ERF (メルコ)

Epson desktop machine, PC-486SE / SR / FE / FR / FS / MU / MR / MS / RS / MV built-in
RAM base board.Three SIMM sockets and one 8-dip dip switch on the board,
There is one 2 jumper switch.
There is an operation report on PC-486GR etc. (Note 1).For MU / MR / MS / MV / RS, specifications of the main unit
As a result, if you add 61.6 MB or more of memory, you can not use the extended video function.
Note 1: For the PC-486P / GR / GF, etc., turn on the extension switch 2-2 (system reservation: normally OFF)
　　 By doing this, you will recognize memory of 14.6 MB or more.PC-386GS
　　 But the same, but driver software to recognize memory more than 16MB
　　(Eg 16giga.sys which is free software created by every black temporary section.Note
　　　In this case, even if you replace the CPU with Cx486DRx2 and add a coprocessor,
　　　The operation of Windows 95 was not very practical.CPU riser board
　　　If it has been replaced with PCCPU B11 (A) (and ODP has been additionally installed on it)
　　　It seems that the operation of Windows 95 will also be at a satisfactory level.

Merco EMF-P and EFB are to be added to the SIMM slot on the ERF.
In fact, even though these SIMMs, JEDEC up to 32MB with SIMM-ID
With SIMM in the specification, it can be used without parity / ECC, FP / EDO.
However, unless SIMM-ID is attached, it does not recognize normally.
Note 2: There is a report that SIMMs without SIMM-ID recognize only 1⁄4 of the capacity.
     But that's not the case, if you get 8MB x 2 and get 6MB, or insert multiple SIMMs,
     Some phenomena such as different capacity recognized at the socket position were also observed.
     In addition, it is not recognized normally if SIMM without one SIMM-ID is mixed.
Note 3: The first appearance of the SIMM-ID is posted on July 15-16, 1998 in the "knock room" bulletin board.
　　　・ MAL's Favorite (provisional) http://www.mal-o.com/index.html-> EPSON PC
　　　　　　　　　　　　　　　　　　　　　　　-> knock BBS LOG-> Part 11
　　　・ Direct link to file in Internet Archive is
　　　　http://web.archive.org/web/20080922155732/http://www.mal-o.com/epson%20pc/9807.htm

In addition, there is a limit to the total amount of memory that can be recognized by the main unit (PC-486SE / SR / FE / FR / FS
63.6 MB for (and 486 P) and 61.6 MB for PC-486 MU / MR / MS / RS / MV).This limit
The amount of memory exceeding is ignored.

