My A500 "project" pics, details, build log?

[AmmoJammo]

went and checked,
mine does default to PAL, if I select NTSC the GBS crashes.... auto adjust might fix it, but not going to try as I'll loose my settings :p

[djos]

Interesting, my rev6a came with an 8372a from Germany and jp4 is closed - I might install a switch too.

[djos]

That is weird, my GBS doesn't like pal at all?

I did discover tho that the NTSC output works with my Samsung LCD monitor via miggy-VGA adapter but PAL doesn't. I'm thinking of making a sync stripper for my GBS to see if that fixes my PAL issue.

[AmmoJammo]

...isn't 8372A the standard PAL A500 chip?

[djos]

...isn't 8372A the standard PAL A500 chip?

Yep, Standard on rev6a iirc

[AmmoJammo]

but haven't you changed it to a 8372AB?

[djos]

but haven't you changed it to a 8372AB?

I'm not using it ATM as the it needs 2mb chip ram to work and Tomthul is still working out the kinks in my 2mb chip ram trapdoor card.

[AmmoJammo]

oh...

then why is yours NTSC?!?

[AmmoJammo]

btw, the difference between my two "stock" benchmark tests, was one had the TomThul 8meg added, the other did not.

also, the KS1.3 resulted in slightly higher scores than the 3.1

running the test with KS3.1 resulted in it scoring about 3 points less than yours :p

[djos]

oh...

then why is yours NTSC?!?

I'm really not sure to be honest, kinda puzzling.

Hehe, sneaky

[AmmoJammo]

Booting a 1.3 floppy in 68000 mode with ks1.3 it crashed with a yellow screen? While booting. It seems the mmr is badly unstable in 68000 mode with the a590 scsi controller connected.

[djos]

That is weird, my GBS doesn't like pal at all?

I did discover tho that the NTSC output works with my Samsung LCD monitor via miggy-VGA adapter but PAL doesn't. I'm thinking of making a sync stripper for my GBS to see if that fixes my PAL issue.

Btw, I did some mucking about today, I used Miggy -> scart -> RGB-Component transcoder -> GBS-8220 and I was able to use PAL & NTSC modes with no issues. I suspect that the built-in sync separator in my Component transcoder may have helped?

So then I tried using H/V-Sync + RGB direct from my Miggy to the GBS but couldnt get this to work at all for some reason???

[AmmoJammo]

So then I tried using H/V-Sync + RGB direct from my Miggy to the GBS but couldnt get this to work at all for some reason???

I do believe one of the sync signals is reverse polarity, positive instead of negative, or negative instead of positive.

I forget which one, but that's why it doesn't work

[djos]

I do believe one of the sync signals is reverse polarity, positive instead of negative, or negative instead of positive.

I forget which one, but that's why it doesn't work

That explains a lot!

Im thinking of making a Miggy to Female VGA lead for the GBS just for fun and to see if it works.

[AmmoJammo]

I found a 36Mhz crystal in a box? *shrugs*
Then I found a 46Mhz crystal on a sound card? that didn't work :p

[djos]

oh...

then why is yours NTSC?!?

Found the cause and Fixed it, the previous owner of my mobo had joined jp4 together - I fixed it today and now my miggy defaults to PAL and the correct clock speed 7.09Mhz.

I also found that the below settings on my GBS work fairly well with both PAL and NTSC:

Tweaked for: 800x600 res:
HPOS 50
VPOS 14
HSIZE 50
VSIZE 56
CLAMP ST 97
CLAMP SD 00

EDIT: and just discovered that PAL works with the GBS defaults now my miggy is running @ the correct clock-cycles! :p