Manuali

Forth per VIC20 e CBM64

Schemi elettrici

Schematics diagram

Schemi elettrici VIC-20 vers. E
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.

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.

251027l1.gif

 

251027l2.gif

 

251027l3.gif

 

251027r1.gif

 

251027r2.gif

 

251027r3.gif

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

324001_1.gif

324001_2.gif

324001_3.gif

Immagini delle rom:

• Kernel (8K)
• Character generator (4K)
• Basic (8K)

VIC-20 Documentation Archive

Circuit Board Photos by Jeff Salzman

Books & Manuals	VIC-20 Programmer's Reference Guide; Schematic Diagram VIC-20 Reference Card (18 pgs), Nanos Systems Corp. 1983 Programmer's Aid (VIC-1212) Cheat Sheet, Manual VICMON (VIC-1213) Machine Language Monitor Manual HESmon Machine Language Monitor Manual Super Expander (VIC-1211A) Manual Memory Expander Manual (3k,8k,16k) VIC Modem Manual Game Manuals COMPUTE!'s ML for Beginners COMPUTE!'s Second Book of ML Digital Deli by Steve Ditlea
Technical Reference	C= Semiconductor Group -Product List, Datasheets CBM BASIC Tokens Joystick Specifications Keyboard Information
	6502/10 Information (from C=64 PRG) 65xx Series Information Kernel Differences
	VIC-20 Specific VIA Information VIC-20 Specific VIA Register Usage 6522 VIA "bug"  (see:  CB2 sound) The Serial Bus
	"VIC" Chip Information Additional "VIC" Chip Information "VIC" Chip Register Usage "VIC" Chip Tables
	VIC-20 Memory Information Memory Map ROM Map Build a 32K  Expander