Troed's H4 build

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exxos
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Re: Troed's H4 build

Post by exxos » Wed Jun 24, 2020 12:12 am

troed wrote:
Tue Jun 23, 2020 11:42 pm
With a CPLD on the bus it shouldn't be too hard to make it Mega ST compatible though? Then TOS would indeed support it.
Job for you then ;)

The RTC chips are totally different.. parallel <> serial for starters. Just easier to just let software do it.
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Re: Troed's H4 build

Post by troed » Wed Jun 24, 2020 12:47 am

exxos wrote:
Wed Jun 24, 2020 12:12 am
troed wrote:
Tue Jun 23, 2020 11:42 pm
With a CPLD on the bus it shouldn't be too hard to make it Mega ST compatible though? Then TOS would indeed support it.
Job for you then ;)

The RTC chips are totally different.. parallel <> serial for starters. Just easier to just let software do it.
Sure, if wanting to make it Mega ST compatible the easiest way to do it would be to use the Ricoh RP5C15 chips instead of Dallas. Then the existing PAL code used in the Mega ST just needs to be handled by a CPLD on the remake board.

Part of me likes not having to use any extra boot software. OTOH I'm sure we'll do that for other reasons anyway.

/Troed

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Re: Troed's H4 build

Post by Smonson » Wed Jun 24, 2020 1:57 am

exxos wrote:
Tue Jun 23, 2020 11:03 pm
I don't think you can set the time with CP.. you have to use the FMCII software to set it.
viewtopic.php?f=25&t=1683
Is this something a TOS mod could potentially solve? I'm gonna add that to my list of things to get around to one day ;)

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Re: Troed's H4 build

Post by troed » Wed Jun 24, 2020 10:03 am

After a bit of searching I found a complete package with 20V8 JED and schematics to build up a MegaST compatible RTC. I've ordered a few RP5C15 and might try to build one up on my H4. I know there's major development done in a different direction for the remake, this is just something I do for fun for myself.

/Troed
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Re: Troed's H4 build

Post by rubber_jonnie » Wed Jun 24, 2020 10:34 am

FYI if you go to my doc here:https://www.exxoshost.co.uk/atari/last/ ... lation.pdf there are links for all the software you should need at the end of the doc, including a preconfigured boot disk image.

The CP software definitely doesn't work though, it has to be the FGMC package.
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Re: Troed's H4 build

Post by troed » Wed Jun 24, 2020 6:45 pm

... and for extra credit:

3BCC7FD0-2CAE-48F3-9DFF-692A2E229A16.jpeg
3BCC7FD0-2CAE-48F3-9DFF-692A2E229A16.jpeg (305.33 KiB) Viewed 1119 times

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Re: Troed's H4 build

Post by exxos » Wed Jun 24, 2020 7:08 pm

troed wrote:
Wed Jun 24, 2020 6:45 pm
... and for extra credit:

:bravo:

I can't actually remember if anyone tried that or not, wonder if I did, I forget, :lol:
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Re: Troed's H4 build

Post by troed » Wed Jun 24, 2020 7:14 pm

exxos wrote:
Wed Jun 24, 2020 7:08 pm
I can't actually remember if anyone tried that or not, wonder if I did, I forget, :lol:
Just ran the diagnostic cartridge ;) Working fine.

/Troed

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Re: Troed's H4 build

Post by exxos » Wed Jun 24, 2020 7:20 pm

troed wrote:
Wed Jun 24, 2020 7:14 pm
Just ran the diagnostic cartridge ;) Working fine.
:thumbup:

ah I did viewtopic.php?f=78&t=2310&start=20#p34228 :lol:
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Re: Troed's H4 build

Post by PhilC » Wed Jun 24, 2020 7:27 pm

exxos wrote:
Wed Jun 24, 2020 7:20 pm
troed wrote:
Wed Jun 24, 2020 7:14 pm
Just ran the diagnostic cartridge ;) Working fine.
:thumbup:

ah I did viewtopic.php?f=78&t=2310&start=20#p34228 :lol:
all 3 of mine have as well. Seems odd soldering on galv plate with a soldering iron set at 300C.
If it ain't broke, test it to Destruction.

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