System Memory: RNA, RNB and RNC

The PAT48AN countains four 30-pin SIMM sockets for 9-bit modules (256Kx9, 1Mx9, 16Mxp SIMMs) and two 72-pin SIMM sockets 36-bit modules (1Mx36, 2Mx36, 4Mx36, 8Mx36, 16Mx36 and 32Mx36).

Note : 1M x 36 SIMM = 4 of 1M x 9 SIMM
2M x 36 SIMM = 8 of 1M x 9 SIMM
4M x 36 SIMM = 4 of 4M x 9 SIMM
8M x 36 SIMM = 8 of 4M x 9 SIMM
16M x 36 SIMM = 4 of 16M x 9 SIMM
32M x 36 SIMM = 8 of 16M x 9 SIMM

The memory banks of the PAT48AN, depending on the users requirements, can be ASSIGNED and/or REASSIGNED by installing RNs (Resistor Networks) into 10-pin RN sockets, RNA, RNB and RNC.

Note : If changing the number of memory banks JP10 and JP11 may have to be changed.

Using "36-bit" SIMM sockets as Bank 0 & 1 and "9-bit" SIMM sockets as bank 2.

SocketTypeBank
M172 pin0
M272 pin1
SIM130 pin2
SIM230 pin2
SIM330 pin2
SIM430 pin2
Bank assignments with RNA insrtalled

Bank0
M1 (single)		 Bank1
M2 (single)		 Bank2
SIM1-4		 Total
Memory
1M x 36 X X 4M
1M x 36 1M x 36 X 8M
1M x 36 1M x 36 1M x 9 12M
4M x 36 X X 16M
1M x 36 4M x 36 X 20M
1M x 36 1M x 36 4M x 9 24M
1M x 36 4M x 36 1M x 9 24M
4M x 36 4M x 36 X 32M
1M x 36 4M x 36 4M x 9 36M
4M x 36 4M x 36 1M x 9 36M
4M x 36 4M x 36 4M x 9 48M
16M x 36 X X 64M
1M x 36 1M x 36 16M x 9 72M
4M x 36 16M x 36 X 80M
1M x 36 4M x 36 16M x 9 84M
4M x 36 16M x 36 1M x 9 84M
4M x 36 4M x 36 16M x 9 96M
4M x 36 16M x 36 4M x 9 96M
16M x 36 16M x 36 X 128M
Memory configuration with RNA installed.

Note : A bank consists one 36-bit SIMM for banks 0 and 1. Bank 2 consists of four 9-bit SIMMs.

Using "9-bit" SIMM sockets as Bank 0 and "36-bit" SIMM sockets as bank 1 & 2.

SocketTypeBank
M172 pin2
M272 pin1
SIM130 pin0
SIM230 pin0
SIM330 pin0
SIM430 pin0
Bank assignments with RNB insrtalled

Bank0
M1 (single)		 Bank1
M2 (single)		 Bank2
SIM1-4		 Total
Memory
1M x 36 X X 4M
1M x 36 1M x 36 X 8M
1M x 36 1M x 36 1M x 9 12M
4M x 36 X X 16M
1M x 36 4M x 36 X 20M
1M x 36 1M x 36 4M x 9 24M
1M x 36 4M x 36 1M x 9 24M
4M x 36 1M x 36 1M x 9 24M
4M x 36 4M x 36 X 32M
1M x 36 4M x 36 4M x 9 36M
4M x 36 4M x 36 1M x 9 36M
4M x 36 4M x 36 4M x 9 48M
16M x 36 X X 64M
1M x 36 1M x 36 16M x 9 72M
4M x 36 16M x 36 X 80M
1M x 36 4M x 36 16M x 9 84M
4M x 36 16M x 36 1M x 9 84M
4M x 36 4M x 36 16M x 9 96M
4M x 36 16M x 36 4M x 9 96M
16M x 36 16M x 36 X 128M
Memory configuration with RNB installed.

Using "36-bit" SIMM

The "36-bit" SIMM sockets, M1 and M2, can also accept DUAL Density SIMMs. A dual density SIMM is equivalent to eight pices of "9-bit" SIMMs (also equivalent to 2 memory banks).
Eg. 2M x 36 SIMM == 8 * (1M x 9) SIMMs

SocketTypeBank
M172 pin0 & 1
M272 pin2 & 3
SIM130 pin2
SIM230 pin2
SIM330 pin2
SIM430 pin2
Bank assignments with RNC insrtalled

M1 Socket M2 Socket Total
Memory
Bank0 Bank1 Bank2 Bank3
1M x 36 X X X 4M
2M x 36
 X X 8M
2M x 36
 1M x 36 X 12M
2M x 36
2M x 36
 16M
4M x 36 X X X 16M
2M x 36
 4M x 36 X 24M
8M x 36
 X X 32M
8M x 36
 1M x 36 X 36M
2M x 36
8M x 36
 40M
8M x 36
2M x 36
 40M
8M x 36
 4M x 36 X 48M
8M x 36
8M x 36
 64M
16M x 36 X X X 64M
2M x 36
 16M x 36 X 72M
8M x 36
 16M x 36 X 96M
32M x 36
 X X 128M
M1 Socket SIM1-4 Total
Memory
Bank0 Bank1 Bank2
2M x 36
1M x 9
 12M
2M x 36
4M x 9
 24M
8M x 36
1M x 9
 36M
8M x 36
4M x 9
 48M
2M x 36
16M x 9
 72M
8M x 36
16M x 9
 96M
Memory configuration with RNC installed.

Contrary to what the manual states, Holger Reif has succeded in using FP SIMMs (16M, 70 ns, w/o parity).

Last updated 1998/09/12 18:30:34