New AtoMMC board: V4

emulators, hardware and classic software for atom + system machines
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oss003
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Re: New AtoMMC board: V4

Post by oss003 »

There are some wait loops in the code ...... maybe they are to fast for 2Mhz.
You can test it by changing the value at #2866 (was $04) like this:

*LOAD JOYTEST
?#2866=8
LINK#2800

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Kees
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cjm
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Re: New AtoMMC board: V4

Post by cjm »

Thanks Kees,

That's it!

I get 11111111 at 2MHz with that patch and setting ?#2866=16 works for 4MHz

Regards,
Chris
Atom + YARRB + Noise Killer + HDMI adapter + Homebrew RPi-MMC AtoMMC V4
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oss003
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Re: New AtoMMC board: V4

Post by oss003 »

cjm wrote:
Thu Dec 17, 2020 10:25 pm
Thanks Kees,

That's it!

I get 11111111 at 2MHz with that patch and setting ?#2866=16 works for 4MHz

Regards,
Chris
Nice ..... 16 should also work for 1 and 2 Mhz.

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Kees
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cjm
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Re: New AtoMMC board: V4

Post by cjm »

oss003 wrote:
Fri Dec 18, 2020 7:07 am
cjm wrote:
Thu Dec 17, 2020 10:25 pm
Thanks Kees,

That's it!

I get 11111111 at 2MHz with that patch and setting ?#2866=16 works for 4MHz

Regards,
Chris
Nice ..... 16 should also work for 1 and 2 Mhz.

Greetings
Kees
The problem is that I will need to patch Chuckie Egg to run it at 4MHz :(

A better solution would be a patch to the AtoMMC firmware - assuming that's possible.
Atom + YARRB + Noise Killer + HDMI adapter + Homebrew RPi-MMC AtoMMC V4
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oss003
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Re: New AtoMMC board: V4

Post by oss003 »

Don't know if that's possible and if that's wise because PORTB on the AtoMMC board is a general port which also can be used for other things. I know Charlie connected a mouse in the ZX Spectrum version which has the same PIC controller.

In fact you have to patch all joystick games but the question is .... are the games still playable at 4 Mhz?

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roland
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Re: New AtoMMC board: V4

Post by roland »

Snapper is already very hard at 2MHz :lol:
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Re: New AtoMMC board: V4

Post by cjm »

oss003 wrote:
Fri Dec 18, 2020 7:25 pm
... are the games still playable at 4 Mhz?
Probably not - but Chuckie Egg at 4MHz ! :lol:
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Re: New AtoMMC board: V4

Post by cjm »

I know it's pointless but here is Chuckie Egg with Kees's patch running at 4MHz

https://youtu.be/m-xtkX5JEPw
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Re: New AtoMMC board: V4

Post by oss003 »

surprise.jpg
surprise.jpg (7.09 KiB) Viewed 362 times
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Re: New AtoMMC board: V4

Post by oss003 »

F14 Tomcat is a good candidate for 4MHz..
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Re: New AtoMMC board: V4

Post by dreamerxb »

Can I order also a atommc board V4 from you ? I have just restored my old atom and this is the perfect way to run my software again.
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