Difference between pages "NS23M" and "National Semiconductor NS23M QBUS memory"
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| − | + | The '''National Semiconductor NS23M''' is a [[QBUS]] memory card in [[DEC card form factor|dual]] QBUS card-size format. It can be configured to use either 16Kx1, 32Kx1 or 64Kx1 [[DRAM]]s, operating at 150nsec or 200nsec; it has a maximum capacity of 256 Kbyte (using 64Kx1 DRAMs). | |
| + | |||
| + | == Configuration== | ||
| + | |||
| + | The board is configured with a combination of jumpers and DIP switches. | ||
| + | |||
| + | {| class="wikitable" | ||
| + | ! Jumper(s) !! Function | ||
| + | |- | ||
| + | | W1-W2, W17-W18 || 200ns/150ns DRAM | ||
| + | |- | ||
| + | | W3-W4 || Test | ||
| + | |- | ||
| + | | W5-W7, W12 || 16K/32K/64K DRAM | ||
| + | |- | ||
| + | | W8-W9 || Test | ||
| + | |- | ||
| + | | W10-W11 || Internal/External Refresh | ||
| + | |- | ||
| + | | W13-W14 || 32K DRAM Upper/Lower | ||
| + | |- | ||
| + | | W15 || 18-/22-bit QBUS (in/out) | ||
| + | |- | ||
| + | | W16 || External Refresh / MEMSEL | ||
| + | |- | ||
| + | | W19-W20 || Battery Backup | ||
| + | |} | ||
| + | |||
| + | ===Starting Address=== | ||
| + | |||
| + | {| class="wikitable" | ||
| + | ! Switch !! Address bit | ||
| + | |- | ||
| + | | S1-1 || 20000 | ||
| + | |- | ||
| + | | S1-2 || 40000 | ||
| + | |- | ||
| + | | S1-3 || 100000 | ||
| + | |- | ||
| + | | S1-4 || 200000 | ||
| + | |- | ||
| + | | S1-5 || 400000 | ||
| + | |- | ||
| + | | S1-6 || 1000000 | ||
| + | |- | ||
| + | | S1-7 || 2000000 | ||
| + | |- | ||
| + | | S1-8 || 4000000 | ||
| + | |- | ||
| + | | S1-9 || 10000000 | ||
| + | |} | ||
| + | |||
| + | ===Size=== | ||
| + | |||
| + | {| class="wikitable" | ||
| + | ! Jumper(s) !! Function | ||
| + | |- | ||
| + | | S2-1 || 16KB | ||
| + | |- | ||
| + | | S2-2 || 32KB | ||
| + | |- | ||
| + | | S2-3 || 64KB | ||
| + | |- | ||
| + | | S2-4 || 128KB | ||
| + | |- | ||
| + | | S1-10 || 2K/4K I/O Address Space (closed/open) | ||
| + | |} | ||
| + | |||
| + | Note that the size is the value indicated, plus 16KB (the minimum); i.e. 0000 = 16KB, 1111 = 256KB. | ||
Revision as of 15:50, 4 March 2017
The National Semiconductor NS23M is a QBUS memory card in dual QBUS card-size format. It can be configured to use either 16Kx1, 32Kx1 or 64Kx1 DRAMs, operating at 150nsec or 200nsec; it has a maximum capacity of 256 Kbyte (using 64Kx1 DRAMs).
Configuration
The board is configured with a combination of jumpers and DIP switches.
| Jumper(s) | Function |
|---|---|
| W1-W2, W17-W18 | 200ns/150ns DRAM |
| W3-W4 | Test |
| W5-W7, W12 | 16K/32K/64K DRAM |
| W8-W9 | Test |
| W10-W11 | Internal/External Refresh |
| W13-W14 | 32K DRAM Upper/Lower |
| W15 | 18-/22-bit QBUS (in/out) |
| W16 | External Refresh / MEMSEL |
| W19-W20 | Battery Backup |
Starting Address
| Switch | Address bit |
|---|---|
| S1-1 | 20000 |
| S1-2 | 40000 |
| S1-3 | 100000 |
| S1-4 | 200000 |
| S1-5 | 400000 |
| S1-6 | 1000000 |
| S1-7 | 2000000 |
| S1-8 | 4000000 |
| S1-9 | 10000000 |
Size
| Jumper(s) | Function |
|---|---|
| S2-1 | 16KB |
| S2-2 | 32KB |
| S2-3 | 64KB |
| S2-4 | 128KB |
| S1-10 | 2K/4K I/O Address Space (closed/open) |
Note that the size is the value indicated, plus 16KB (the minimum); i.e. 0000 = 16KB, 1111 = 256KB.
