zimmers.net (CP/M disk images, system guide)
DocumentsNo documents found.
The original power supply fan is pretty noisy. It is a good idea to replace it with a modern quiet fan, for example Noctua NF-A6x25 FLX. The plug of that fan is compatible with the power supply socket without any modifications.
Floppy Disk Controller
Changing the internal FDD device number
The internal floppy disk drive is pre-configured as device 8 on the controller. This will become a problem in case you want to use a SD2IEC floppy emulator as your main drive. Many full disk games have hardcoded disk drive number 8 and will only run a loader from the emulator, after which they will want to access the internal drive to load the game.
The internal FDD device number can be changed with a simple mod. On the controller there are two pairs of small pads named DRV SEL which by default are connected with a small trace on both pairs. Cut both traces with a knife and mount a pair of switches to select the device number. I found it is best to remove solder from two PCB vias connected to the pads and solder wires through the vias. Then connect them to two switches and mount them in the computer cover. The combinations for the drive number are the following:
- SW1=1, SW2=1 – device number 8
- SW1=0, SW2=1 – device number 9
- SW1=1, SW2=0 – device number 10
- SW1=0, SW2=0 – device number 11
Or simply: device number = not(SW1 + 2^SW2) + 8
Floppy Disk Drive
Mitsumi Electric D502
[…] Commodore 1802 monitor was released in 1986, it matches well the white-case Commodore C64G, C128 and C128D. […]
[…] my father needed one for his job as a mathematician, so I had the privilege of growing up on a Commodore 128-D – “D” for Disk Drive (5¼-inch disk drive built in, rather than as a separate device), which […]