250469 (E)
- PCB Assembly Number 250469.
- Schematic Number 252312.
- KERNAL & BASIC ROMS combined into U4.
- New IC memory controller, U8.
- In 1987, Commodore released C64Cs with a highly redesigned motherboard commonly known as a “short board”.
- The “short board” used the new HMOS chipset, featuring a new 64-pin PLA chip. The new “SuperPLA”, as it was dubbed, integrated many discrete components and Transistor–Transistor Logic (TTL) chips.
- In the last revision of the C64C motherboard, the 2114 color RAM was integrated into the SuperPLA.
Integrated Circuits
| PCB Identifier | Chip Number | Remarks | Memory Location/bit |
|---|---|---|---|
| U1 | 6526 | CIA 1 | $DC00-$DCFF |
| U2 | 6526 | CIA 2 | $DD00-$DDFF |
| U3 | 74LS08 | ||
| U4 | 23128 | Basic and Kernal ROM | $A000-$BFFF $E000-$FFFF |
| U5 | 2332 | Character ROM | $D000-$DFFF |
| U6 | 8500 | CPU | |
| U7 | 8562(NTSC)/8565 (PAL) | VIC-II | $D000-$D3FF |
| U8 | 251715-01 252535-01 (Rev B) | PLA | |
| U9 | 8580 | SID | $D400-$D7FF |
| U10 | 41464 | DRAM 64Kx1 | D0..D3 |
| U11 | 41464 | DRAM 64Kx1 | D4..D7 |
| U18 | 4066 | Quad Bilateral Switch | |
| U19 | 2114 (not on Rev B.) | SRAM 1Kx4 | $D800-$DBFF |
| U20 | 8701 | Oscillator | |
| U21 | 4066 | Quad Bilateral Switch | |
| U22 | 7404 | inverter | |
| U23 | 7404 | inverter |
Schematics
Board Image
Rev B, Without color ram