Panasonic HHC ROM 'capules'

[Paul Berger (Canada)]

(01-04-2023 07:25 PM)Jeff_Birt Wrote:  

(01-04-2023 06:56 PM)Paul Berger (Canada) Wrote:  I am not aware of any replacement for this very odd ROM module, making duplicating these capsules difficult.

Thanks for the heads up on the EPROM used.

The TRS-80 Model 100 uses another variant of these goofy Molex sockets and some clever folks designed a 3D printed carrier and PCB layout with castellated PCB edges as contacts. This would be a good jumping off point to design a PCB and carrier. You can also get the 68674 for ~$1 on eBay as well.

http://tandy.wiki/Teeprom

I have a saved search on eBay so hopefully some of the capsules will show up.

I was referring to duplicating things like the compiler modules that do not use the 68674 8K EPROM, but rather use an oddball 16K ROM that replaces the chip select line with another address line to squeeze 16K into a 24 pin chip 14 Address, 8 data, and 2 power = 24 pins. All commercial 16K EPROMs and ROMs I know of are in 28 pin packages. I would agree may be possible to make a replacement using more modern components.