A modern, user programmable replacement for 2316, 2332, 2364 mask ROMs
Designed by TheRetroChannel in Australia
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Buy 3 get $2 off each, buy 5 get $3 off each These are designed as a drop-in replacement for original aging and power hungry ROMs. Unlike other designs and bulky 28 to 24 pin EPROM adaptors, these hi…
Read More…Buy 3 get $2 off each, buy 5 get $3 off each
These are designed as a drop-in replacement for original aging and power hungry ROMs. Unlike other designs and bulky 28 to 24 pin EPROM adaptors, these hide all the ugly stuff out of sight to provide the cleanest possible look. And as these use modern EEPROMs, they consume a fraction of the power and can be reprogrammed in seconds without requiring a UV eraser.
Programming is achieved using an adaptor board which routes the required signals from the NEAT 2364 to most modern programmers (TL-866, T48, T56 etc.) A small switch is mounted on the underside of the ROM to set it into either programming PRG mode, or normal operation NOR mode. Once set to programming mode, insert the NEAT 2364 into the adaptor taking note of the orientation and select AT28C64E (SOIC-28) in your programming software. Load in your binary file and hit program, there is no need to erase the ROM first as the programming software should automatically do this.
Once programmed, remove the NEAT 2364 from the adaptor - take great care here as the pins can be bent if you pull it out at an angle. Set the switch to NOR and install the NEAT 2364 in your target system.
The programming adaptor also doubles as a way to backup your original ROMs. This means you can not only program your own replacement ROMs using binary files found on the internet, you can also backup and replace your original ROMs in seconds.
To create a backup of an original ROM, you will need to install an extra socket on the programming adaptor to raise the height above the pogo pins. Insert the original ROM into the adaptor taking note of the orientation, select AT28C64E (SOIC-28) in your programming software and turn pin detect OFF. Hit read, and if your original ROM is working and compatible you should see the contents in the buffer area. Note 2K and 4K ROMs will usually appear in the upper half of the buffer (starting from address 1000).
From here you can either save a backup of the ROM (and upload it to the internet if nobody has done so already ;-)), compare it to a known good dump, or burn it straight to the NEAT 2364 (just don't forget to remove that extra socket).
The NEAT 2364 should be compatible with most systems that use a 24pin mask ROM but it is impossible for me to test compatibilty with every system out there. Please see the table below for a list of known compatible and incompatible systems. This will be updated as more systems are tested.
System | Location | Description | Compatible | ROM size | Notes |
---|---|---|---|---|---|
Acorn Atom | IC20 | OS/BASIC? | ?? | 8K? | Untested |
Acorn Atom | IC21 | Floating Point? | ?? | 4K? | Untested |
Acron Atom | IC24 | AXR1? | ?? | 4K? | Untested |
Apple //c | UD16 | Keyboard Map | YES | 2K | |
Atari 1050 | U10 | OS? | ?? | 4K? | Untested |
Atari 2600/5200/7800 | N/A | N/A | NO | N/A | These systems and their cartridges use an inverted CS |
Atari 65XE/130XE | U4 | BASIC | YES | 8K | Should also work with XL and other XE systems |
CoCo 1 | U3 | Color BASIC | YES | 8K | Location may vary depending on board rev. |
CoCo 1 | U28 | Extended Color BASIC | YES | 8K | Location may vary depending on board rev. |
CoCo 2 | IC12 | Color BASIC | YES | 8K | Location may vary depending on board rev. |
CoCo 2 | IC13 | Extended Color BASIC | YES | 8K | Location may vary depending on board rev. |
Commodore 1541 | UAB4/UB3 | Lo-ROM | YES | 8K | See here for preprogrammed ROMs |
Commodore 1541 | UAB5/UB4 | Hi-ROM | YES | 8K | See here for preprogrammed ROMs |
Commodore 64 | U3 | BASIC | YES | 8K | Longboards only. See here for preprogrammed ROMs |
Commodore 64 | U4 | Kernal | YES | 8K | Longboards only. See here for preprogrammed ROMs |
Commodore 64 | U5 | Character | YES | 4K | Long or shortboard. See here for preprogrammed ROMs |
Commodore SX-64 | UD3 | Kernal | YES | 8K | See here for preprogrammed ROMs |
Commodore PET | ?? | ?? | ?? | ?? | I stuck one in my pet but all I got were scratches |
Commodore VIC-20 | UE11 | BASIC | YES | 8K | See here for preprogrammed ROMs |
Commodore VIC-20 | UE12 | Kernal | YES | 8K | See here for preprogrammed ROMs |
Commodore VIC-20 | UD7 | Character | NO | 4K | Uses CS1 and CS2. See here for preprogrammed ROMs |
IBM 5150 | U29 | Cassette BASIC F600 | ?? | 8K | Untested |
IBM 5150 | U30 | Cassette BASIC F800 | ?? | 8K | Untested |
IBM 5150 | U31 | Cassette BASIC FA00 | ?? | 8K | Untested |
IBM 5150 | U32 | Cassette BASIC FC00 | ?? | 8K | Untested |
IBM 5150 | U33 | BIOS | ?? | 8K | Untested |
Sinclair ZX80 | IC2 | OS | YES* | 4K | *Too tall for case when in socket. Can also be used for 8K ROM upgrade |
Sinclair ZX81 | IC2 | OS | YES | 8K | |
TI/99-4A | ?? | ?? | ?? | ?? | Untested but unlikely due to the use of TI2532's? |
TRS-80 systems | ?? | ?? | ?? | ?? | Untested |
As these use a 64Kbit (8KB) EEPROM, care must be taken to ensure the ROM data is in the correct location when replacing a 2316 (2KB) or 2332 (4KB) ROM. When dealing with 2KB or 4KB ROMs, the data should be doubled or quadrupled to fill the entire 8KB. This can either be done in the programmer software, a hex editor like HxD, or if using a Windows machine you can use the Command Prompt and copy /b command. For example with a 4K ROM the syntax would be: copy /b "myrom.bin"+"myrom.bin" "myromdoubled.bin"
All boards are hand assembled and tested before shipping.
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