Commodore 64 Chips

Custom chips and discrete logic as used in the C64.  The logic and memory chips will be new / unused, whilst custom chips (SID, VIC, CIA, 6510 etc) will have been harvested from boards and tested. There are many C64 fault finding pages and videos on the net, and I have put up some brief info myself here.

Products:

Click on the product thumbnail for an enlarged view.

2114 Colour RAM for Commodore 64 or equiv: LC3514A / TMM314

2114 Colour RAM (IC "U6" in breadbin, "U19" in C64C)

  • Unused, old stock (not soldered) chips in good condition.
  • Tested before dispatch.
  • Note: Depending on supplies, equivalent chip may be sent (TMM314, LC3514A etc)

Typical symptoms when faulty in C64:

  • Incorrect, random or flickering colour attributes on power up.
Price: £ 2.50   Add to cart. (5 in stock)
251913-01 BASIC/KERNAL ROM for C64C Desoldered

251913-01 BASIC/KERNAL ROM for C64C  *De-soldered*

  • 28 Pin combined BASIC/KERNAL ROM at U4 in the C64C
  • Desoldered, and re-tested: OK
Price: £ 3.99   Add to cart. (1 in stock)
4066 Logic IC

CMOS 4066 IC

Common symptoms when faulty: Colour problems such as random colour “chequerboard” pattern on screen or no colour.

Price: £ 0.75   Add to cart. (6 in stock)
41464 RAM Chip

41464 RAM Chip

  • Organization: 64K x 4
  • Speed 120ns
  • NEC brand
  • Package: 18 pin DIL
  • All tested before dispatch.

As used on late revision motherboards of Commodore 64, Spectrum 128 +2A/+2B/+3 

Will also replace 4464 type RAM ICs.

Price: £ 2.25   Add to cart. (12 in stock)
4164 Spectrum Upper RAM / C64 RAM etc chip

4164 RAM Chip - Texas Instruments Brand

  • Organization: 64K x 1, Speed: 150ns or faster. Package: 16 pin DIL
  • Unused, clean, old stock parts (condition as new - all chips tested before dispatch)
  • Texas Instruments brand.

This chip will replace:

  • Upper RAM chips in the ZX Spectrum 48K (Replaces TMS4532-15NL3, TMS4532-15NL4 , OKI M3732H-20 etc)*
  • Spectrum 128 RAM chip (RAM in 'toast rack' 128k and in early 128 +2s) 
  • Commodore 64 RAM chips (most 'breadbin' models use 8 RAM chips. Note: The 64C uses 2 x 41464)

*  These 4164 chips serve as a universal replacement for all the different types of UPPER RAM chips originally used in the Spectrum 48K - IE: You can use these to replace any number of bad chips at IC15-IC22 no matter what type of chips were originally installed (and the configuration links can be left alone). Please note: These chips cannot be (directly) used to replace the "4116" chips used for the LOWER 16KB of RAM in the bottom left of the Spectrum 48 PCB.

Faulty RAM chips in the C64 often result in an "Out of Memory" error on boot or less than 38911 bytes free. In the Spectrum, when the upper RAM is bad the system will often boot faster and work as a 16K machine. One crude but often effective way to test which chip is bad, is to "piggy-back" a working chip on each RAM chip one at a time. If the error goes away or at least changes, there's a good chance that chip is faulty.

Price: £ 1.30   Add to cart. (20 in stock)
6510 CPU for Commodore 64

6510 CPU Chip 

  • Tested and removed from a socket - chip has not been soldered.
  • When these chips fail, common symptoms can be: Blank screen, No border, Cartridge doesnt work, Certain programs lock up. 
Price: £ 14.99   Add to cart. (1 in stock)
6510 CPU for Commodore 64 - Desoldered

6510 CPU for Commodore 64  *Desoldered*

  • Desoldered chip with cleaned and straightened pins.
  • Supplied fitted into a high quality "turned-pin" socket  (acting as a piggyback carrier - these sockets have sturdy pins and can in pressed into a normal DIL socket or soldered to the PCB)
  • Tested in a working PCB.
  • If out of stock, check if I have the 8500 version (scroll down) as these will also work fine the breadbin.
Price: £ 9.99   Add to cart. (out of stock)
6526 CIA Chip for Commodore 64

6526 CIA chip for Commodore 64

Tested and removed from an IC socket - chip has not been soldered.

