1-1. System Board Devices And Features - IBM Personal System/2 60 Technical Reference

Device
Microprocessor
System Timers
ROM Subsystem
RAM Subsystem
CMOS RAM
Subsystem
Video Subsystem
Audio Subsystem
DMA Controller
Interrupt Controller
Keyboard/Auxiliary
Device Controller
DlskeHe Drive
Controller
Serial Controller
Parallel Controller
Micro Channel
Math Coprocessor
Socket
Power Supply
Type Features
80286
24-bit address and 16-bit data interface
Channel 0 - System timer
Channel 2 - Tone generation for speaker
Channel 3 - Watchdog timer
128KB (KB
=
1024 bytes)
1MB (MB
=
1,048,576 bytes)
Expandable on the channel
64-byte CMOS RAM with
real-time clock/calendar
2KB CMOS RAM extension
Battery backup
Auxiliary connector on the channel
Analog output
256KB video memory
Driven by:
- System-timer channel 2
- The 'audio sum node' signal.
Eight independent DMA channels
Single or burst transfers and read verification
16 levels of system interrupts
Interrupts are level-sensitive
Keyboard connector
Auxiliary device connector
Password security
Supports:
- 720KB formatted diskette density
- 1.44MB formatted diskette density.
1, 2 RS-232C interface
Programmable as serial port 1 or 2
FIFO mode" and character mode
Programmable as parallel port 1, 2, or 3
Supports bidirectional input and output
Eight channel connectors:
- 8- or 16-bit device support
- One with an auxiliary video extension
- One occupied by the fixed disk drive adapter.
Supports 80287 math coprocessors
Same clock speed as the system microprocessor
2 110 and 220 Vac support
" The FIFO mode is supported by the Type 2 serial controller.
Figure 1-1. System Board Devices and Features
1-4 Model 60 System Overview