・ 8-station dip switch SW1: Setting of SIMM start address mounted on ERF
1-2: System reservation.Always OFF-OFF
3-4-5-6-7-8: ERF start address
The following is the order of the amount of memory counted at startup: Start address: SW1 (3 to 8):
640KB ■ 100000h ■ ON-ON-ON-ON-ON-OFF
640 + 1024KB ■ 200000h ■ ON-ON-ON-ON-OFF-ON
640 + 2048KB ■ 300000h ■ ON-ON-ON-ON-OFF-OFF
640 + 3072KB ■ 400000h ■ ON-ON-ON-OFF-ON-ON
640 + 4096 KB ■ 500000 h ■ ON-ON-ON-OFF-ON-OFF
640 + 5120KB ■ 600000h ■ ON-ON-ON-OFF-OFF-OFF (default setting)
640 + 6144KB ■ 700000h ■ ON-ON-ON-OFF-OFF-OFF
640 + 7168KB ■ 800000h ■ ON-ON-OFF-ON-ON-ON
640 + 8192KB ■ 900000h ■ ON-ON-OFF-ON-ON-OFF
640 + 9216KB ■ A 00000 h ■ ON-ON-OFF-ON-OFF-ON
640 + 10 240KB ■ B 00000 h ■ ON-ON-OFF-ON-OFF-OFF
640 + 1264 KB ■ C 00000 h ■ ON-ON-OFF-OFF-OFF-ON-ON
640 + 12288KB ■ D 00000 h ■ ON-ON-OFF-OFF-OFF-ON-OFF
640 + 13312 KB ■ E 00000 h ■ ON-ON-OFF-OFF-OFF-OFF-ON
640 + 14336KB ■ F 00000 h ■ ON-ON-OFF-OFF-OFF-OFF
640 + 15360KB ■ 1000000h ■ ON-OFF-ON-ON-ON-ON
640 + 16384KB ■ 1100000h ■ ON-OFF-ON-ON-ON-OFF
640 + 17408KB ■ 1200000h ■ ON-OFF-ON-ON-OFF-ON
640 + 18432KB ■ 1300000h ■ ON-OFF-ON-ON-OFF-OFF
640 + 19456KB ■ 1400000h ■ ON-OFF-ON-OFF-ON-ON
640 + 20480KB ■ 1500000h ■ ON-OFF-ON-OFF-OFF-ON-OFF
640 + 21 504KB ■ 1600000h ■ ON-OFF-ON-OFF-OFF-OFF-ON
640 + 22528KB ■ 1700000h ■ ON-OFF-ON-OFF-OFF-OFF
640 + 23552KB ■ 1800000h ■ ON-OFF-OFF-ON-ON-ON
640 + 24 576 KB ■ 1900000 h ■ ON-OFF-OFF-ON-ON-OFF
640 + 25600KB ■ 1A 00000 h ■ ON-OFF-OFF-ON-OFF-ON
640 + 26624KB ■ 1 B 00000 h ■ ON-OFF-OFF-ON-OFF-OFF
640 + 27648KB ■ 1C00000h ■ ON-OFF-OFF-OFF-OFF-ON-ON
640 + 28672KB ■ 1D 00000 h ■ ON-OFF-OFF-OFF-OFF-ON-OFF
640 + 29 696 KB ■ 1 E 00000 h ■ ON-OFF-OFF-OFF-OFF-OFF
640 + 30720KB ■ 1F 00000 h ■ ON-OFF-OFF-OFF-OFF-OFF
640 + 31 744KB ■ 2000000h ■ OFF-ON-ON-ON-ON-ON
640 + 32768KB ■ 2100000h ■ OFF-ON-ON-ON-ON-OFF
640 + 33 792KB ■ 2200000h ■ OFF-ON-ON-ON-OFF-ON
640 + 34816KB ■ 2300000h ■ OFF-ON-ON-ON-ON-OFF-OFF
640 + 35840KB ■ 2400000h ■ OFF-ON-ON-OFF-ON-ON
640 + 36864KB ■ 2500000h ■ OFF-ON-ON-OFF-ON-OFF
640 + 37888KB ■ 2600000h ■ OFF-ON-ON-OFF-OFF-ON
640 + 38912KB ■ 2700000h ■ OFF-ON-ON-OFF-OFF-OFF
640 + 39936KB ■ 2800000h ■ OFF-ON-OFF-ON-ON-ON
640 + 40960KB ■ 2900000h ■ OFF-ON-OFF-ON-ON-OFF
640 + 41984KB ■ 2A 00000 h ■ OFF-ON-OFF-ON-OFF-ON
640 + 43008KB ■ 2B 00000 h ■ OFF-ON-OFF-ON-OFF-OFF
640 + 44032KB ■ 2C00000h ■ OFF-ON-OFF-OFF-OFF-ON-ON
640 + 45056KB ■ 2D 00000 h ■ OFF-ON-OFF-OFF-OFF-ON-OFF
640 + 46 080 KB ■ 2E 00000 h ■ OFF-ON-OFF-OFF-OFF-OFF-ON
640 + 47104KB ■ 2F 00000 h ■ OFF-ON-OFF-OFF-OFF-OFF-OFF
640 + 48128KB ■ 3000000h ■ OFF-OFF-ON-ON-ON-ON
640 + 49152KB ■ 3100000h ■ OFF-OFF-ON-ON-ON-OFF
640 + 50176KB ■ 3200000h ■ OFF-OFF-ON-ON-OFF-ON
640 + 51 200KB ■ 3300000h ■ OFF-OFF-ON-ON-OFF-OFF
640 + 52224KB ■ 3400000h ■ OFF-OFF-ON-OFF-ON-ON
640 + 53248KB ■ 3500000h ■ OFF-OFF-ON-OFF-ON-OFF
640 + 54272KB ■ 3600000h ■ OFF-OFF-ON-OFF-OFF-OFF
640 + 55 296KB ■ 3700000h ■ OFF-OFF-ON-OFF-OFF-OFF
640 + 56,320KB ■ 3800000h ■ OFF-OFF-OFF-ON-ON-ON
640 + 57344KB ■ 3900000h ■ OFF-OFF-OFF-ON-ON-OFF
640 + 58368KB ■ 3A00000h ■ OFF-OFF-OFF-ON-OFF-ON
640 + 593 932 B ■ 3 B 00000 h ■ OFF-OFF-OFF-ON-OFF-OFF
640 + 60416KB ■ 3C00000h ■ OFF-OFF-OFF-OFF-OFF-ON-ON
640 + 61440KB ■ 3D 00000 h ■ OFF-OFF-OFF-OFF-OFF-ON-OFF
640 + 62464KB ■ 3E00000h ■ OFF-OFF-OFF-OFF-OFF-OFF-ON
640 + 63448 KB ■ 3F 00000 h ■ OFF-OFF-OFF-OFF-OFF-OFF-OFF

・ 2 jumper switch JP1: Used in combination with WAP-EP:
　Melco local bus window accelerator when equipped with 55.6 MB or more of memory
When used with WAP-EP (Video memory 3.800000h to 8MB), open JP1 of ERF
Do.In this case, the memory of 55.6 MB or more is invalid (when the memory is 55.6 MB or less)
Is a JP1 short).