The T191 0 Series system board is composed
of
the following major components:
o
An
i486SX-33 CPU
o 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 (FOC): 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
o A Real Time Clock (RTC)
One T9934 chip
is
used. The T9934
has
128
bytes
of
memory. Fourteen bytes
of
memory are used for the calendar and clock. The remaining 114 bytes are used for the
system configuration data.
OSC (X3) generates 32.768 KHz for RTC.
o A Keyboard Controller (KBC)
One M37452M4 chip is used.
This
KBC
includes the keyboard scan controller and keyboard interface controller.
The
KBC
controls the internal keyboard, external keyboard port, PS/2 mouse port,
and Ball
Point Quick Port.
o The following memories:
Standard
RAM:
Cache memory:
BIOS ROM:
4MB
8
KB
(inside CPU)
128
KB
(96
KB
are used)
This
ROM contains
Initial
Reliability
Test (lRT), Basic
Input/Output System
(BIOS), and video BIOS.
Video RAM: 256
KB
Optional memory cards expand memory to a
maximum.
of20
MB.
o VGA display controller
Add-4
GOGH: This controller controls internal and external VGA compatible display.
OSC(X4) generates 28.322MHz for display controller.
OSC(X5) generates 25. 175MHz for display controller.
--------------T1910
Series
Maintenance
Manual Addendum
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