C128(D) Assembly 310379

  • Released in 1985.
  • Schematic Number 310378.
  • There are two revisions: Revision 6 and Revision 7.
  • Mainboard is used in the C128 and C128D (Not the C128DCR).

Specs

  • CPU : 8502 @ 1–2 MHz / Zilog Z80A, or Zilog Z80B @ 4 MHz
  • RAM : 128kB DRAM
  • ROM (C64 Mode) : 16kB ROM Total - 8k BASIC, 8k Kernal
  • ROM (C128 Mode) : 64kB ROM Total - 48k BASIC, 16k Kernal, 16k C128 BIOS
  • ROM (CP/M) : 4kB CPM/BIOS
  • Graphics : VIC-II (40 col mode) / VDC-8563 (80 col mode)
  • Sound : SID
  • Interfaces : 2 Control Ports, A/V, RGBI, Datasette Port, Expansion Port, Serial IEC, TV RF, User Port
  • Keyboard : 92 Keys
  • Power Supply : External Transformer (9V AC + 5V DC)

Schematics

Fig. 1: C128 310379 Mainboard Fig. 2: C128 310379 Rev 6 Layout Fig. 3: C128 310379 Rev 7 Layout

Capacitor List

Revision 6

Cap   -  Value   - Rating - Type
C61   -  10uf    -  16v   - Radial
C62   -  10uf    -  16v   - Radial
C63   -  10uf    -  16v   - Radial
C69   -  10uf    -  16v   - Radial
C80   -  2.2uf   -  25v   - Radial
C85   -  10uf    -  16v   - Radial
C88   -  10uF    -  16v   - Radial
C91   -  1uf     -  50v   - Radial
C92   -  10uf    -  16v   - Radial
C101  -  10uf    -  35v   - Radial
C104  -  220uf   -  50v   - Radial
C105  -  330uf   -  50v   - Radial
C106  -  1000uf  -  25v   - Axial
C107  -  100uF   -  16v   - Radial
C111  -  10uF    -  16v   - Radial

Revision 7

Cap   -  Value   - Rating - Type
C61   -  10uf    -  16v   - Radial
C62   -  10uf    -  16v   - Radial
C63   -  100uf   -  6.3v  - Radial
C80   -  2.2uf   -  25v   - Radial
C85   -  10uf    -  16v   - Radial
C88   -  10uF    -  16v   - Radial
C91   -  1uf     -  50v   - Radial
C92   -  10uf    -  16v   - Radial
C101  -  10uf    -  35v   - Radial
C104  -  220uf   -  50v   - Radial
C105  -  330uf   -  50v   - Radial
C106  -  1000uf  -  25v   - Axial
C107  -  100uF   -  16v   - Radial
C111  -  10uF    -  16v   - Radial

Purchase these caps in a kit from our store

IC List

PCB ID Chip ID Notes
U1 6526 CIA 1
U2 4066 Quad Bi-Switch
U3 74LS139 Demultiplexor
U4 6526 CIA 2
U5 6581 SID
U6 8502 Processor
U7 8722 MMU
U8 74LS08 Logic AND
U9 74F32 Quad 2-Input Gate
U10 Z80B Processor
U11 8721-R3 PLA
U12 74LS373 Octal Latch
U13 74LS244 Octal 3-State Buffer
U14 74LS257A Multiplexor
U15 74LS257A Multiplexor
U16 74LS14 Hex Inverter
U17 74ALS373 Octal Latch
U18 2364 ROM - Char
U19 2016 SRAM
U20 4066 Quad Bi-Switch
U21 8564/8566 VIC-II
U22 8563 CRT Control
U23 4416 DRAM - CRT
U24 74LS244 Octal 3-State Buffer
U25 4416 DRAM - CRT
U26 74LS257A Multiplexor
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 ROM - Kernal & Basic
PCB ID Chip ID Notes
U33 23128 ROM - Basic
U34 23128 ROM - Basic
U35 23128 ROM - Kernal & 40/80 Col
U36 23256 ROM - Function
U37 7406 Hex Inverter Buffer
U38 4164 DRAM
U39 4164 DRAM
U40 4164 DRAM
U41 4164 DRAM
U42 4164 DRAM
U43 4164 DRAM
U44 4164 DRAM
U45 4164 DRAM
U46 4164 DRAM
U47 4164 DRAM
U48 4164 DRAM
U49 4164 DRAM
U50 4164 DRAM
U51 4164 DRAM
U52 4164 DRAM
U53 4164 DRAM
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 12v Regulator
U60 7407 HEX Buffer
U61 74LS08 Quad 2-Input AND Gate
U62 74LS244 Octal 3-State Buffer
U63 7406 (Rev 7) HEX Inverter Buffer

Downloads

C128 Service Manual



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