PCRB02 (Epson)

Epson built-in RAM base board for desktop machine, PC-486MU / MS / MV / MR / RS
(This itself 0MB).4 SIMM sockets and 1 6 dip switch on board,
There is one 8-deep dip switch and two rotary switches.For SIMM sockets
Epson-specific SIMM or JEDEC-specific SIMM can be added.SIMM of EPSON specification
Is not available for 1MB (2MB, 4MB, 8MB SIMMs are available).JEDEC specification
SIMM can be used up to 16MB.
Unlike ERF and EP-RB02, SIMM of JEDEC specification can be used even without SIMM-ID
(In order to specify the SIMM capacity by the 8 series dip switches on the board)
It is unknown whether EDO SIMM can be used.

・ 6 stations dip switch: Designation of type of SIMM to be added
1, 2, 3, 4: Designation of SIMM type
　Each,
　ON JEDEC specification SIMM
　OFF SIMM of EPSON specification or SIMM non-attachment
5-6: Always OFF-OFF (no system reservation or change)

・ 8 series dip switches: SIMM capacity specification of JEDEC specification
　1-2 SIMM socket 1,3-4 SIMM socket 2,5-6 SIMM socket 3,7-8
　Supports SIMM socket 4 respectively, and specifies SIMM capacity of JEDEC specification
　ON-ON 4MB
　OFF-OFF 8MB
　ON-OFF 16MB
　OFF-ON ■ Setting prohibited

· Rotary switches SW2 and SW3: Memos to which memory on the RAM board is allocated
　Specify start address of address space
　PCRB02 is assigned according to the memory capacity mounted on the PC main unit
　Specify the start address.
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.