Table-based version

Directory /pub/cbm/schematics/computers/b/

The Commodore Model B service manual and schematic diagrams


../
[Parent directory]
drives@
Disk drives
firmware@
System firmware

314010-06-i.gif
Service manual, B model computer (Jan. 1985, PN-314010-06), title page
314010-06-ii.gif
Service manual, B model computer, table of contents
314010-06-p1.gif
Page 1: block diagram
314010-06-p2.gif
Page 2: B model parts list
314010-06-p3-left.gif
314010-06-p3-right.gif
Page 3: 8256048 board layout
314010-06-p4.gif
Page 4: 8256048 PCB parts
314010-06-p5.gif
Page 5: 8256048 PCB parts, continued
314010-06-p6-left.gif
314010-06-p6-right.gif
Page 6: keyboard matrix
4256004-01-left.gif
4256004-01-parts.gif
4256004-01-right.gif
Switching power supply
8256043-01of14-left.gif
8256043-01of14-right.gif
�P, address & data buffers, bus arbitration
8256043-02of14-left.gif
8256043-02of14-right.gif
master timing
8256043-03of14-left.gif
8256043-03of14-right.gif
DRAM address & refresh
8256043-04of14-left.gif
8256043-04of14-right.gif
DRAMs, segments 1-2
8256043-05of14-left.gif
8256043-05of14-right.gif
DRAMs, segments 3-4
8256043-06of14-left.gif
8256043-06of14-right.gif
ROM array, 1k�8 static RAM
8256043-07of14-left.gif
8256043-07of14-right.gif
system decode
8256043-08of14-left.gif
8256043-08of14-right.gif
CRTC, video shift register
8256043-09of14-left.gif
8256043-09of14-right.gif
video RAM, address mux, latch
8256043-10of14-left.gif
8256043-10of14-right.gif
keyboard port, RS232C
8256043-11of14-left.gif
8256043-11of14-right.gif
user I/O ports, IEEE
8256043-12of14-left.gif
8256043-12of14-right.gif
SID, dot clock oscillator, expansion connector
8256043-13of14.gif
video output, power indicator
8256043-14of14.gif
I.C. count, power consumption
8256059-01.gif
8256059-02.gif
8256059-03.gif
8256059-04.gif
8256059-05.gif
8256059-06.gif
8256059-07.gif
8256059-08.gif
8256059-09.gif
8256059-10.gif
8256059-11.gif
8256059-12.gif
These schematics seem to be quite identical with 8256043.
README
General information about the Commodore Model II computers.

[FTP://NIC.FUNET.FI/pub/cbm/schematics/computers/b/ | SunSITE ftp | SunSITE http]

[email protected]

Hosted by www.commodore.ca.

To return to the main site, click
Products, History, Gallery, Manuals, Downloads, Links, Arcade and Forum

 

(C) 2002 - 2008 Up & Running Technologies Incorporated
If you want to use any images or text from this site you must get written approval first.  Click HERE to send an email request explaining your intended usage.