There is a RF connector and a 13-pin DIN socket that combines composite video and RGB signals. If you have a monitor that supports 15 kHz horizontal sync frequency, you can connect the 13-pin DIN socket to VGA input.
One of the unfortunate features of Atari ST is that its low/medium resolution mode (color) and high resolution mode (monochrome) are selected through a pin on its video port. So there are two separate cables needed to cover all graphics modes.
VGA Monochrome cable
VGA color cable
- Idea is described at info-coach.fr
Floppy Disk Drive
The original FDDs may be worn out and refuse to read the disks. It is possible to replace them with a PC 1.44MB FDD, for example Sony MPF920. There are two things needed to make it work:
- Changing the drive select from SEL1 to SEL0, either through jumpers (earlier models) or through a soldering fix
- Connecting the drive data cable upside-down
Unfortunately the original front plate of the drive may not fit the new one.
Atari Forum contains a lot of detailed information on FDD replacement.
In the absence of the original Atari mouse, it is possible to connect a USB mouse through an adapter. I purchased and recommend a TOM+ adapter, that also fits Amiga and C64/128.