Commodore computers

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Commodore made some rather excellent 8-bit computers, of which Rubenerd is rather enamoured. This page is for progress building, tinkering, upgrading, repairing, and maybe even playing on his fleet of vintage second-hand Commodore hardware.

Commodore VC-20 CR (1983)

PAL, cost-reduced (CR) version. Bought off eBay in 2023 from the UK. Was fully functional, save for a broken keyboard which I sourced a replacement for.

Have yet to decide what to name it.

Status

  • Fully functional

Upgrades

  • Retr0brighted white case
  • Original keyboard was broken, replaced with a beige double-shot Aldi C64 keyboard with the same font. Love how it looks!
  • Penultimate+ Cart

Wishlist

IC manifest

Chip Socket Model Date Top Underside Socketed? Heatsink? Notes
CIA UAB1 MOS 6522 1986 [sic] After-market? – Definitely a replacement
CIA UAB3 MOS 6522 4682 After-market? –
VIC UB7 MOS 6561-101 1883 After-market? Should
CPU UE10 MOS 6502 B 0683 After-market? Should
BASIC ROM UE11 MOS 901486-01 3883 – –
PAL KERNAL ROM UE12 MOS 901486-07 5281 Yes –

Commodore 16 (1984)

NTSC version. Bought off eBay for my 18th birthday from a chap in the US. Has come in super handy for troubleshooting my Plus/4, with which it shares a bunch of ICs.

Named Jan for everyone's favourite German Commodore expert Jan Beta. Among other help, his Commodore 16 repairathon was what got me to fix my Plus/4.

Status

  • Mostly functional, but doesn't turn on for the first few minutes
  • Reset switch doesn't work at all
  • RAM and other chips fully functional according to DIAG264

Upgrades

  • Added SaRuMan64 socket under TED, to increase memory from 16 to 64 KiB.

Wishlist

  • Dust cover
  • SD2IEC with appropriate alternative power connector
  • Replacement crystal and rework to convert to PAL machine

IC manifest

Chip Socket Model Date Top Underside Socketed? Heatsink? Notes
TED U1 MOS 8360R2 4084 AH363106 3 Yes Should Swapped from Plus/4 to verify
CPU U2 MOS 8501R1 Yes Should Swapped from Plus/4
BASIC ROM U3 MOS 318006-01 3084 Taiwan 26011B-575 Yes
KERNAL ROM U4 MOS 318005-04 3184 Taiwan 26011D-719 Yes NTSC
PLA U16 MOS 251641-02 2984 GH274106 Yes Should

Commodore Plus/4 (1984)

NTSC version. Bought off eBay for my 18th birthday from a chap in the US. Probably my favourite 8-bit computer design of all time.

Named David or my high school computer teacher Mr Dunham, who regaled me with stories of his 8-bit computer adventures over our 10-pin bowling practice.

Status

  • Fully functional

Upgrades

  • Replaced dead PLA with PLAnkton, after confirming issue by swapping PLA from C16
  • Replaced Commodore resin power brick with C64 adaptor, to also use that new power supply

Wishlist

  • SD2IEC with appropriate alternative power connector
  • Replacement crystal and rework to convert to PAL machine

IC Manifest

Chip Socket Model Date Top Underside Notes
TED U1 MOS 8360R2 2684 AH395110 3 Swapped from C16
CPU U2 MOS 8501R1 3680 Swapped from C16
PLA U19 PLAnkton (2023) Modern replacement
BASIC ROM U23 MOS 318006-01 2884 Taiwan 26011B-575
KERNAL ROM U24 MOS 318005-05 3884 Taiwan 26011D-129 NTSC
Function Low ROM U25 MOS 317053-01 3084 Taiwan 26011C-697
Function Hi ROM U26 MOS 317054-01 3284 Taiwan 26011D-718
SPI ROM U27 MOS 6525B 2484 For keyboard

Removed ICs

Computer Socket Model Date Top Underside Status
Plus/4 U19 MOS 251641-02 1984 2584 Taiwan GH195123 Dead, PLAnkton replaced

Commodore 128 (1985)

PAL version. Easily the most versatile and capable 8-bit machine of all time!

Named Screenbeard, who gave it to me after listing to a podcast episode where I wished for one! He's good civ.

Wishlist

IC manifest

Chip Socket Model Date Top Underside Notes
CIA U1 MOS 6526 4285
CIA U4 MOS 6526 4285 "S" (Socket is backwards)
SID U5 MOS 6581 R3 4285
CPU/MPU U6 MOS 8502 R0 4085
MMU U7 MOS 8722 R2 4385 Memory management unit
Z80 U10 Zilog Z80 B 3585 Z8400BPS
PLA U17
Character ROM U18 MOS 390059-01 (1985) CBM M452995 8541H
Colour SRAM U19 Hitachi HM6116P-4 2785 I think?
VIC-II U21 MOS 8566 4185 PAL version
VDC U22 MOS 8563 R2 0786 80 column, replaced
Clock generator U28 MOS 8701 4185 F6 "S" Next to VIC-II
BASIC/KERNAL ROM U32 MOS 251913-01 4185 Taiwan 26011D-370 Same as 64C
BASIC LO ROM U33 MOS 318018-02 4185 Taiwan 26011D-290
BASIC HI ROM U34 MOS 318019-02 4185 Taiwan 26011D-291
128 KERNAL ROM U35 MOS 318020-03 4085 Taiwan 26011D-292
U36 – –  – –           Unpopulated

Commodore 64C (1988)

PAL version. Bought off eBay in 2022. I know it's not as retro as a breadbin, but I've always loved the wedge-shaped design of the 64C.

Named Adrian for Adrian Black of Adrian's Digital Basement, who's enthusiasm and technical knowledge were instrumental in my fixing of several 8-bit machines.

Wishlist

IC manifest

  • PCB Assembly Number 250469
  • PCB Number 252311 Rev.4
Chip Location Model Date Top Underside Socketed? Heatsink? Notes
CIA U1 MOS 6526A 3588 216A –
CIA U2 MOS 6526A 3588 216A –
KERNAL and BASIC ROM U4 MOS 251913-01 3188 01 –
Character ROM U5 MOS 901225-01 3488 01 –
CPU U6 MOS 8500 3588 24 – Should
VIC-II U7 MOS 8565R2 3388 22 Yes Should
Super PLA U8 Sharp 2517715-011 3388 LH5062B A –
SID U9 MOS 8580R5 3688 25 Yes
Clock generator U20 MOS 8701 3588 F6 22 Yes

Disk drives

1541 disk drive

  • Spins and can read first track, but stepper motor doesn't engage
  • UPA2003C DIP-16 IC
  • W65C22N, replacement for MOS 6522 that runs cooler.

1571 disk drive

Dream devices

Stores

Australia

Overseas

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