Commodore Plus 4 power connector to C64 version

The Plus 4 power connector a square version of the Commodore 64’s and is annoying. It’s much more convenient to use a Vic 20 or C64 PSU as they are compatible and more readily available.

Here’s how to make the necessary modification.

First buy a PCB mountable 7 pin DIN connector and cut the two pins shown. Ebay is a good place to buy.

De-solder and remove square power connector.

An extra hole needs to be drilled in the circuit board to accommodate the extra pin. Mark the board by putting pencil lead on the end of extra pin and pressing it into the board.

Once drilled make sure to remove some of the green solder mask.

Bottom view

Solder new socket in place.

Finished version

Vic 20 Replace BASIC and Kernal ROM’s with 27128 EPROM

Vic 20 Replace BASIC and Kernal ROM’s with 27128 EPROM

I had a Vic 20 with a faulty BASIC ROM and thought it would be nice to combine the BASIC 
and Kernal ROM’s into one. This gives you the ability to modify the standard ROM's.

The conversion is pretty simple. The only issues are the two chip select lines that need
 to be combined into one, and the Address 13 line to select the upper and lower 8k blocks
 of the EPROM. An AND gate will combine the chip selects and connecting A13 to the BASIC
 ROM chip select will ensure that the correct ROM is available when required.

Vic 20 Memory Map

 HEX  DEC                  USAGE                 8k    1k
 0000-03FF   0000-1023     System variables      BLK 0 RAM 0
 0400-0FFF   1024-4095     3K expansion RAM area B0 RAM 1,2,3
 1000-1DFF   4096-7679     User Basic area       B0 RAM 4-7
 1E00-1FFF   7680-8191     Screen memory         BLK 0 RAM 7
 2000-3FFF   8192-16383    8K expansion RAM/ROM  BLK 1
 4000-5FFF   16384-24575   8K expansion RAM/ROM  BLK 2
 6000-7FFF   24576-32767   8K expansion RAM/ROM  BLK 3
 8000-8FFF   32768-36863   4K Character ROM      BLK 4
 9000-93FF   36864-37887   I/O block 0           BLK 4
 9400-95FF   37888-38399   COL RAM,BLK 1 filled  BLK 4
 9600-97FF   38400-38911   Normal COLOR RAM      BLK 4
 9800-9BFF   38912-39935   I/O block 2           BLK 4
 9C00-9FFF   39936-40959   I/O block 3           BLK 4
 A000-BFFF   40960-49152   8K Expansion ROM      BLK 5
 C000-DFFF   49152-57343   8K BASIC ROM          BLK 6
 E000-FFFF   57344-65535   8K Kernal ROM         BLK 7
UD5 or UD11
 (901486-01)

vic ROM socket 27128

74LS08

Acronyms
 /OE Output Enable (set low to enable data output from chip)
 /CE Chip Enable (set low to enable data output from chip)
 /CS Chip Select (same as Chip Enable)
 /PGM Program Mode (set low to program EPROM)
 Vpp Voltage used to program EPROM (usually 12.5 or 21V)

BASIC ROM socket to 27128
 A0-A12
 D0-D7
 Vcc to Vcc
 GND to GND

27128
 Pin 1 (Vpp) to Vcc
 Pin 20 (/CE) to GND
 Pin 27 (/PGM) to Vcc

74LS08
 Pin 7 to GND
 PIN 14 to Vcc
 Pin 1 to pin 26 (A13) of 27128
 Pin 1 to pin 20 (/CE) of BASIC ROM socket (BLK 6) UD5 or UD11
 Pin 2 to pin 20 (/CE) of Kernal Rom Socket (BLK 7) UD6 or UE12
 Pin 3 to pin 22 (/OE) of 27128

The chip select lines could also be taken from the 74LS138 (UB1 or UC5) or various 
other points on the Vic 20 motherboard.

IMG_4481

IMG_4482

IMG_4486

Commodore 64 Game disks 38 to 42

I have a large collection of Commodore 64 software which has been in my loft since the 80’s. I assumed all the disks would be corrupt due to their age and temperature changes. Nevertheless I decided to buy a disk drive from eBay and try to back them up. To my surprise most the them still work.

I’ve decided to put their contents online to help preserve the Commodore 64.

Each disk has an menu program. Just type LOAD”MENU”,8 & RUN

Games disk 38 (Download here)
Gribblys Day Out
Super Pipeline 2
Crystal Castles
Blue Max 2001
Space Trap

Games disk 39 (Download here)
J.B Squash
Ciphoid 9
Roland Rat
Hunchback II

Games disk 40 (Download here)
Jack & Bean
Grogs Revenge
Castle Nightmare
Devil

Games disk 41 (Download here)
Dropzone
Ms Pacman
The Dambusters
Moon Cresta

Games disk 42 (Download here)
Ollies Follies
Bounty Bob
Handicap Golf
Whirlybird

Commodore 64 Game disks 31 to 37

I have a large collection of Commodore 64 software which has been in my loft since the 80’s. I assumed all the disks would be corrupt due to their age and temperature changes. Nevertheless I decided to buy a disk drive from eBay and try to back them up. To my surprise most the them still work.

I’ve decided to put their contents online to help preserve the Commodore 64.

Each disk has an index program. Just type LOAD”INDEX”,8 & RUN

Games disk 31 (Download here)
Rocket Roger
Ancipital
Ant Attack

Games disk 32 (Download here)
Trollie Wallie
Break Fever
Bandits

Games disk 33 (Download here)
Quango
Valhalla
Benji

Games disk 34 (Download here)
Gumball
Toys Bizarre
QX9 Chm

Games disk 35 (Download here)
Falcon Patrol II
Impossible Mission
Flyerfox
Chiller

Games disk 36 (Download here)
Combat Leader
Silicon Warrior
Zim Sala Bim
Spelunker

Games disk 37 (Download here)
Star Race
Gobang
Stealth
Up n Down
Chock a Block
Tornado Low Level

Commodore 64 Game Disks 21 to 30

I have a large collection of Commodore 64 software which has been in my loft since the 80’s. I assumed all the disks would be corrupt due to their age and temperature changes. Nevertheless I decided to buy a disk drive from eBay and try to back them up. To my surprise most the them still work.

