Toshiba T2100 Series Maintenance Manual page 7

The T2100/T2105 Series system board contains the following functional components:
One SL Enhanced Intel 486DX2-50 32-bit math coprocessor.
i486DX2 operates at 50 MHz and 3.3 volts.
Standard RAM
4 Mbytes, two 1024 x 16-bit chips (T2100/T2100CS)
8 Mbytes, four 1024 x 16-bit chips (T2100CT)
5 volt operation
No parity bit
Access time: 70 ns
Data transfer is 32-bit width.
Cache memory
Eight (8) Kbytes of cache memory are stored inside the i486DX2.
Four-way set-associative method.
BIOS ROM (Flash EEPROM)
128 Kbytes (one 128Kx8-bit chip) of memory.
64 Kbytes are used for the system BIOS.
40 Kbytes are used for the VGA BIOS.
24 Kbytes are reserved.
Access time: 150 ns.
Data transfer is 8-bit width.
Video Ram
512 Kbytes (T2100).
1 Mbyte (T2100CS/T2100CT).
5 volt operation.
Access time: 70 ns.
Optional memory
One expansion memory slot is available for 4, 8, 16 and 24 Mbyte memory
modules.
Total maximum memory size is 28 Mbytes for the T2100/T2100CS and 32
Mbytes for the T2100CT (if a 24 Mbyte module card is installed.)
3.3 volt operation
No parity bit
Access time: 70 ns
T2100 Series
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