420 Series 1-5
The 420 series system board is composed of the following major components:
❑ Microprocessor
One Intel Pentium processor with VRT 64-bit microprocessor
Intel Pentium processor operates at 100 MHz and 3.3/2.9 volts
❑ Standard RAM
8 MB, four 1Mx16-bit chips
3.3 volt operation
No parity bit
Access time 60 ns
Data transfer is 64-bit width
EDO (extended data output) supported
❑ BIOS ROM (Flash EEPROM)
128 KB (one 128Kx8-bit chip) memory
64 KB in the ROM are used for system BIOS
40 KB in the ROM are used for VGA BIOS
24 KB in the ROM are reserved
Access time 150 ns
Data transfer is 8-bit width
❑ Video RAM
2 MB (Four 256Kx16-bit DRAM)
5 volt operation
❑ Optional memory
One expansion memory slot is available for 8, 16, and 32 MB memory modules, which
consist of some 1 MBx16-bit chips.
Total maximum memory size is 40 MB (if a 32 MB memory module is installed).
3.3 volt operation
No parity bit
Access time 60 ns
Data transfer is 64-bit width
EDO (extended data output) supported
❑ One super integration (SI)
The following components:
- Two DMACs 82C37 equivalent
- Two PICs 82C59 equivalent
- Two UART 16550 equivalent
- One PIT 82C54 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
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