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Re: Setting Up a dual boot rom
Posted: 09 May 2020 21:07
by Glorfindeal
I'm using an app call Hex Fiend on the Mac. That option doesn't exist. I may have to find another hex editor.
Re: Setting Up a dual boot rom
Posted: 09 May 2020 21:11
by PhilC
Glorfindeal wrote: 09 May 2020 21:07
I'm using an app call Hex Fiend on the Mac. That option doesn't exist. I may have to find another hex editor.
Ah right ok, no idea about that app, although may download it and try it on my iMac if its any good.
Re: Setting Up a dual boot rom
Posted: 09 May 2020 23:27
by Glorfindeal
Good! Download it and figure out how to do a byteswap and let me know. :lol:
Re: Setting Up a dual boot rom
Posted: 09 May 2020 23:33
by Glorfindeal
Am I allowed to attach my rom file so you can take a look at it?
Re: Setting Up a dual boot rom
Posted: 10 May 2020 00:19
by exxos
Glorfindeal wrote: 09 May 2020 23:33
Am I allowed to attach my rom file so you can take a look at it?
You can upload files, but you may have to rename the extension to txt or something.
Re: Setting Up a dual boot rom
Posted: 10 May 2020 18:18
by rubber_jonnie
I really want to get my hands on some erasable 27C4096 PLCC chips, and even if they are only UV erasable and not electrically, it means you don't bugger up an entire chip to do a test.
At least that way I can verify any dual TOS images I make since this whole thing of making a dual TOS ROM is new to me too.
And since the non-erasable variants are not exactly cheap, I'll at least know I have a good image before committing.
Re: Setting Up a dual boot rom
Posted: 10 May 2020 18:27
by PhilC
@rubber_jonnie do a search for hn27c4096 on Ebay and you'll find some Hitachi ones. These are the types I use.
Re: Setting Up a dual boot rom
Posted: 10 May 2020 18:32
by rubber_jonnie
PhilC wrote: 10 May 2020 18:27
@rubber_jonnie do a search for hn27c4096 on Ebay and you'll find some Hitachi ones. These are the types I use.
Cool, thanks I'll give that a go.
Re: Setting Up a dual boot rom
Posted: 10 May 2020 18:33
by JezC
@rubber_jonnie There was an ebay seller recommended on this forum a while back...I've ordered 5 of them but have not yet tested them. :roll:
A bit cheaper than the OTP versions....
I've ordered them to test the images prior to risking them in the OTP version (and also for a couple of applications where the speed of teh UV EPROMs is fine).
https://www.exxosforum.co.uk/forum/viewt ... =10#p31876
Biggest problem will be the delay before you can test with them :(
Re: Setting Up a dual boot rom
Posted: 10 May 2020 18:43
by rubber_jonnie
JezC wrote: 10 May 2020 18:33
@rubber_jonnie There was an ebay seller recommended on this forum a while back...I've ordered 5 of them but have not yet tested them. :roll:
A bit cheaper than the OTP versions....
I've ordered them to test the images prior to risking them in the OTP version (and also for a couple of applications where the speed of teh UV EPROMs is fine).
https://www.exxosforum.co.uk/forum/viewt ... =10#p31876
Biggest problem will be the delay before you can test with them :(
Yeah, Australia unfortunately, so China for all intents and purposes! Will see what I can find.