Make this my favourite 2364 or 2332 ROM replacement adapter - assembled

Electronic parts and connectors >> EPROMs
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Purmerend, Netherlands
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I***e (5)
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I***e (5) €14.00 31/07/2023  18:54:50 1
g***e (2) €14.00 08/03/2023  12:02:10 1
D***R (3) €14.00 25/07/2022  08:07:54 1
w***e (3) €42.00 25/05/2021  16:36:39 3
C***r (19) €14.00 01/08/2020  19:52:13 1
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PositivePositive C***r (19) Great item! Thanks! 20/08/2020  18:13:05

Item Number : 36272

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2364 or 2332 ROM replacement adapter - assembled/ready to plug in

Many classic computers use 2364 or 2332 mask ROMs. No direct replacements are being manufactured to day and as a result the retro computer community has developed modern replacements. This adapter is a take on such an adapter and is based on the 28C64 / 28C256 EEPROM in PLCC form factor. The PLCC form factor allows the EEPROM to be socketed and therefore EEPROM is removable by the end user and can be easily reprogrammed by the end user with just about any EPROM programmer, including the very popular TL866. The PLCC form factor also allows through hole parts, while the adapter remains limited in size in both surface as height.

The item sold here is about a assembled version of the adapter sold with a Microchip AT28C64B EEPROM. Pins and the sockets have been installed. Round pins will be installed, so you can plug the adapter into both normal and precision IC sockets. The adapter comes with an instruction manual. It is shipped empty by default, but at your request it can be preprogrammed with a ROM image of your choice. You will have to supply the ROM image yourself.

2364 mask ROMs have been used in at least the following computers:

  • Commodore VIC-20 (KERNAL and BASIC ROM)
  • Commodore 64, long boards (KERNAL and BASIC ROM)
  • Commodore 128 (character ROM)
  • Commodore 1541 floppy drive (DOS low and high ROM)
  • Acorn Atom
  • Atari 800XL
  • Atari 1050 floppy drive
  • IBM PC 5150 (U28/U29/U30/U31/U32/U33)
  • Sinclair ZX81
  • Tandy TRS-80


2332 mask ROMs have been used at least in the following computers:

  • Commodore VIC-20 (character ROM)
  • Commodore 64 (character ROM)
  • Commodore PET
  • Commodore CBM 4000/800 line
  • Sinclair ZX80
  • Synertek SYM-1
  • Tandy TRS-80
  • Texas Instruments TI99/4A


2364 ROMs have been manufactured by various manufacturers. ICs may have the following labels: 2564, 2664N, 27HC641, 9464B, 9464C, AM9264, CY7C264, G2364, M2364, MCM68764, MK36000, MM52164, MPS2364, MSM2965, NCR2364, R09464C, R2364A, R2912, S68B364, SY2364, TMM2366P, TMS4764, UM2364, UPD2364. If an IC is labeled with one of these, you can use this adapter to create a replacement.


The adapter is ideal as a spare part for situations where your old computer has a broken ROM. It is also usefull if you want to run custom ROMs, for example if you want to install JiffyDOS in your Commodore 64. Because the EEPROM can be removed and reprogrammed by the end user, you can easily reflash your old computer when you like.

If used in combination with a 28C256 EEPROM (this item comes with an AT28C64B), you can use this adapter also as a ROM switcher. The adapter has soldering points available for connecting switches.

The adapter can be used as is as a replacement for 2364 mask ROMs. For 2332 ROMs, some reconfiguration might be required in order to correctly route the CS2 line (which is by default connected to A12 just like the 2364). The adapter can be used as is to replace the 2332 character ROM in the Commodore 64. The instruction manual explains how to properly configure the adapter for 2332 applications where reconfiguration is required.

You will receive:

  • 1 * pre-assembled adapter, equiped with AT28C64B EEPROM, ready to plug-in
  • 1 * Instruction manual

Do you rather prefer a parts kit that you can solder together yourself? Look here.
Do you rather prefer bare PCBs? Look here.

Picture gallery

  • 2364 or 2332 ROM replacement adapter - assembled
  • 2364 or 2332 ROM replacement adapter - assembled
  • 2364 or 2332 ROM replacement adapter - assembled
  • 2364 or 2332 ROM replacement adapter - assembled
  • 2364 or 2332 ROM replacement adapter - assembled

Questions and Answers

  • Question: Vic 20 character ROM

    Posted by n***a (6) - 18/07/2021  09:02:51

    Answer: Break the connection between CE and GND in spot A and also the connection between A12 and CS2 in spot B. In spot B, reconnect A12 to Vcc (it's right next to it). Also in spot B, connect CE to CS2.

  • Question: I have one of these but want to modify it to use as a 2332 ROM now. There is mention that some reconfiguration might be required. Can you please tell me what I need to do?

    Posted by n***a (6) - 18/07/2021  08:52:23

    Answer: Can you tell me in which computer you would like to use the ROM? The exact procedure depends on how the specific computer uses the CS1/CS2 lines, so I need to know to give you the correct advise.

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