Some typical faults that can occur when these chips are bad in a C64 include:

  • Keyboard stops responding
  • No cursor / stops blinking
  • Joystick doesn't work correctly
  • "Device not present" error when accessing disk drive
  • Disk drive continues to search when trying to load
  • User port does not function
  • After a few minutes, characters all over screen
  • Certain programs freeze

If your board has socketed chips, a simple way to test the 6526 CIA chips is to swap over U1 and U2 (they're both the same IC). If the fault appears to go away or at least changes, you know one CIA is bad. If the keyboard and joystick work then you can be pretty certain the CIA in U1 is OK.

Price: £ 14.99   Add to cart. (out of stock)
6526 CIA Chip for Commodore 64 - Desoldered

6526 CIA chip *De-soldered and Re-mounted*

  • Chip has been carefully de-soldered from a bad C64 PCB, its pins cleaned and then pressed into a new high-quality "turned-pin" type chip carrier which can be soldered directly to a PCB or pressed into a normal PCB-mounted DIL socket.
  • Tested at U1 and U2 locations - working fine in both (serial, joystick and keyboard functions OK)
Price: £ 9.99   Add to cart. (out of stock)
6569 R3 VIC II PAL Video Chip for Commodore 64

6569 R3 VIC II PAL Video Chip 

  • Extracted from a socket - has not been soldered
  • Tested for 1 hour on various games - all modes OK
  • An R3 VIC-II can normally replace an R1 without problems, though like-with-like is usually preferred.
  • A heatsink is recommended to prolong life of VIC-II chip if your C64 is a type without any (see mods section)

Some typical faults that can occur when the VIC chip is bad include:

  • Blank screen
  • Graphical glitches (especially in bitmap mode with the R3 VIC)
  • Incorrect colour or none at all
Price: £ 16.99   Add to cart. (out of stock)
6581 SID Chip for Commodore 64 (Medium filter)

6581 SID Chip (Medium filter)

  • Removed from a socket - chip has not been soldered.
  • Tested by playing tunes from the "High Voltage SID Collection" for an hour, all played fine.
  • A heatsink is recommended to prolong life of SID chips (see mods section)
  • A note about the filter response on SID chips: Every SID chip is different - this was always the case due to limitations in NMOS chip manufacturing back in the day. The type of capacitors on the PCB can also have an effect. This may or may not be an issue for buyers (many programs avoided using the filter due to its unreliable nature) but to aid those looking for a specific type I categorize the SID Chips I sell into light, medium and heavy filter types. Note that these are approximate, subjective bands - in reality, SID filters have a spectrum of effect strengths.
Price: £ 29.99   Add to cart. (out of stock)
7406 Logic IC

7406 Logic IC

Common symptoms when faulty: Blank screen. Partial failure: Drive access problems: Drive resets but “device not present” error when accessed.

Price: £ 0.89   Add to cart. (8 in stock)
74LS08 Logic Chip

74LS08 Logic IC

Common symptoms when faulty: Normal startup border but screen full (or nearly) of garbage characters.

Price: £ 0.70   Add to cart. (10 in stock)
74LS139 Logic IC

74LS139 Logic IC

Common symptoms when faulty: Blank screen.

Price: £ 0.80   Add to cart. (16 in stock)
74LS14 Logic IC

74LS14 Logic IC

As used in the C64C, 1541 disk drive etc

Price: £ 0.89   Add to cart. (8 in stock)
74LS193 Chip

74LS193 IC

  • Located within the VIC-II shielded area on earlier C64 boards.
  • Unused old stock (not soldered) - Tested: OK 
Price: £ 0.99   Add to cart. (12 in stock)
74LS257A Logic Chip

74LS257A Logic IC

Common symptoms when faulty: Blank screen, less than 38911 bytes free at startup or “garbage” screen.

