Table of NEC's Memory Expansions [PC98]
Genuine NEC's Memory Expansions (for Desktops, except specific models)
| Model number | Name | Size | Supported models | Notes |
|---|---|---|---|---|
| PC-9801-51 | 増設RAMボード | 1MB | C-Bus expansion slots (>80286 processor) |
Memory for protected mode (<14.6MB) |
| PC-9801-52 | 増設RAMボード | 2MB | ||
| PC-9801-54 | 増設RAMサブボード | 1MB | PC-9801RA-01, etc. | Called "54SIMM", proprietary memory |
| PC-9801-61 | 増設RAMサブボード | 2MB | PC-9821A-B01, etc. | Called "61SIMM", proprietary memory |
| PC-9821A-B02 | 増設RAMサブボード(4MB) | 4MB | PC-9801BA2,BA3,BA4 PC-9821Af,An,Ap2,Ap3 PC-9821Bf,Bp,Bs,Be PC-9821Xn,Xp,Xs,Xe PC-9821A2-B01, etc. |
72pin SIMM/FPM/Parity |
| PC-9821A-B03 | 増設RAMサブボード(8MB) | 8MB | ||
| PC-9821A-B04 | 増設RAMサブボード(16MB) | 16MB | ||
| PC-9821BF-B01 | 増設RAMサブボード(32MB) | 32MB | Some models cannot recognize. | |
| PC-9821XA-B01 | 増設RAMサブボード(4MB) | 4MB | PC-9821Xa,7,9,10,12 PC-9821Xa13,16 PC-9821Xb,Xc,Xf,Xt ValueStar, Canbe |
72pin SIMM/FPM/70ns/Parity Install 2 SIMMs with the same capacity on Pentium machines |
| PC-9821XA-B02 | 増設RAMサブボード(8MB) | 8MB | ||
| SV-98/2-B01 | 増設RAMサブボード(16MB) | 16MB | ||
| SV-98/2-B02 | 増設RAMサブボード(32MB) | 32MB | Some models cannot recognize. | |
| PC-9821-ME1 | 増設RAMサブボード(4MB) | 4MB | PC-9821Xa(/W models) PC-9821Xc PC-9821Xv(/W models) CEREB、98MATE R、 98MATE ValueStar (exc:V7,10,12,V13/S7R) |
72pin SIMM/EDORAM/ECC Install 2 SIMMs with the same capacity. Some models support a non-ECC and FPM memory. |
| PC-9821-ME2 | 増設RAMサブボード(8MB) | 8MB | ||
| PC-9821-ME3 | 増設RAMサブボード(16MB) | 16MB | ||
| PC-9821-ME4 | 増設RAMサブボード(32MB) | 32MB | ||
| PC-9821-ME5 | 増設RAMサブボード(64MB) | 64MB | Some models cannot recognize | |
| PC-9821-MD1 | 増設RAMサブボード(32MB) | 32MB | PC-9821Xc13/S5, PC-9821Xc16, Xc200, PC-9821C166/D, PC-9821V16/S5P, PC-9821V166, V200, PC-9821V233/M7, etc. |
168pin DIMM/SDRAM Install max. 2 DIMMs or 4 SIMMs. |
| PC-9821-MD2 | 増設RAMサブボード(64MB) | 64MB |
The PC-9801-54 has a 16-bit bus width, and the PC-9801-61 has a 32-bit bus width. They are NEC's proprietary memory boards, so don't use a generic 72-pin SIMM instead of them.
