Toshiba T2150 series, Maintenance Manual

Page: 6 / 195

1-6 T2150 Series
❑
One super integration (SI)
The following components:
- Two DMACs 8237 equivalent
- Two PICs
8259 equivalent
- Two SIOs 16550 equivalent (One SIO is not used)
- One PIT 8254 equivalent
- One FDC TC8565 equivalent
- One VFO TC8568 equivalent
- One I/O port decode
- One SIO port control
- One printer port control supported ECP
- One FDD control
- One speaker control
- One power communication control
❑
System Controller Gate Array (VALCNT-GA)
This gate array has the following functions:
Data Bus driver
CPU data <==> ISA data
Address Bus driver
CPU address <==> ISA address
ISA control
SYCLK, DMCLK generation
ISA cycle control
DMA support control
External master support control
Refresh control
A20 control
RTC control
Clock/Reset/Suspend control
CPU clock control
STPCLK# and INTR/NMI/SMI# adjustment
SMI control
Current pass-through control
Suspend/Resume sequence
Reset generation
DMA control
Timing signal generation for DRAM
Cache control
DRAM address control
Level Shift Gate Array control
VGA chip control