Price: £ 0.75   Add to cart. (4 in stock)
74LS258 Logic IC

74LS258 Logic IC

 Common symptoms when faulty: Blank screen.

Price: £ 0.75   Add to cart. (12 in stock)
74LS373 Logic Chip

74LS373

Common symptoms when faulty: Screen startup has normal border, but characters are scrambled.

Price: £ 0.99   Add to cart. (10 in stock)
74LS629 Chip

74LS629 IC

  • Located within the VIC-II shielded area on earlier C64 boards.
  • Unused, old stock IC (not soldered) - Tested: OK 
Price: £ 1.29   Add to cart. (12 in stock)
74LS74 Logic IC

74LS74 Logic IC (U29)

Common symptoms when faulty:

  • Entire screen blank with noise pattern
  • Startup screen shows normal characters in multicolored "rainbow"
Price: £ 0.79   Add to cart. (16 in stock)
8500 CPU for Commodore 64  ** Desoldered **

8500 CPU for Commodore 64  *Desoldered*

  • As used mainly in the C64C but work fine in 'Breadbin' C64's too.
  • Desoldered chip with cleaned and straightened pins.
  • Supplied fitted into a high quality "turned-pin" socket  (acting as a piggyback carrier - these sockets have sturdy pins and can in pressed into a normal DIL socket or soldered to the PCB)
  • Tested in a working PCB.
Price: £ 9.99   Add to cart. (out of stock)
8565 R2 VIC-II Chip for C64C (PAL)

8565 R2 PAL VIC-II Chip *For C64C Only*

  • Important: For C64C only (UK / European PAL version) - Not for breadbin C64.
  • Extracted from a socket, has not been soldered.
  • Tested: Working fine.
Price: £ 14.99   Add to cart. (1 in stock)
8580 SID Chip for C64C only

8580 SID Chip *For C64C Only*

  • Very Important: For C64C only -This version of the SID chip is not compatible with the breadbin C64
  • Extracted from a socket, has not been soldered.
  • Tested: working fine.
Price: £ 24.99   Add to cart. (out of stock)
901225 - 01 Character ROM for Commodore 64

901225 - 01 Character ROM for Commodore 64 (used)

Tested and removed from an IC socket - chip has not been soldered.

Typical faults that can occur with a C64 when these chips are bad include:

  • Scrambled graphics in place of characters
  • Unit completely dead
Price: £ 6.50   Add to cart. (out of stock)
901225 - 01 Character ROM for Commodore 64 - Desoldered

901225 - 01 Character ROM for Commodore 64 *Desoldered*

  • Has been desoldered and tested afterwards in a working boards - all bytes verfied OK.
  • Supplied pressed into a high quality "turned-pin style 24 pin socket" acting as a "piggyback" chip carrier. (This means that only new, perfectly straight pins go into the existing socket on the PCB  - it can of course be soldered in place if preferred).
Price: £ 4.50   Add to cart. (2 in stock)
901226 - 01 BASIC ROM for Commodore 64

901226 - 01 BASIC ROM for Commodore 64

Tested and removed from an IC socket - has not been soldered.

Typical faults that can occur with a C64 when these chips are bad include:

  • Constant Syntax Error
  • Blank screen on power up
  • When return is pressed, cursor returns to home position
  • Poke command doesnt work
Price: £ 6.50   Add to cart. (out of stock)
901226 - 01 BASIC ROM for Commodore 64 - Desoldered

901226 - 01 BASIC ROM for Commodore 64 * Desoldered *

  • Has been desoldered and tested afterwards in a working boards - all bytes verfied OK.
  • Supplied pressed into a high quality "turned-pin style 24 pin socket" acting as a "piggyback" chip carrier. (This means that only new, perfectly straight pins go into the existing socket on the PCB  - it can of course be soldered in place if preferred).
Price: £ 4.50   Add to cart. (1 in stock)
901227 - 02 Kernal ROM for Commodore 64

901227 - 02 Kernal ROM for Commodore 64

Tested and removed from an IC socket - has not been soldered.

