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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.

The ROM can be programmed with XGECU programmers (TL-866, T48, T56) using the required NEAT 2364 adaptor. A starter kit is available which includes the adaptor and a single ROM. Extra NEAT 2364 ROMs are also available separately if you require more than one, or if you already have the adaptor. There is no need to purchase the starter kit again if you already have the adaptor - unless you need another adaptor of course.

A video showing how to use the ROM and adaptor is available here. Please read on if you prefer written instructions

Programming

1. Connect the TL-866/T48/T56 to your computer and open the Xgpro programmer software. download latest version here
2. Click on “Select IC”, search for AT28C64 and select “AT28C64” from the device list
3. Insert the programming adaptor into the programmer making sure pin 1 (as indicated by the dot) is aligned correctly and lower the lever
4. Set the switch on the underside of the NEAT 2364 ROM to "PRG"
5. Insert the NEAT 2364 ROM into the adaptor, making sure the notch ( U shape ) on the silkscreen is aligned correctly with the adaptor socket
6. LOAD your 8K binary file into the buffer and hit program (PROG). (please see notes below if your binary file is not 8K in size)
7. Once programming is complete, carefully remove the NEAT 2364 ROM by lifting straight up
8. Set the switch on the underside of the NEAT 2364 ROM to "NOR" and install it in your system.

If the ROM isn't working as expected remove the ROM and double check the switch is set to NOR, no pins are bent or damaged on the ROM and system socket, and it has been installed in the correct orientation. If it still isn't working and your system is listed as compatible in the table below, please attempt to program the ROM again.

Please get in touch if you find an error in the compatibility list or have results for a system that is not listed.

Backing up/verifying original ROMs

1. Connect the TL-866/T48/T56 to your computer and open the Xgpro programmer software. download latest version here
2. Click on “Select IC”, search for AT28C64 and select “AT28C64” from the device list
3. Turn OFF (unselect) "Pin Detect" under Options
4. Insert the programming adaptor into the programmer making sure pin 1 (as indicated by the dot) is aligned correctly and lower the lever
5. Install an extra 24pin socket (not included) onto the programming adaptor - this is required to raise the height above the pogo pins
6. Insert your original ROM making sure the notch or pin 1 indicator is aligned correctly with the adaptor

To verify your ROM against a known good dump "LOAD" the original binary file and then hit "VERIFY". Please see below if your binary file is not 8K in size.

OR

To backup your ROM Hit "READ" and then "SAVE" to create a backup of your ROM. You can then program this to the NEAT 2364 or upload it to somewhere like archive.org if it has not already been dumped ;-)

Note 2K and 4K ROMs will usually appear in the upper half of the buffer (starting from address 1000), please see notes below for how to deal with ROMs smaller than 8K.

Handling ROMs under 8K

As the NEAT 2364 uses 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 Xgpro programmer software, a hex editor like HxD (see video linked above), or you can use the Windows Command Prompt and copy /b command. For example with a 4K ROM the syntax would be: copy /b "myrom.bin"+"myrom.bin" "myromdoubled.bin"

Likewise when backing up an original 2K or 4K ROM, the ROM will be read back as if it were 8K. It is recommended to "trim" the ROM down to the correct size using HxD. Please see the video linked above for details on how to do this.

Compatibility

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, please get in touch if you have anything to add.

All ROMs are hand assembled and tested before shipping.