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by exxos
Tue Sep 18, 2018 5:33 pm
Forum: ALPHA USER BUILDS
Topic: Icky - Progress
Replies: 3
Views: 39

Re: Icky - Progress

Icky wrote:
Tue Sep 18, 2018 5:22 pm
BERR on CPU goes high 5v at start and stays there
What about BG, BGACK, BR ? All those should stay high all the time...
by exxos
Tue Sep 18, 2018 5:30 pm
Forum: ALPHA USER BUILDS
Topic: Forgottenmyname - Progress
Replies: 13
Views: 74

Re: Forgottenmyname - Progress

I might make a new cable with hsync and hsync. Would everything else be the same minus the comp sync obviously You should get near 5V from the GLUE on the sync then.. composite voltage might be a fraction to low.. I've seen it a lot before with sync faults on ST's... https://www.youtube.com/watch?f...
by exxos
Tue Sep 18, 2018 4:47 pm
Forum: ALPHA USER BUILDS
Topic: Forgottenmyname - Progress
Replies: 13
Views: 74

Re: Forgottenmyname - Progress

I did a quick simulation based on the 3904 & 337..

Basically the Atari 3904 outputs a tiny higher voltage, but not by much.. but could be enough to cause issues...

2.335V vs 2.397V.

I guess you could swap the BC337 out for the 2N3904 from a the donor ST board.. see if that helps...

s1.jpg
s1.jpg (77.52 KiB) Viewed 21 times
by exxos
Tue Sep 18, 2018 4:36 pm
Forum: ALPHA USER BUILDS
Topic: Forgottenmyname - Progress
Replies: 13
Views: 74

Re: Forgottenmyname - Progress

Probably the thing to do is check composite sync on a working ST and then the STF... it could just be the voltage is a fraction lower than the TV likes or something silly...
by exxos
Tue Sep 18, 2018 4:19 pm
Forum: ALPHA USER BUILDS
Topic: Forgottenmyname - Progress
Replies: 13
Views: 74

Re: Forgottenmyname - Progress

BTW does your cable use the separate syncs or the composite sync ?
by exxos
Tue Sep 18, 2018 4:17 pm
Forum: ALPHA USER BUILDS
Topic: Forgottenmyname - Progress
Replies: 13
Views: 74

Re: Forgottenmyname - Progress

Forgottenmyname wrote:
Tue Sep 18, 2018 4:15 pm
MFP has 4Mhz on pin 35, 2.45753 on 17 & 18

will check the scart lead before i post a video. wheres the best place to upload vids?
I guess YouTube is best place, failing that if you can compress the video to a few MB then can be uploaded here..
by exxos
Tue Sep 18, 2018 4:04 pm
Forum: ALPHA USER BUILDS
Topic: Forgottenmyname - Progress
Replies: 13
Views: 74

Re: Forgottenmyname - Progress

Have you checked the clocks on the MFP ?

Also may help if you can post a capture of V&H sync..
by exxos
Tue Sep 18, 2018 3:21 pm
Forum: ALPHA USER BUILDS
Topic: Icky - Progress
Replies: 3
Views: 39

Re: Icky - Progress

I would first double check continuity on the ROM socket first of all.. socket problems are pretty common :(

Sounds like your getting some TOS init at least, it must be setting the palette to get a full white screen.. but never seen it go black after that..

Also please check BERR on the CPU...
by exxos
Tue Sep 18, 2018 3:15 pm
Forum: STF REMAKE PROJECT
Topic: TOS startup sequence.
Replies: 7
Views: 119

Re: TOS startup sequence.

Thanks.. it is confusing the address, could you add in what the proper address is plus what chip it is actually accessing ?
by exxos
Tue Sep 18, 2018 3:01 pm
Forum: SOFTWARE
Topic: DiagROM for ST
Replies: 47
Views: 377

Re: DiagROM for ST

Forgottenmyname wrote:
Tue Sep 18, 2018 2:58 pm
Hi TF, just a quick question, as is, will this boot from a cartridge on the STF? or will it need to be in the ROM socket?

I can burn some DIP proms which will fit the carts.

See his repo...

https://github.com/terriblefire/diagrom ... master/bin