Some typical faults that can occur with a C64 when these chips are bad include:

  • Cursor jumps back to home position
  • Restore key doesnt work
  • Keyboard doesnt operate when system warms up
  • Blank screen on power up
  • Game cartridge doesnt function
Price: £ 6.50   Add to cart. (out of stock)
901227 - 02 Kernal ROM for Commodore 64 - Desoldered

901227 - 02 Kernal ROM for Commodore 64 *Desoldered*

  • Chip has been desoldered from and then tested in a working PCB - all bytes verified OK
  • Supplied pressed into a high quality "turned-pin style 24 pin socket" acting as a "piggyback" chip carrier. (This means that only new, perfectly straight pins go into the existing socket on the PCB  - it can of course be soldered in place if preferred).
Price: £ 4.50   Add to cart. (out of stock)
901227 - 03 Kernal ROM for Commodore 64

901227 - 03 Kernal ROM for Commodore 64 (used)

Tested and removed from an IC socket - chip has not been soldered. The 901227-03 KERNAL ROM can be used were an -03 or -02 were fitted (it fixes a couple of bugs that were in the previous version) 

Some typical faults that can occur with a C64 when these chips are bad include:

  • Cursor jumps back to home position
  • Restore key doesnt work
  • Keyboard doesnt operate when system warms up
  • Blank screen on power up
  • Game cartridge doesnt function
Price: £ 6.99   Add to cart. (out of stock)
901227 - 03 Kernal ROM for Commodore 64  - Desoldered

901227 - 03 Kernal ROM for Commodore 64  *Desoldered*

  • Has been desoldered and tested afterwards in a working boards - all bytes verfied OK.
  • Supplied pressed into a high quality "turned-pin style 24 pin socket" acting as a "piggyback" chip carrier. (This means that only new, perfectly straight pins go into the existing socket on the PCB  - it can of course be soldered in place if preferred).
Price: £ 4.99   Add to cart. (out of stock)
MC4044P Phase/Frequency Detector

MC4044P Phase/Frequency Detector

  • Located within the VIC-II shielded area on earlier C64 boards.
  • Common symptoms when faulty: Blank screen.
  • Salvaged part (not soldered) - Tested: OK 
Price: £ 1.99   Add to cart. (6 in stock)
MOS 8701 chip

MOS 8701 Chip from UK PAL C64C

  • As found in later model breadbin C64s and the C64C near the VIC-II chip for system timing.
  • Used (removed from a socket - has not been soldered.)
  • Tested: Working.
Price: £ 3.99   Add to cart. (2 in stock)
NE556N IC

NE556N Timer IC

Common symptoms when faulty: Blank screen, computer will not reset or RESTORE key doesn’t work.

Price: £ 0.50   Add to cart. (15 in stock)
PLAnkton PLA replacement module for breadbin C64

PLAnkton replacement PLA module for breadbin C64

  • Made by Eslaplion, the PLAnkton is a popular substitute for the C64 PLA part no. 906114-01 or 251064-01
  • 100% compatible (actually tested) with ALL PAL & NTSC C64 mainboards 326298, KU-14194, 250407, 250425, SX-64, 250466 (NOT compatible with board 250469 - this board doesn't use a 28 pin PLA)
  • Runs cool and draws a fraction of the current of the original chip.
  • 1500+ units sold, and not a single defect or compatibility issue has been found.
  • 100% compatible with the C64 Reloaded V1 board (the V2 doesn't have a PLA)

STOCK UPDATE 13-12-2018: More planktons soon.. 

Price: £ 14.99   Add to cart. (out of stock)