Genuine NEC's Memory Expansions (for laptops and specific desktop models)
| Model number | Name | Size | Supported models | Note / Installable memory |
|---|---|---|---|---|
| PC-98XA-01 | 増設RAMボード(256KB) | 256K | PC-98XA C-bus slots | 3 x PC-98XA-02 |
| PC-98XA-02 | 増設RAMサブボード(256KB) | 256K | PC-98XA-01 | |
| PC-98XL-01 | 増設RAMボード | 0.5M | PC-98XL C-bus slots | |
| PC98XL2-01 | 増設RAMボード(2MB) | 2MB | PC-98XL2 | 2 x PC-98XL2-02 Install PC-98XL2-02 before |
| PC98XL2-02 | 増設RAMサブボード(2MB) | 2MB | PC-98XL2, PC98XL2-01 | |
| PC-98RL-01 | 増設RAMボード | 2MB | PC-98RL | Paired 2 x PC-9801-54 |
| PC-9801RA-01 | 増設RAMボード(1MB) | 1MB | PC-9801RA2, etc. | Paired 2 x PC-9801-54 |
| PC-9801RX-01 | 増設RAMボード(1MB) | 1MB | PC-9801RX2, RX21, etc. | 2 x PC-9801-54 |
| PC-9801ES-01 | 増設RAMボード | 1MB | PC-9801ES | 2 x PC-9801-54 |
| PC-9801EX-01 | 増設RAMボード | 1MB | PC-9801EX | 2 x PC-9801-54 |
| PC-9801RA-11 | 増設RAMボード | 2MB | PC-9801RA21, DA, etc. | 4 x PC-9801-61 |
| PC-9801RS-01 | 増設RAMボード | 2MB | PC-9801RS21, etc. | 3 x PC-9801-61 |
| PC-9801CS-01 | 増設RAMボード | 1MB | PC-9801CS | 4 x PC-9801-54 or -61 |
| PC-9801CS-02 | 増設RAMボード | 2MB | ||
| PC-9801DA-01 | 増設RAMボード | 2MB | PC-9801DA | 4 x PC-9801-61 |
| PC-9801DS-01 | 増設RAMボード | 1MB | PC-9801DS | 4 x PC-9801-54 or -61 |
| PC-9801DS-02 | 増設RAMボード | 2MB | ||
| PC-9801DX-01 | 増設RAMボード | 2MB | PC-9801DX | 4 x PC-9801-54 or -61 |
| PC-9801FA-01 | 増設RAMボード(2MB) | 2MB | PC-9801FA | 6 x PC-9801-61 |
| PC-9801FX-01 | 増設RAMボード(2MB) | 2MB | PC-9801FS/FX | 6 x PC-9801-54 or -61 |
| PC-9801FX-11 | 増設RAMボード(4MB) | 4MB | ||
| PC-9801T-01 | 増設RAMボード | 2MB | PC-9801T | 3 x PC-9801-54 or -61 |
| PC-9801T-11 | 増設RAMボード | 4MB | ||
| PC-H98-B02 | 増設RAMボード | 2MB | PC-H98 C-bus slots | 1 x PC-9801-61 |
| PC-H98-B08 | 増設RAMボード | 4MB | Paired 2 x PC-9801-61 | |
| PC-H98-B14 | 増設RAMサブボード(4MB) | 4MB | PC-H98T-B01 | |
| PC-H98/70-B01 | 増設RAMボード | 2MB | PC-H98/60,70,100 | 4 x PC-9801-61 |
| PC-H98/80-B01 | 増設RAMボード | 2MB | PC-H98/80 | 6 x PC-9801-61 |
| PC-H98/80-B02 | 増設RAMボード(4MB) | 4MB | ||
| PC-H98T-B01 | 増設RAMボード | 2MB | PC-H98T | 3 x PC-H98-B14 |
| PC-H98S/8-B01 | 増設RAMボード | 2MB | PC-H98S/8 | 4 x PC-9801-61 |
| SV-H98/30-B01 | 増設RAMボード | 4MB | SV-H98/30 | 2 x PC-9801-61 |
| SV-H98/40-B01 | 増設RAMボード(4MB) | 4MB | SV-H98/30,40 | 2 x PC-9801-61 |
| SV-H98/50F-B01 | 増設RAMボード(32MB) | 32MB | SV-H98/50F | |
| SV-H98/60-B01 | 増設RAMボード(8MB) | 8MB | SV-H98/60 | Paired 2 x SV-H98-B14 |
| SV-H98-B14 | 増設RAMサブボード | 4MB | SV-H98/60-B01 | |
| FC-9801F-01 | 増設RAMボード | 2MB | FC-9801F | 3 x PC-9801-54 or -61 |
| FC-9801S-01 | 増設RAMボード | 2MB | FC-9801S | 4 x PC-9801-54 or -61 |
