Board 250469 E

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 NumberRemarks Memory Location/bit
U1 6526
CIA 1$DC00-$DCFF
U26526
CIA 2$DD00-$DDFF
U374LS08
U423128Basic and Kernal ROM$A000-$BFFF
$E000-$FFFF
U52332Character ROM$D000-$DFFF
U68500CPU
U78562 (NTSC)/8565 (PAL)VIC-II$D000-$D3FF
U8251715-01
252535-01 (Rev B)
PLA
U98580SID$D400-$D7FF
U1041464 DRAM 64Kx1D0..D3
U1141464DRAM 64Kx1D4..D7
U184066Quad Bilateral Switch
U192114 (not on Rev B.)SRAM 1Kx4$D800-$DBFF
U208701Oscillator
U214066Quad Bilateral Switch
U227404inverter
U237404inverter

Schematics
252312
Board Image
board 250469
C64Cmotherboard
Rev B, Without color ram