I’ve decided to put their contents online to help preserve the Commodore 64.

Each disk has an index program. Just type LOAD”INDEX”,8 and RUN.

Games disk 21 (download here)
3D Glooper
Shamus Case II
Barrier System
Crossfire
Moondust
Spy’s Demise
Pacman
Where’s my Bones
Spider

Games disk 22 (download here)
Bozos Night Out
Potty Pigeon
Gorf
Encounter

Games disk 23 (download here)
Pooyan
Tales of the Arabian Knights
Decathlon
Spikes Peak
Zaxxon

Games disk 24 (download here)
Drelbs
Guzzler
Skier 64
Ricky’s Revenge
Zompy Stomp
Yahtcee
Aztec Challenge
Suicide Strike

Games disk 25 (download here)
Manor
Moto Cross
Wavy Navy
Killer Watt

Games disk 26 (download here)
Flak
Gyruss
Star Wars
Break Dance
Operation Wirlwind
Lunar Outpost

Games disk 27 (download here)
Necromancer
Mystic Mansion
Baseball
Boulder Dash
Neptunes
Triad

Games disk 28 (download here)
Centipede
Quest for Tires
Save New York
Kid Grid
Zeppelin
Archon
Mr Robot
Vultures

Games disk 29 (download here)
Monty Mole
Trashman
Caverns of Sillahc

Games disk 30 (download here)
Flip and Flop
Pharoahs
Wizard of War
Snokie
Pit Stop

Commodore 64 Game Disks 11 to 20

I have a large collection of Commodore 64 software which has been in my loft since the 80’s. I assumed all the disks would be corrupt due to their age and temperature changes. Nevertheless I decided to buy a disk drive from eBay and try to back them up. To my surprise most the them still work.

I’ve decided to put their contents online to help preserve the Commodore 64.

Each disk has an index program. Just type LOAD”INDEX”,8 and RUN.

Games disk 11 (download here)
Burnin’ Rubber
Forest
Snooker
Cosmic Capers
Astral Zone
Bumping Buggies

Games disk 12 (download here)
Hellgate
Wallie goes to Rhymeland
Hobbit
Feats
Sting 64
Orange Squash

Games disk 13 (download here)
Space Pilot
Le Mans
Miner 2049’er
Dino Eggs
Solo Flight
Robotron 2084

Games disk 14 (download here)
Flying Ace
Time Runner
Mr Cool
Hard Hat Mack
Blue Print
Kid Grid
Buck Rogers
Dig Dug
Candy Bandits

Games disk 15 (download here)
Rescue Squad
Bluemax
Congo Bongo
David’s Midnight
Star Trek
Starpost
Lazarian

Games disk 16 (download here)
Survivor
Pinball
Invaders
Neutral Zone
Juice
Cops & Robbers
Squish’em
Kickman

Games disk 17 (download here)
Seafox
Moon Shuttle
Space Sentinel
Rat Race
Wizard
Pole Position
Jumpman Junior
Guardian
Panic

Games disk 18 (download here)
Aquanaut
Night Mission
Zodiac
Loco

Games disk 19 (download here)
Son of Blagger
Maggot Mania
Star Fighter
Omega Race
Serpo Race
ET Puzzel
Mr Mephisto
Eagle Empire

Games disk 20 (download here)
Mr Wimpy
UGH
Sheep in Space
Caeser the cat
Jackpot
The Boss

Commodore 64 Game Disks 1 to 10

I have a large collection of Commodore 64 software which has been in my loft since the 80’s. I assumed all the disks would be corrupt due to their age and temperature changes. Nevertheless I decided to buy a disk drive from eBay and try to back them up. To my surprise most the them still work.

I’ve decided to put their contents online to help preserve the Commodore 64.

Each disk has an index program. Just type LOAD”INDEX”,8 and RUN.

Games disk 01  (download here)
Stix
Vortex Raid
Gridrunner
Spriteman
Attack of the Mutant Camels
Super Froot
Crazy Kong
Scramble 64
Super Skramble
Depthcharge
Panic 64
Motor Mania
Rox 64
Greenhouse

Games disk 02 (download here)
Labyrinth
Monopole
Cyclons
Sega Frogger
Gridder 64
Pakacuda
Shadowfax
Hungry Horace
Anhialator
Centropods
Matrix
Escape MCP

Games disk 03   (download here)
Purple Turtles
Siren City
Hover Bover
Lazerzone
Renaissance
Vixplode 64
Defender
Hustler
Snakepit
Siege 64

Games disk 04   (download here)
Frogger 64
Hexpert
Cuddly Cubert
Scramble
Moon Buggy
Kong
Grab a Crab

Games disk 05  (download here)
3d Time Trek
Heroes of Karn
Falcon Patrol
Star Ship
Grand Master
Robin Rescue

Games disk 07  (download here)
Choplifter
Armageddon
Revenge of the Mutant Camels
Manic Miner
Shuttle
Cave
Gridtrap 64

Games disk 08  (download here)
Burger Time
Wheelin’ Wallie
Get off my Garden
Galaxy

Games disk 09  (download here)
Pipeline
Hunchback
Jamin
Retro Ball
Arcadia 64

Games disk 10  (download here)
Gamgster
Geisterhaus
Scuba Dive
Soccer II
Donkey Kong
Defender
Sammy Lightfoot