| PC-9821-B01 | 増設RAMボード | 2MB | PC-9821 model S1,S2 | 4 x PC-9801-54 or -61 |
| PC-9821A-B01 | 増設RAMボード(4MB) | 4MB | PC-9801BA, BX PC-9821Ap, As, Ae |
5 x PC-9801-61 |
| PC-9821AF-B01 | 増設RAMボード(8MB) | 8MB | PC-9821Af | Paired 2 x PC-9821A-B02, etc. |
| PC-9821A2-B01 | 増設RAMボード(4MB) | 4MB | PC-9821Ap2, etc. | 4 x PC-9821A-B02, etc. |
| PC-9821C2-B01 | 増設RAMボード | 0 | PC-9821Ce2,Cs2 | 2 x PC-9821A-B02, etc. |
| PC-9821C2-B02 | 増設RAMボード(4MB) | 4MB | ||
| PC-9821CB-B01 | 増設RAMボード | 0 | PC-9821Cb | 2 x PC-9821A-B02, etc. |
| PC-9821CB-B02 | 増設RAMボード(4MB) | 4MB | ||
| PC-9821CB2-B01 | 増設RAMボード | 0 | PC-9821Cb2 | 2 x PC-9821A-B02, etc. |
| PC-9821CB2-B02 | 増設RAMボード(4MB) | 4MB | ||
| PC-9821CE-B01 | 増設RAMボード(4MB) | 4MB | PC-9821Ce | 4 x PC-9801-61 |
| PC-9821CF-B01 | 増設RAMボード | 0 | PC-9821Cf | 2 x PC-9821XA-B01, etc. |
| PC-9821CX-B01 | 増設RAMボード | 0 | PC-9821Cx | Paired 2 x PC-9821A-B02, etc. |
| PC-9821CX-B02 | 増設RAMボード(4MB) | 4MB | ||
| PC-9801LX-01 | 増設RAMボード | 1MB | PC-9801LX | 2 x PC-9801-54 |
| PC-9801LS-02 | 増設RAMボード | 1MB | PC-9801LS | 2 x PC-9801-54 |
| PC-9801N-01 | 増設RAMカード | 1MB | PC-9801UF,UR,US PC-98DO+ PC-9801N,NV,NL PC-9801NA,NS,NC |
|
| PC-9801N-02 | 増設RAMカード | 2MB | ||
| PC-9801N-03 | 増設RAMカード | 4MB | ||
| PC-9801N-04 | 増設RAMカード | 8MB | ||
| PC-9801NA-02 | 増設RAMボード | 4MB | PC-9801NA | |
| PC-9801NA-03 | 増設RAMボード | 8MB | ||
| PC-9801NS/T-01 | 増設RAMボード | 2MB | PC-9801NS/T | |
| PC-9801NS/R-02 | 増設RAMボード | 2MB | PC-9801NS/R | |
| PC-9801NS/R-03 | 増設RAMボード | 4MB | ||
| PC-9801NS/R-04 | 増設RAMボード | 8MB | ||
| PC-9801NX/C-02 | 増設RAMボード | 2MB | PC-9801NX/C | |
| PC-9801NX/C-03 | 増設RAMボード | 4MB | ||
| PC-9801NX/C-04 | 増設RAMボード | 8MB | ||
| PC-9801NX/C-05 | 増設RAMボード | 12MB | ||
| PC-9821NE-B01 | 増設RAMボード | 4MB | PC-9821Ne PC-9801NS/A |
|
| PC-9821NE-B02 | 増設RAMボード | 8MB | ||
| PC-9821NE-B03 | 増設RAMボード | 12MB | ||
| PC-9801NS/A-02 | 増設RAMボード | 16MB | PC-9821Ne is up to 14.6MB | |
| PC-9821N-B01 | 増設RAMボード(4MB) | 4MB | PC-9821Es PC-9821Np,Ns,Ne2,Nd PC-9821Nf,Nm |
|
| PC-9821N-B02 | 増設RAMボード(8MB) | 8MB | ||
| PC-9821N-B03 | 増設RAMボード(16MB) | 16MB | ||
| PC-9821N-B04 | 増設RAMボード(32MB) | 32MB | ||
| PC-9821LD-B01 | 増設RAMボード | 4MB | PC-9821Ne3,Nd2 PC-9821Na7,Nx PC-9821Ld,Lt,Lt2 PC-9801NL/A |
|
| PC-9821LD-B02 | 増設RAMボード | 8MB | ||
| PC-9821LD-B03 | 増設RAMボード | 16MB | ||
| PC-9821LD-B04 | 増設RAMボード | 32MB | ||
| PC-9821NA9-B01 | 増設RAMボード | 8MB | PC-9821Na9,12,13,15 PC-9821Nb7,10 PC-9821La7,8,10 |
|
| PC-9821NA9-B02 | 増設RAMボード | 16MB | ||
| PC-9821NA9-B03 | 増設RAMボード | 32MB | ||
| PC-9821NA9-B04 | 増設RAMボード | 64MB | ||
