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

U1	6526	CIA 1	$DC00
U2	4066	Quad Bilateral Switch
U3	74LS138	Decoder/demultiplexer
U4	6526	CIA 2	$DD00
U5	8580	SID	$D400
U6	8502	CPU 6 MHz
U7	8722	MMU	$D500
U9	74F32	Quad 2-input or gate
U10	Z80B	CPU 6 MHz
U11	8721	PLA
U17	74ALS373	Octal Latch
U18	2364	Char ROM	$D000-$DFFF
U19	2016	2k x * SRAM	$D800
U20	4066	Quad Bilateral Switch
U21	8564 NTSC 8566 PAL	VIC II	$D000
U22	8568	80 COL CRT CNTRL	$D600
U23	4464	64K x 4 DRAM Video	D0-D3
U25	4464	64K x 4 DRAM Video	D4-D7
U27	NE556	Dual Timer
U28	8701	Clock Generator
U32	27256	ROM Basic	$4000-$BFFF
U34	27256	c64 kernal and basic + c128 kernal	C64 $A000-$BFFF $E000-$FFFF C128 $C000-$CFFF $E000-$FFFF
U36	23256	Function Mem/Rom
U38	41254	64K x 4 DRAM	D0-D3
U39	41254	64K x 4 DRAM	D4-D7
U40	41254	64K x 4 DRAM	D0-D3
U41	41254	64K x 4 DRAM	D4-D7
U55	74F245	Octal bus transceiver
U102	27256	ROM DRIVE	$8000-$FFFF
U103	2016	2k x * SRAM	$0000-$07FF
U104	6522A	VIA 1	$1800-$180F
U106	6522A	VIA 2	$1C00-$1C0F
U107	5710	FDC (intergrated WD1770 and CIA)	$2000-$2005 $400C-$400E $4010-$4017
U108	CX20185/MC28719/LA8200	FDD R/W AMP
U109	UPA2003C	NEC

Schematics

 

Board Image

[1] image source Ray Carlsen’s Home Page