One ROM - The Most Flexible ROM Replacement for Retro Systems
One ROM - The Most Flexible ROM Replacement for Retro Systems - Image 2

One ROM – The Most Flexible ROM Replacement for Retro Systems

£10.00

Update: 14 Nov 25 – a small number of One ROM Ice USB are currently available.  More stock is expected by end November.

One ROM is the most flexible ROM replacement for your retro systems.

There are two One ROM models:

  • ❄️Ice❄️ – based on an STM32F411RET6
  • 🔥Fire🔥 – based on an RP2350A

These come in USB and Pro (SWD) versions.

Replacing ROMs in a retro system requires some skill, and it is possible to damage your system or your One ROM if done incorrectly.  Only purchase a One ROM if you are comfortable you are capable of replacing your ROMs safely.

The ROMs are shipped with the pins to connect into the ROM socket soldered, but the jumper pins (the ones sticking out of the top) are not installed.  Pins are supplied for you to install if you wish – you may choose not to if your system has limited clearance above the ROM.  Alternatively, include a note with your order that you would like the header pins installed and we will pre-solder them for you.

Shipping:

  • UK: Shipping via 1st class post included in the price.
  • US: I recommend ordering on this website rather my ebay listing.  I deal with the custom fees on your behalf with the shipper, so you shouldn’t have to pay anything else to receive your package.
  • Europe (+Norway/Switzerland): I recommend ordering using the ebay listing.  While prices are slightly higher on ebay (to cover ebay’s fees), ebay will normally collect local sales tax at point of sale, meaning you should not be charged import duties and additional fees when your One ROMs are delivered.

For more details, see the detailed description below, and https://onerom.org.

SKU: N/A Category:

Description

I developed One ROM to be the most flexible ROM replacement for my retro systems, and want to share them with other retro enthusiasts.  I sell these at close to cost price, with a slight premium to cover selling fees, returns, etc.

You are welcome (in fact encouraged!) to have your own One ROMs manufactured – all of the hardware files are open source, and available on the github project page.  You can even modify the designs and sell them for profit if you wish.

Features:

  • Supports PETs, VIC-20s, C64s, 1541s, IEEE drives, TI-99, Coco2, etc.
  • Same footprint as original ROMs – doesn’t overhang the socket like other solutions.
  • Quick programming- just connect 3 wires and `make run`. Takes 5-10s to build and flash.  No programming jigs necessary.
  • USB Version: No programmer required, just connect using a micro-USB cable (not supplied) to a PC/Mac/Linux/Android device and flash with Chrome or One ROM Studio.
  • Pro Version: Use a $5 programmer (e.g. Raspberry Pi Pico) – no expensive EEPROM programmer required.
  • Reflash in situ – no need to remove the ROM from the host when reprogramming.
  • Software configurable chip select behaviour – no hardware jumpers required.
  • Stores up to 16 ROM images of different sizes and chip select configurations. Image selectable via jumpers.
  • Replace multiple ROMs with one ROM – a single One ROM can replace up to 3 original ROMs at the same time e.g. all of C64 kernel, BASIC, character set.
  • Dynamic bank switching – switch between ROM images on the fly, e.g. different char ROMs.
  • Hackable at runtime – change the ROM images being served and access telemetry from the ROM at runtime using Airfrog or other SWD probes.
  • Images combined automatically – no need to manually build up your own larger PROM image containing multiple retro ROMs.
  • Open source software and hardware – make and flash your own One ROMs and modify the firmware.

I use both Ice and Fire versions in my retro systems.

I am currently shipping hardware revisions:

  • Ice USB revision H

All One ROMs are shipped with a set of C64 KERNAL, BASIC, character and dead test ROMs installed, but can be reprogrammed to serve any 2364/2332/2316 ROM image, including the original ROM’s specific mask programmed chip select behaviour.  Visit https://onerom.org for programming tools.

These One ROMs have the pins to insert into the retro system’s ROM socket pre-soldered.  The image select jumper pins are not soldered – extra pins are supplied with each One ROM for you to solder yourself if you’d like these.  This keeps shipping prices lower and you only install the pins you need.

All One ROMs are shipped inside a robust 3d printed case to avoid damage to One ROM and the pins during shipping.

Additional information

Variant

Ice USB, Ice Pro, Fire USB, Fire Pro

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