C128DCR Assembly 250477

• Released in 1986.
• Schematic Number 252451.
• Mainboard used in the low cost version of the C128D (C128DCR).
• Plastic case instead of a metal case like the C128D.
• Improved 80 column mode video chip.

• 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 (External)
• Power Supply : External Transformer (9V AC + 5V DC)

Fig. 1: C128DCR 250477 Mainboard

Cap   -  Value   - Rating - Type
C35   -  4.7uf   -  50v   - Radial
C61   -  10uf    -  16v   - Radial
C63   -  100uf   -  6.3v  - Radial
C69   -  10uf    -  25v   - Radial
C85   -  10uf    -  25v   - Radial
C88   -  1000uf  -  25v   - Axial
C91   -  1uf     -  50v   - Radial
C92   -  10uf    -  25v   - Radial
C100  -  220uf   -  16v   - Axial
C109  -  10uf    -  25v   - Radial
C115  -  10uf    -  25v   - Radial
C140  -  1uf     -  50v   - Radial  -  Non-Polar
C141  -  1uf     -  50v   - Radial  -  Non-Polar