2513 character generator ROM (64 x 8 x 5) pinout
DIP-24. Character generator: the 64 upper-case 5 x 7 dot patterns for 40-column text
A 2560-bit ROM organized as 512 words of 5 bits. It holds the 64 upper-case 5 x 7 characters, and a 74166 at A3 turns each row of 5 dots into the video bit stream. A bad 2513 gives wrong or missing characters in text mode while lo-res and hi-res graphics still look right. The General Instrument RO-3-2513 runs from +5 V only; its data sheet says it replaces the Signetics 2513/CM2140 pin for pin. Whether the Apple II socket also feeds supply pins that the GI part leaves unconnected was not checked.
Open the interactive 2513 pinoutPins
| Pin | Name | Type | Signal |
|---|---|---|---|
| 1 | NC | nc | Not connected on the GI RO-3-2513. UNVERIFIED |
| 2 | NC | nc | Not connected on the GI RO-3-2513. UNVERIFIED |
| 3 | NC | nc | Not connected on the GI RO-3-2513. UNVERIFIED |
| 4 | O1 | data | Dot output 1 (three-state). |
| 5 | O2 | data | Dot output 2 (three-state). |
| 6 | O3 | data | Dot output 3 (three-state). |
| 7 | O4 | data | Dot output 4 (three-state). |
| 8 | O5 | data | Dot output 5 (three-state). |
| 9 | NC | nc | Not connected on the GI RO-3-2513. UNVERIFIED |
| 10 | GND | ground | Ground. |
| 11 | OUT INH | ctrl | Output inhibit: HIGH floats the outputs. |
| 12 | NC | nc | Not connected on the GI RO-3-2513. UNVERIFIED |
| 13 | NC | nc | Not connected on the GI RO-3-2513. UNVERIFIED |
| 14 | A1 | addr | Address input 1. |
| 15 | A2 | addr | Address input 2. |
| 16 | A3 | addr | Address input 3. |
| 17 | A4 | addr | Address input 4. |
| 18 | A5 | addr | Address input 5. |
| 19 | A6 | addr | Address input 6. |
| 20 | A7 | addr | Address input 7. |
| 21 | A8 | addr | Address input 8. |
| 22 | A9 | addr | Address input 9. |
| 23 | NC | nc | Not connected on the GI RO-3-2513. UNVERIFIED |
| 24 | VCC | power | +5 V supply. |
Fitted in
- Apple II A5 (Apple II Reference Manual, p. 96); the photographed board has a General Instrument RO-3-2513/CGR-001