rom writing program had a bug where it refused to write to hex address 0x0. I switched over to another arduino project https://bertiusgames.com/projects/eeprom.html, and this one seems to work (the hex data on the chip was identical to the data in the original...

I'm going to compare the hex data from the chip with the hex data from the original file to see if they're the same later If they are the same then it's probably something wrong with the board.

Yes, It uses a 74HCT02 for that, I just have it on the bottom out of view.

Here's a picture of the Rom-Inator

I recently designed a single sided version of the Rom-Inator, but after flashing the roms and putting the Rom-Inator in the system, it threw up a simasimac on the screen. Any ideas why? I already tried reflashing the roms but that didn't change anything.

Sounds good, you might want to fiddle with the ram as well. Usually when you boot these macs it does quick a self-ram-check (the mouse isn't present when this happens). It may be getting stuck in the ram check for some reason.

I'm going to be milling the board for the ROM-INATOR today and should hopefully have it up and running by the weekend. I will post about it either here or in another thread

Every mac will throw up 0000000F 0000000D when you press the interrupt button during startup since the debugger isn't available.

Also, it speaks!

Update 4: I did reflow the solder joints but the problem persists. I did manage to put the drive from my Mac Classic in the 512ke and boot MacOS. I don't really have time to work out the problem with the original drive right now, but I may pick it up again someday and fix it.

Thanks for the tip! I'll try that out tomorrow.

Update 3: The top head was hit by something and became unaligned; maybe I could use the drive like a 400k disk drive? I'm getting a rominator kit so I can get a stable operating system running on it :)

It's so weird; I think there's something wrong with the disk drive. Sometimes it'll start loading Macos, then it stops and stays on the 'welcome to macintosh' screen forever. Does anyone know what's happening?

Update 2: Sometimes it will show the happy, the disk will start loading, then the computer will randomly jump back to the blinking disk screen. My grumpy old mac really doesn't want to boot ANYTHING

Update: I booted MacOS 6.0.2 on my Classic (worked fine), but when I tried booting it on the 512ke it threw up an error (illegal instruction error). It's so strange that it gives me so many errors.

I will try and make another system disk and report my results later. I predict that it's something up with the disk, but I find it strange that it only fully boots sometimes.

Unlike the Mac Plus, the 512ke uses chips soldered to the board instead of simms. Since the 512ke uses the Mac Plus's roms and pretty much is a Mac Plus with less ram, could I install higher capacity chips to upgrade the board to 1mb? Source: https://lowendmac.com/1986/mac-512ke/#:~:text

I think there's something up with my recently aquired Mac 512ke. It WILL boot from disk after many attempts (It usually throws up an error), and even when you get into the operating system it usually crashes*. I have a Macintosh Classic but I've never had something like this occur before. I'm...