Toshiba T1960CS, Maintenance Manual

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T1960CS/T1960CT
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The T1960CS/T1960CT system board is composed of the following major components:
❑
An i486DX2-50 CPU
❑
Super Integration (SI) T9901, which stores the following components:
• Two Direct Memory Access Controllers (DMAC): 82C37
• Two Programmable Interrupt Controllers (PIC): 82C59
• One Programmable Interval Timer (PIT): 82C54
• One Floppy Disk Controller (FDC): TC8565
• One Serial Input/Output Controller (SIO): TC8570
• One Variable Frequency Oscillator (VFO): TC8568
• One I/O Controller
• One Printer Port Controller
• One Speaker Controller
❑
A Real Time Clock (RTC)
A T9934 chip with 128 bytes of memory is used. Fourteen bytes are used for the
calendar and clock, while the remaining 114 bytes are used for the system configura-
tion data.
OSC (X3) generates 32.768 KHz for RTC.
❑
A Keyboard Controller (KBC)
An M37452M4 chip is used.
The KBC, which includes the keyboard scan controller and keyboard interface control-
ler, controls the internal keyboard, external keyboard port, PS/2 mouse port, and Ball
Point Quick Port.
❑
Memory
Standard RAM: 4 MB
Cache memory: 8 KB (inside CPU)
BIOS ROM: 128 KB (96 KB are used)
The ROM contains the Initial Reliability Test (IRT), Basic
Input/Output System (BIOS), and video BIOS.
Video RAM: 256 KB
Optional memory cards expand memory to a maximum of 20 MB.
❑
VGA display controller
T1960CS (GOGH): This controller controls the internal and external VGA compat-
ible display.
T1960CT (WD90C24): This controller controls the internal VGA display and external
SVGA compatible display.