Board 250477 C128DCR

250477

  • Released in 1986
  • PCB Number 250477.
  • Schematic Number 252451.
  • The Board has an improved 80 column mode video chip over the normal C128
  • the integrated 1571 drive is less compatible than the stand alone 1571 as the WD1770 and CIA are combined in one chip

Integrated Circuits

U16526
CIA 1$DC00
U24066Quad Bilateral Switch
U374LS138Decoder/demultiplexer
U46526
CIA 2$DD00
U58580SID$D400
U68502CPU 6 MHz
U78722MMU$D500
U974F32Quad 2-input or gate
U10Z80BCPU 6 MHz
U118721PAL
U1774ALS373Octal Latch
U182364Char ROM$D000-$DFFF
U1920162k x * SRAM$D800
U204066Quad Bilateral Switch
U218564 NTSC
8566 PAL
VIC II$D000
U22856880 COL CRT CNTRL$D600
U23446464K x 4 DRAM VideoD0-D3
U25446464K x 4 DRAM VideoD4-D7
U27NE556Dual Timer
U288701Clock Generator
U3227256ROM Basic$4000-$BFFF
U3427256c64 kernal and basic + c128 kernalC64
$A000-$BFFF
$E000-$FFFF
C128
$C000-$CFFF
$E000-$FFFF
U3623256Function Mem/Rom
U384125464K x 4 DRAMD0-D3
U394125464K x 4 DRAMD4-D7
U404125464K x 4 DRAMD0-D3
U414125464K x 4 DRAMD4-D7
U5574F245Octal bus transceiver
U10227256ROM DRIVE$8000-$FFFF
U10320162k x * SRAM$0000-$07FF
U1046522AVIA 1 $1800-$180F
U1066522AVIA 2$1C00-$1C0F
U1075710FDC (intergrated WD1770 and CIA)$2000-$2005
$400C-$400E
$4010-$4017
U108CX20185/MC28719/LA8200FDD R/W AMP
U109UPA2003CNEC

Schematics

I/O – Control Ports, Keyboard, User Port, Serial Port, Cassette Port Schematic 252451, sheet 1 of 5

I/O – Control Ports, Keyboard, User Port, Serial Port, Cassette Port
Schematic 252451, sheet 1 of 5

Microprocessors, MMU, SID, PLA, power supply Schematic 252451, sheet 2 of 5

Microprocessors, MMU, SID, PLA, power supply
Schematic 252451, sheet 2 of 5

Video, Clock, Reset Schematic 252451, sheet 3 of 5

Video, Clock, Reset
Schematic 252451, sheet 3 of 5

RAM, ROM Schematic 252451, sheet 4 of 5

RAM, ROM
Schematic 252451, sheet 4 of 5

FDD Controler Schematic 252451, sheet 5 of 5

FDD Controler
Schematic 252451, sheet 5 of 5

 

Board Image

Mainboard C128DCR board 250477

Mainboard C128DCR board 250477 [1]

[1] image source Ray Carlsen’s Home Page

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