IBM 84F7994 | 8556/57SX 20MHz System Board for PS/2

Here are 12 technical specifications for the IBM 8556/57SX 20MHz System Board for PS/2:

1. Processor: Intel 80386SX-20 MHz
2. Memory: 2MB (expandable to 16MB)
3. Cache: 0.5MB
4. Expansion Slots: 3 ISA slots, 1 Micro Channel Architecture (MCA) slot
5. Video: Integrated VGA graphics
6. Audio: Integrated audio
7. Floppy Drive Controller: Supports up to two floppy drives
8. Hard Drive Controller: Supports up to two IDE hard drives
9. Serial Ports: Two RS-232C serial ports
10. Parallel Port: One Centronics-compatible parallel port
11. Keyboard and Mouse Ports: PS/2 compatible
12. Power Supply: 110/220V switchable

Helpful notes:
1. The MCA slot is not compatible with ISA or EISA cards.
2. The system board requires a separate power supply unit (PSU).
3. The integrated audio supports Sound Blaster Pro-compatible audio.