EPROM Sizes and Types
EPROMs come in several sizes both in physical packaging as well and storage capacity. While parts of the same type number from different manufacturers are compatible as long as they're only being read, there are subtle differences in the programming process.
Most EPROMS could be identified by the programmer through "signature mode" by forcing 12V on pin A9 and reading out two bytes of data. However, as this was not universal, programmer software also would allow manual setting of the manufacturer and device type of the chip to ensure proper programming.
| EPROM Type | Year | Size — bits | Size — bytes | Length (hex) | Last address (hex) |
|---|---|---|---|---|---|
| 1702, 1702A | 1971 | 2 Kbit | 256 | 100 | FF |
| 2704 | 1975 | 4 Kbit | 512 | 200 | 1FF |
| 2708 | 1975 | 8 Kbit | 1 KB | 400 | 3FF |
| 2716, 27C16, TMS2716, 2516 | 1977 | 16 Kbit | 2 KB | 800 | 7FF |
| 2732, 27C32, 2532 | 1979 | 32 Kbit | 4 KB | 1000 | FFF |
| 2764, 27C64, 2564 | 64 Kbit | 8 KB | 2000 | 1FFF | |
| 27128, 27C128 | 128 Kbit | 16 KB | 4000 | 3FFF | |
| 27256, 27C256 | 256 Kbit | 32 KB | 8000 | 7FFF | |
| 27512, 27C512 | 512 Kbit | 64 KB | 10000 | FFFF | |
| 27C010, 27C100 | 1 Mbit | 128 KB | 20000 | 1FFFF | |
| 27C020 | 2 Mbit | 256 KB | 40000 | 3FFFF | |
| 27C040, 27C400 | 4 Mbit | 512 KB | 80000 | 7FFFF | |
| 27C080 | 8 Mbit | 1 MB | 100000 | FFFFF | |
| 27C160 | 16 Mbit | 2 MB | 200000 | 1FFFFF | |
| 27C320 | 32 Mbit | 4 MB | 400000 | 3FFFFF |
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