CornBitXL™ V2 (Programmable ROM)

$19.00 USD

ROM failure is a common problem in Commodore 64 and related machines. Named in tribute to the KERNAL it’s meant to replace, CornBitXL™ is a 100% compatible ROM replacement for 27128 (16KB) or 27256 (32KB) ROM chips (incl. KERNAL & FUNCTION ROMs for post-breadbin machines, including C128 and PLUS/4). Version 2 adds support for 27256 ROMs.

The first DIP switch selects either 27128 (16KB) or 27256 (32KB) mode. What’s more, the CornBitXL™ has 4 different “slots” activated by the other DIP switches. Use them to have an all-in-one replacement for multiple machines.

SKU: CORNBITXL Categories: ,


The CornBitXL™ is not intended as a facility to transmit copyrighted content. Please do not purchase CornBitXL™ if you intend to use it in a way incompatible with copyright law. Please inquire if you need a specific configuration. I will not program them with content that violates copyright.

If you have the BackBit Chip Tester, the CornBitXL is fully reprogrammable with four 16/32KB ROMs of your choice. This is made possible by the extra pins that hang over on either side. The extra pins only take up a few millimeters of space, so they should not get in the way of other components. The included socket will made them even more likely to fit perfectly in your particular configuration.

Default Configuration:
Slot #1: 317053-01 PLUS/4 FUNCTION LOW
Slot #2: 317054-01 PLUS/4 FUNCTION HIGH
Slot #3: 318005-05 PLUS/4 & C16 KERNAL
Slot #4: 318008-01 1551 KERNAL

To reprogram with the Chip Tester, append four 16KB or 32KB binary files into a 64KB or 128KB file, respectively. Then those 4 ROMs will be available with the 2nd and 3rd DIP switches. Make sure to do a binary append.

Additional information

Weight 2 oz


There are no reviews yet.

Be the first to review “CornBitXL™ V2 (Programmable ROM)”

Your email address will not be published. Required fields are marked *