Table-based version

Directory /pub/cbm/schematics/computers/vic20/

The VIC-20 and the VIC-20CR

../

[Parent directory]

cartridges@

Commodore VIC-20 cartridges

drives@

Disk drives

firmware@

System firmware

251027l1.gif

251027l2.gif

251027l3.gif

251027r1.gif

251027r2.gif

251027r3.gif

VIC-20CR rev.D (NTSC, new design). Assy number 251027-01. The PAL model has a crystal frequency of 4433618 Hz, and there is an extra 56pF capacitor on the solder side of the board, soldered parallel to R5.

324001_1.gif

324001_2.gif

324001_3.gif

VC-20 rev.B (PAL, old design). Assy number 324001-03. Bad scanning quality.

vic20-left.tiff

vic20-middle.tiff

vic20-right.tiff

This diagram is scanned from the Commodore VIC-20 Programmer's Reference guide. It describes an early NTSC motherboard and most probably contains some errors, like the Commodore 64 schematic from the Commodore 64 PRG does.

vic20bus.gif

A block diagram of the VIC-20 bus signals.

vic20mod.gif

The VIC-20 RF modulator (PAL).

[FTP://NIC.FUNET.FI/pub/cbm/schematics/computers/vic20/ | SunSITE ftp | SunSITE http]