Toshiba T2150 series, Maintenance Manual

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T2150 Series 1-5
The T2150 series system board has the following functional components:
❑
One Intel DX4-75 32-bit microprocessor.
Intel DX4 operates at 75 MHz and 3.3 volts.
❑
Standard RAM
4 Mbytes, two 1024x16-bit chips with no parity bit. (T2150CDS)
8 Mbytes, four 1024x16-bit chips with no parity bit. (T2150CDT)
5-volt operation.
Available high speed page mode access.
Access time 70 ns.
Data transfer is 32-bit width.
❑
Cache memory
The 16 Kbytes of cache memory is stored inside the DX4 processor.
Four-way set-associative method.
❑
BIOS ROM (Flash EEPROM)
128 Kbytes (one 128Kx8-bit chip) memory.
64 Kbytes in the ROM are used for system BIOS.
40 Kbytes in the ROM are used for VGA BIOS.
24 Kbytes in the ROM are reserved.
Access time 150 ns.
Data transfer is 8-bit width.
❑
Video RAM
1 Mbyte, two 256Kx16-bit chips.
5-volt operation.
Access time 70 ns.
❑
Optional memory
One expansion memory slot is available for 4, 8, 16, and 24 Mbyte
memory modules, which consist of 1024Kx16-bit chips with no parity
bit.
Maximum memory size is 28 Mbytes for the T2150CDS and 32
Mbytes for the T2150CDT (if a 24 Mbyte memory card is installed).
5-volt operation.
High-speed page mode access.
Access time 70 ns.