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The Commodore 64, its floppy drive 1541 and other vintage computers use old 2332 (4KB) and 2364 (8KB) DIP-24 roms. 
For example the commodore 64 roms: CHAR SET (901225-01), BASIC (901226-01), KERNAL (901227-03) or the 1541 roms: DOS (325302-01), KERNEL (901229-05) are based on 2332/2364 DIP24 roms.
Also other vintage computers use DIP24 2332/2364 roms like PET CBM series computers.

This Multirom, programmed with the images of the original roms replaces the old 2332 / 2364 roms.

The Multirom contains up to n.4 user-selectable original roms (4KB and/or 8KB) and can be configured on the user needs. 
The Multirom will be shipped already programmed. Please ask for the choosed configuration.

Typical configurations
Kernal Multirom: four kernal in one multirom as CBM, Speed Dos, EXOS, DolphinDos;
  • Have 4 Kernal in one multirom;
  • For testing several C64 kernals;
Test Multitom: C64 Kernal, C64 Basic, C64 Character;
  • Useful to discover fault roms as you can try all roms with one Multirom;
  • Useful as spare part. One Multirom can work as four original ROMS;
Custom configuration: please ask for custom configurations;

The Multirom advantages
- The Multirom replaces 2332 and 2364 rom;
- In one multirom you can have up to 4 user-selectable roms;
- Low dissipation;
- High reliable;


The multirom can store up to 2 images 
The selection is done without an external switch !!!
At the boot the multirom starts with the default kernal. If you want to start with the secondary kernal it's enough to hold the key RESTORE during the boot ... easy!

You can change the default kernal at the boot with the minijumper installed on the multirom.
So with the jumper you have:
Kernal A (default)
Kernal B (with RESTORE pushed)

with the jumper removed:
Kernal B (default)
Kernal A (with RESTORE pushed)

In order to operate it's necessary to solder two wires on two points of the moderboard.

The wire A goes to the RESTORE signal from the keyboard.
The wire B goes to the reset signal of the CPU (pin 40).
See the picture for the exact points to solder the wires.

Please if you are not confident with the solder iron please ask to a friend or avoid to order this multirom.

Let me know which rom images you want.
The multirom will be shipped already programmed and tested!

solder point wire A
The solder point for wire A

solder point wire B
The solder point for wire B

The multirom with PLA and swinsid installed !!!
The switchless multirom with the PLA and Swinsid installed in my C64 !!!

 The multirom can store up to 8 banks of (8KB or 4KB) - with the 27c512
 The selection is done with mini jumpers.
 Jumper 1, 2 and 3 to select the rom bank:
 Bank0 set 1,2,3
 Bank1 unset 1 set 2,3
 Bank2 set 1,3 unset 2
 Bank3 unset 1,2 set 3
 Bank4 set 1,2 unset 3
 Bank5 unset 1,3 set 2
 Bank6 set 1 unset 2,3
 Bank7 unset 1,2,3

 Jumper 4 to select 4KB or 8 KB bank
 8KB set 4
 4KB unset 4

Instead of jumpers it is possible to install switches in order to operate the image ROM selection remotely.

The multirom will be shipped already programmed and tested.

 The multirom can store up to 4 banks of (8KB or 4KB) - with the 27c256 installed.
 The selection is done with SOLDER PADS.