310379
- Released in 1985
- PCB Number 310379.
- Schematic Number 310378.
- The Board has 2 revisions (Revision 6 and 7)
- Mainboard is used in the normal C128 and in the C128D (With integrated 1571 drive)
Integrated Circuits
| PCB Identifier | Chip Number | Remarks | Memory Location/bit |
|---|---|---|---|
| U1 | 6526 | CIA 1 | $DC00 |
| U2 | 4066 | Quad Bilateral Switch | |
| U3 | 74LS138 | Decoder/demultiplexer | |
| U4 | 6526 | CIA 2 | $DD00 |
| U5 | 6581 | SID | $D400 |
| U6 | 8502 | CPU | |
| U7 | 8722-R1 | MMU | $D500 |
| U8 | 74LS08 | Logic AND | |
| U9 | 74F32 | Quad 2-input or gate | |
| U10 | Z80B | CPU 6Mhz | |
| U11 | 8721-R3 | PLA | |
| U12 | 74LS373 | Octal Latch | |
| U13 | 74LS244 | Octal 3-state buffer | |
| U14 | 74LS257A | Multiplexer | |
| U15 | 74LS257A | Multiplexer | |
| U16 | 74LS14 | HEX inverter schmitt trigger | |
| U17 | 74ALS373 | Octal Latch | |
| U18 | 2364 | 128 Char (8K x 8) | $D000-$DFFF |
| U19 | 2016 | 2K x 8 SRam color | $D800 |
| U20 | 4066 | Quad Bilateral Switch | |
| U21 | 8564-R4 (NTSC) 8566-R4 (PAL) | VIC II | $D000 |
| U22 | 8563-R7 | CRT Cntrl | $D600 |
| U23 | 4416 | 16K x 4 DRam CRT video ram | D0-D3 |
| U24 | 74LS244 | Octal 3-state buffer | |
| U25 | 4416 | 16K x 4 DRam CRT video ram | D4-D7 |
| U26 | 74LS257A | Multiplexer | |
| U27 | 556 | Dual Timer | |
| U28 | 8701C | Clock Generator | |
| U29 | 7406 | HEX Inverter Buffer | |
| U30 | 7406 | HEX Inverter Buffer | |
| U31 | 74LS00 | Quad 2-input nand gate | |
| U32 | 23128 | C64 Kern & Basic (16K x 8) | $A000-$BFFF $E000-$FFFF |
| U33 | 23128 | Basic (16K x 8) | $4000-$7FFF |
| U34 | 23138 | Basic (16K x 8) | $8000-$BFFF |
| U35 | 23128 | Kernal & 40/80 Col Editor (16K x 8) | $C000-$CFFF $E000-$FFFF |
| U36 | 23256 | Function (32K x 8) | $8000-$FFFF |
| U37 | 7406 | HEX Inverter Buffer | |
| U38 | 4164 | 64K x 1 DRAM | D0 |
| U39 | 4164 | 64K x 1 DRAM | D1 |
| U40 | 4164 | 64K x 1 DRAM | D2 |
| U41 | 4164 | 64K x 1 DRAM | D3 |
| U42 | 4164 | 64K x 1 DRAM | D4 |
| U43 | 4164 | 64K x 1 DRAM | D5 |
| U44 | 4164 | 64K x 1 DRAM | D6 |
| U45 | 4164 | 64K x 1 DRAM | D7 |
| U46 | 4164 | 64K x 1 DRAM | D0 |
| U47 | 4164 | 64K x 1 DRAM | D1 |
| U48 | 4164 | 64K x 1 DRAM | D2 |
| U49 | 4164 | 64K x 1 DRAM | D3 |
| U50 | 4164 | 64K x 1 DRAM | D4 |
| U51 | 4164 | 64K x 1 DRAM | D5 |
| U52 | 4164 | 64K x 1 DRAM | D6 |
| U53 | 4164 | 64K x 1 DRAM | D7 |
| U54 | 74LS32 | Quad 2-input or gate | |
| U55 | 74F245 | Octal bus transceiver | |
| U56 | 74LS74 | Dual D-type flip flop | |
| U57 | 7407 | HEX Buffer | |
| U58 | 74LS03 | Quad 2-input nand gate | |
| U59 | 7812 | 12Volt Regulator | |
| U60 | 7407 | HEX Buffer | |
| U61 | 74LS08 | Quad 2-input and gate | |
| U62 | 74LS244 | Octal 3-state buffer | |
| U63 | 7406 (REV 7 only) | HEX Inverter Buffer |
Schematics
Schematic 310378 rev. 6, sheet 1 of 4
Schematic 310378 rev. 6, sheet 2 of 4
Schematic 310378 rev. 6, sheet 3 of 4
Schematic 310378 rev. 6, sheet 4 of 4
Schematic 310378 rev. 7, sheet 1 of 4
Schematic 310378 rev. 7A, sheet 2 of 4
Schematic 310378 rev. 7A, sheet 3 of 4
Schematic 310378 rev. 7, sheet 4 of 4
Board Image
Rev 6. no IC U63 (Top Left above CIA 1)
Rev 7.