As part of diagnosing the issues with my Disk II interface card, I thought I would see whether there were any issues with the PROM, as this would definitely cause issues with reading or writing disks.

The card itself is made up of a number of ICs:

• SN74LS14N - Hex/6 Way Inverter
• SN74LS132N...

While cleaning the keyboard here I noticed a strange problem.

After I had cleaned the keyboard, the machine consistently did not boot correctly. Instead, it would boot to the internal self-test routine. This is usually invoked by pressing solid apple-control-reset. However, instead of displaying...

First step (after cleaning the case etc) will be to fix the keyboard.

Many of the keys stay down when pressed, and some appear to not work at all.

Firstly, I removed the keycaps completely, and cleaned the dust and grime away from underneath the keycaps. I could see with the keycaps removed the...

Many years ago, I had an extensive collection of vintage microcomputers. These included what could be considered run-of-the-mill machines like the Sinclair Spectrum, the Acorn BBC Micro and the Amstrad CPC. Also included were some much rarer machines, like an RM 480Z, a BBC Master Compact, and a Mac...