2716-pinout 2K x 8 ROM pinout
DIP-24. Keyboard ROM of the IIe and IIc, in a socket drawn for a 2716 EPROM UNVERIFIED
24-pin 2 KB ROM in the 2716 EPROM pinout: /CE on pin 18, A10 on 19, /OE on 20 and VPP on 21, which sits at +5 V to read. Apple draws the IIe keyboard ROM (UE12, schematic 050-0051-D sheet 2) and the IIc keyboard ROM (UD16, schematic 050-0093-A sheet 3/5) as a 2716, with pins 21 and 24 at +5 V; the IIc ties /CE (pin 18) to ground. The fitted part is an Apple-numbered 342-0132 (an AMI part on the photographed IIe), not an Intel 2716. No data sheet for it was found, so its own select polarities are unchecked: the pin table is the 2716 interface the boards are drawn for. A 2716 EPROM programmed with the same contents is the type the boards expect. A 2316B mask ROM has mask-set selects on pins 18, 20 and 21 and needs the matching mask.
Open the interactive 2716 pinoutPins
| Pin | Name | Type | Signal |
|---|---|---|---|
| 1 | A7 | addr | Address bit 7. |
| 2 | A6 | addr | Address bit 6. |
| 3 | A5 | addr | Address bit 5. |
| 4 | A4 | addr | Address bit 4. |
| 5 | A3 | addr | Address bit 3. |
| 6 | A2 | addr | Address bit 2. |
| 7 | A1 | addr | Address bit 1. |
| 8 | A0 | addr | Address bit 0. |
| 9 | O0 | data | Data output 0. |
| 10 | O1 | data | Data output 1. |
| 11 | O2 | data | Data output 2. |
| 12 | GND | ground | Ground. |
| 13 | O3 | data | Data output 3. |
| 14 | O4 | data | Data output 4. |
| 15 | O5 | data | Data output 5. |
| 16 | O6 | data | Data output 6. |
| 17 | O7 | data | Data output 7. |
| 18 | /CE | ctrl | Chip enable, active LOW (the program pulse input on an EPROM). Tied to ground on the IIc. |
| 19 | A10 | addr | Address bit 10. |
| 20 | /OE | ctrl | Output enable, active LOW. |
| 21 | VPP | power | Programming voltage on an EPROM; +5 V to read. Tied to +5 V on the IIe and IIc. |
| 22 | A9 | addr | Address bit 9. |
| 23 | A8 | addr | Address bit 8. |
| 24 | VCC | power | +5 V supply. |