| PC-9821NR-B01 | 増設RAMボード | 8MB | PC-9821Nr,Nw,La13,Ls PC-9821Nr150,166,233 PC-9821Nr266,300 |
144pin SO-DIMM/EDO |
| PC-9821NR-B02 | 増設RAMボード | 16MB | ||
| PC-9821NR-B03 | 増設RAMボード | 32MB | ||
| PC-9821NR-B04 | 増設RAMボード | 64MB | Only a few models support. | |
| PK-UG-M009 | 増設RAMボード(16MB) | 16MB | PC-9821Nr150,233 PC-9821Nr266,300 |
144pin SO-DIMM/EDO/SPD |
| PK-UG-M010 | 増設RAMボード(32MB) | 32MB | ||
| PK-UG-M011 | 増設RAMボード(64MB) | 64MB |
Below 640KB (for conventional memory)
| Model number | Name | Size | Supported models | Notes |
|---|---|---|---|---|
| PC-9801-02 | 増設RAMボード | 128KB | C-bus slots(<8MHz) | 1 x PC-9805 expandable. Not supported on V30 CPU 10MHz. Already installed in PC-9801F3, M2, M3. |
| PC-9805 | 増設RAM | 128KB | PC-9801F3/M2/M3 PC-9801-02 |
|
| PC-9801-21 | 増設RAMボード | 128KB | PC-9801U2/UV2/VF PC-9801-31 |
|
| PC-9801-31 | 増設RAMボード | 128KB | C-bus slots | 1 x PC-9801-21 expandable. |
| PC-9801-41 | 増設RAMボード | 256KB | C-bus slots | . |
| PC-98LT-01 | 増設RAMボード | 256KB | PC-98LT | . |
512 KB RAM boards were available from third parties, such as BM-512, HB-512 and HC-512. When you change the amount of the conventional memory, reconfigure the Memory Switches. See Memory Switches [NEC PC98].
EMS memory
| Model number | Name | Size | Supported model | Notes |
|---|---|---|---|---|
| PC-9801-53 | 増設RAMボード | 1MB | C-bus slots | 1 x PC-9801-54 installable |
| PC-9801-54 | 増設RAMサブボード | 1MB | PC-9801-53, etc. | Called "54SIMM", proprietary memory |
They had been supported until the PC-9821An introduced in 1994. On 32-bit machines, you had better use the protected memory and the EMS emulation instead of them.
Bellow table lists EMS memory boards released from third parties.
| Manufacturer | Series | Capacity | EMS | Protected |
|---|---|---|---|---|
| IO DATA | PIO-PC34E series | 1MB-8MB | X | X |
| IO DATA | PIO-PC34H series | 1MB-8MB | X | X |
| IO DATA | PIO-PC34HX series | 1MB-8MB | X | X |
| IO DATA | PIO-PC34F series | 1MB-16MB | X | X |
| IO DATA | PIO-PC34FX series | 1MB-16MB | X | X |
| IO DATA | PIO-PC34N series | 1MB-16MB | X | X |
| IO DATA | PC34R series | 1MB-16MB | X | X |
| MELCO (BUFFALO) | EM series | 0.5MB-2MB | X | |
| MELCO (BUFFALO) | EMA series | 2MB 4MB | X | X |
| MELCO (BUFFALO) | EMJ series | 1MB-16MB | X | X |
| MELCO (BUFFALO) | EMZ series | 0.5MB-1MB | X |
I-O Data's Banked RAM board
There was a proprietary memory developed by IO-DATA Device. It was called banked RAM board (バンクRAMボード). It was supported by some business applications sold in mid-1980s. For details, see I/Oデータ方式バンクRAMボード製品一覧 [PC98] (in Japanese).