| IC function: | 256 kbit (64k×4) DRAM |
| Related components: | 64 kbit (16k×4) DRAM, 1 Mbit (256k×4) DRAM, 4 Mbit (1M×4) DRAM |
| IC number | Manufacturer | Documentation |
|---|---|---|
| HM50464 | Hitachi | Not available |
| MB81464 | Fujitsu | Not available |
| D41464 | NEC | Not available |
| TMS4464 | Texas Instruments | Not available |
| LH2464 | Sharp | Not available |
| M41464 | Oki | Not available |
| MN41464A | Panasonic | Not available |
| IC number | Access time | Package |
|---|---|---|
| HM50464P-15, MB81464-15, D41464C-15, TMS4464JL-15, TMS4464NL-15 | 150 ns | 18-pin DIP |
| LH2464-12, M41464-12 | 120 ns | 18-pin DIP |
| D41464C-10, TMS4464-10NL | 100 ns | 18-pin DIP |
| MN41464A-80 | 80 ns | 18-pin DIP |
| MN41464AZ-80 | 80 ns | 20-pin ZIP |
| CBM part number | CBM part description |
|---|---|
| 390083-02 | MEM DRAM 64KX4 BIT 150NS |
| 390083-04 | 64K X 4 DRAMs 100ns |
| 390083-05 | 64K X 4 DRAMs 80ns |
| 390083-07 | 64 X 4 D-RAM |
| 380256-01 | DRAM 64K X 4, 120 ns |
| Device | Positions | Positions (not installed) | Package | Access time |
|---|---|---|---|---|
| A1000 main board | U1B..U1E, U2B..U2E | DIP | 150 ns | |
| A1000 piggyback board | U1B..U1E, U2B..U2E | DIP | 150 ns | |
| A1050 RAM expansion | U1..U8 | DIP | 150 ns | |
| A1060 interface board | U19..U22 | DIP | 150 ns | |
| A2088 | U32..U35 | DIP | 150 ns | |
| A2286 main board | U62..U65 | DIP | 150 ns | |
| A2386 | U406..U409 | ZIP | 80 ns | |
| PC-I | U66, U67 | DIP | 150 ns | |
| PC10 256k RAM expander | U12..U15 | DIP | 150 ns | |
| PC10 384k RAM expander | U12..U15 | DIP | 150 ns | |
| PC10-III Rev. 5 or 6 | U605, U606 | DIP | 100 ns | |
| PC10-III Rev. 5 | U321..U324 | DIP | 100 ns | |
| PC10-III Rev. 6 | U309..U312 | DIP | 120 ns | |
| PC30-III | U709, U710, U713, U714 | DIP | 100 ns | |
| PC40-III | U118..U125 | DIP | 100 ns | |
| PC60-III | U114, U115, U121, U122, U130, U131, U136, U137 | DIP | 100 ns | |
| C64C | U10, U11 | DIP | 150 ns | |
| C128DCR | U23, U25, U38..U41 | DIP | 150 ns |
| Pin | Type | Name |
|---|---|---|
| 1 | Input | _OE |
| 2..3 | I/O | Data |
| 4 | Input | _WE |
| 5 | Input | _RAS |
| 6..8 | Input | Address |
| 9 | Power | VCC |
| 10..14 | Input | Address |
| 15 | I/O | Data |
| 16 | Input | _CAS |
| 17 | I/O | Data |
| 18 | Power | GND |
| Pin | Type | Name |
|---|---|---|
| 1 | I/O | Data |
| 2 | Input | _CAS |
| 3 | I/O | Data |
| 4 | Power | GND |
| 5 | Input | _OE |
| 6..7 | I/O | Data |
| 8 | Input | _WE |
| 9 | Input | _RAS |
| 10..11 | N/C | NC |
| 12..14 | Input | Address |
| 15 | Power | VCC |
| 16..20 | Input | Address |