New AtoMMC board: V4

[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

Greetings
Kees

[cjm]

Thanks Kees,

That's it!

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

Regards,
Chris

[oss003]

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

[cjm]

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.

[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?

Greetings
Kees

[roland]

Snapper is already very hard at 2MHz

[cjm]

... are the games still playable at 4 Mhz?

Probably not - but Chuckie Egg at 4MHz !

[cjm]

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

https://youtu.be/m-xtkX5JEPw

[oss003]

surprise.jpg (7.09 KiB) Viewed 362 times

[oss003]

F14 Tomcat is a good candidate for 4MHz..

[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.