PCRB3 (EPSON)

Internal expansion RAM board for Epson desktop machine, PC-286 model 0 / X / V / VE / VF / VS.
PCZRM (1MB capacity) can be added to 4 SIMM slots on the board with a capacity of 2MB.
One 8-dip dip switch, one 4-dip dip switch, and 1 slide switch on the board
Yes.

・ 8 stations dip switch SW1: Use / nonuse of memory on RAM board, address space
　settings of
1-2-3: RAM board memory size setting
　ON-ON-ON: 0MB (RAM board memory not used)
　OFF-ON-ON: 1 MB (use only 1 MB of memory of PCRB3)
　ON-OFF-ON: 2 MB (when only PCRB3 is installed)
　OFF-OFF-ON: 3MB (PCRB3 + 1 PCZRM) (Factory setting)
　ON-ON-OFF: 4 MB (two PCRB3 + PCZRM)
　OFF-ON-OFF: 5 MB (3 PCRB3 + PCZRM)
　ON-OFF-OFF: 6 MB (4 PCRB3 + PCZRM)
　OFF-OFF-OFF: Not settable
4-5-6: Setting of main unit model
　OFF-ON-OFF: PC-286 VF
※ Since this table is based on the description of the manual of PC-286 VF, when using with other models
　The setting of is unknown so far.
7: Setting of presence / absence of parity check
　ON: Does not check parity
　OFF: Perform parity check (factory setting)
8: No change (always OFF)

· 4 stations dip switch SW2: setting the start address of the address space
1-2-3-4: Setting the address space used by the board
　ON-ON-ON-ON: Setting prohibited
　OFF-ON-ON-ON: 100000H (factory setting)
　ON-OFF-ON-ON: 200000H
　OFF-OFF-ON-ON: 300000H
　ON-ON-OFF-ON: 400000H
　OFF-ON-OFF-ON: 500000H
　ON-OFF-OFF-ON: 600000H
　OFF-OFF-OFF-ON: 700000H
　ON-ON-ON-OFF: 800000H
　OFF-ON-ON-OFF: 900000H
　ON-OFF-ON-OFF: A00000H
　OFF-OFF-ON-OFF: B00000H
　ON-ON-OFF-OFF: C 00000 H
　OFF-ON-OFF-OFF: D00000H
　ON-OFF-OFF-OFF: E00000H
　OFF-OFF-OFF-OFF: Setting prohibited
※ Set in order from the lower address.Also, when mounting multiple RAM boards,
　Set the address space used by each RAM board to be continuous.

・ Slide switch SW3: Setting of main unit model? (PC-286VF manual features
　No description about
　When using with PC-286 VF, set it on the opposite side of the 4-station dip switch SW2.