How to wire up Auto boot ROM for FreHD Gate Array

[Chromedome45]

As the title says I need to know how to wire up the auto boot ROM for the FreHD on a Model 4 Gate array.

 

[Trash-Eighty]

If you like you can use an adapter:
https://www.nf6x.net/2013/11/version-2-of-trs-80-model-4-rom-adapter/

 

[Chromedome45]

Yeah I remember that little board. Thanks

 

[mudmin]

How do you do it without the little board? Ian's site just says something about soldering to "various" places.

 

[ngtwolf]

If I recall the TRS-80 is essentially a 2364 rom that you need to convert to a 2764, so it would be whatever that pinout is (google 2364 to 2764)

That said, it's such a confined space that personally I'd just go to pcbway or jlcpcb and you can get 5 of these boards made up for under $10 and save yourself the hassle. This board does add a feature to do a switch between the old and new kernel, but in my experience you'll never use that.

 

[mudmin]

I think you're right. I may do that. I appreciate it!

 

[Patrick.B (TTR)]

document how to wire it is found here. https://docs.google.com/document/d/...ouid=107941120412152075123&rtpof=true&sd=true

 

[abradford]

Hi, I know this is an old thread, but it the link to the wiring diagram has been deleted. Does anyone have an updated one? Thx

 

[Patrick.B (TTR)]

Hi, I know this is an old thread, but it the link to the wiring diagram has been deleted. Does anyone have an updated one? Thx

here you go: 4GA / FREHD https://drive.google.com/file/d/1WKU3CqqLZAV-ak4_zUZF8T7niTHvV5jO/view?usp=drive_link

 

[abradford]

here you go: 4GA / FREHD https://drive.google.com/file/d/1WKU3CqqLZAV-ak4_zUZF8T7niTHvV5jO/view?usp=drive_link

Thank you!