PCRB7 (EPSON)

Epson desktop machine, PC-386 / V / S / G / GE / GS, 486 GF / GR / GR + / GR Super
Built-in RAM base board.4 SIMM sockets and 1 6 dip switch on board,
There are 2 rotary switches.The SIMM socket is a pair of two SIMMs of Epson specification with the same capacity
Can be expanded by (1MB, 2MB, 4MB SIMMs can be used). The 386GE can be expanded by 1 unit.

・ 6-deep dip switch SW1: parity check, specification of main unit model
1: Specify parity check
　ON: Does not check parity
　OFF: Perform parity check (factory setting)
2: Specify the model
　ON: PC-386S, 486GR / GR + / GR Super
　OFF: PC-386 / V / G / GE / GS, 486 GF (factory setting)
3, 4, 5: Not used, always OFF
6: Designation of machine type
　ON: PC-386G
　OFF: PC-386 / V / S / GE / GS, 486 GF / GR / GR + / GR Super (factory setting)

· Rotary switches SW2 and SW3: Memos to which memory on the RAM board is allocated
　Specify start address of address space
　PCRB01 / PCRB8 are assigned according to the memory capacity mounted on the PC main unit.
　Specify the start address to be sent.
The following is the order of the SW2 SW3 Start Address:
0 ■ 0 ■ does not work 1 ■ 0 ■ 1000000H ~ 2 ■ 0 ■ 2000000 H ~ 3 ■ 0 ■ 3000000 H ~
0 1 1 100 000 H 1 1 1 11 000 H 2 1 1 21 000 H 2 3 1 1 31 000 H
0 ■ 2 ■ 200000H ~ 1 ■ 2 ■ 1200000 H ~ 2 ■ 2 ■ 2200000 H ~ 3 ■ 2 ■ 3200000 H ~
0 ■ 3 ■ 300000H ~ 1 ■ 3 ■ 1300000 H ~ 2 ■ 3 ■ 2300000 H ~ 3 ■ 3 ■ 3300000 H ~
0 ■ 4 ■ 400000H ~ 1 ■ 4 ■ 1400000 H ~ 2 ■ 4 ■ 2400000 H ~ 3 ■ 4 ■ 3400000 H ~
0 ■ 5 ■ 500000H ~ 1 ■ 5 ■ 1.500000 H ~ 2 ■ 5 ■ 2500000 H ~ 3 ■ 5 ■ 3500000 H ~
0 ■ 6 ■ 600000H ~ 1 ■ 6 ■ 1600000 H ~ 2 ■ 6 ■ 2600000 H ~ 3 ■ 6 ■ 3600000 H ~
0 ■ 7 ■ 700000H ~ 1 ■ 7 ■ 1700000 H ~ 2 ■ 7 ■ 2700000 H ~ 3 ■ 7 ■ 3700000 H ~
0 ■ 8 ■ 800000H ~ 1 ■ 8 ■ 1800000 H ~ 2 ■ 8 ■ 2800000 H ~ 3 ■ 8 ■ 3800000 H ~
0 ■ 9 ■ 9 00000 H ~ 1 ■ 9 ■ 19 00000 H ~ 2 ■ 9 ■ 29 00000 H ~ 3 ■ 9 ■ 39 00000 H ~
0 ■ A ■ A 00000 H ~ 1 ■ A ■ 1 A 00000 H ~ 2 ■ A ■ 2 A 00000 H ~ 3 ■ A ■ 3 A 00000 H ~
0 ■ B ■ B 00000 H ~ 1 ■ B ■ 1 B 00000 H ~ 2 ■ B ■ 2 B 00000 H ~ 3 ■ B ■ 3 B 00000 H ~
0 ■ C ■ C 00000 H ~ 1 ■ C ■ 1 C 00000 H ~ 2 ■ C ■ 2 C 00000 H ~ 3 ■ C ■ 3 C 00000 H ~
0 ■ D ■ D 00000 H ~ 1 ■ D ■ 1 D 00000 H ~ 2 ■ D ■ 2 D 00000 H ~ 3 ■ D ■ 3 D 00000 H ~
0 ■ E ■ E 00000 H ~ 1 ■ E ■ 1 E 00000 H ~ 2 ■ E ■ 2 E 00000 H ~ 3 ■ E ■ 3 E 00000 H ~
0 ■ F ■ not possible 1 ■ F ■ 1 F 00000 H ~ 2 ■ F ■ 2 F 00000 H ~ 3 ■ F ■ 3 F 00000 H ~

※ In fact, the memory obtained by subtracting the conventional memory from the main unit mounted memory
　You will set the value plus one.For example, the main unit mounted memory is 5.6MB
　Then set SW2 to 0 and SW3 to 6.This is additional RAM such as EPRB01
　Common to baseboards.