exxos's Atari, Amiga & retro forum

PhilC wrote: 06 Jun 2019 22:12 This is starting to sound very much like the faulty DMA I had in one of the Megas. Is it worth a try with changing it for another BAD-DMA?

I will see if I can find one...

exxos wrote: 06 Jun 2019 22:23

PhilC wrote: 06 Jun 2019 22:12 This is starting to sound very much like the faulty DMA I had in one of the Megas. Is it worth a try with changing it for another BAD-DMA?

I will see if I can find one...

Nope, not the DMA chip.

Did a video... watch it all, and you will see what I mean...

If it's working fine in Ickys machine then the theory is fine, it's just duplicating it.

Again it reminds me of trying to use the Pak 030 in a machine that had 150ns ram, some times it booted perfectly but others it showed rom or ram faults. So since this is related to the floppy, is it worth swapping 68901, 1772 and the ym2149?

Its got a be a silly timing issue between chips.

I've swapped, CPU, GLUE, MMU, RAM, 1772, DMA, ROM so far.

I will have to put jumper links in all the clock lines so I can jumper in stock clocks and new clocks as I think Icky was planning.. I think there is some odd fault on my remake board... it had been working fine a few weeks ago, never had any issues at all.

Sounds like we just need a couple more test subjects to verify then.

Then it's out with the scope for you then exxos.

I put my STF away one month, for it never to work again, lol, so know the feeling.

PhilC wrote: 07 Jun 2019 06:33 Sounds like we just need a couple more test subjects to verify then.

Then it's out with the scope for you then exxos.

I put my STF away one month, for it never to work again, lol, so know the feeling.

Now you have got your PAK working may be its time to pull out the STF and get it back up and running :)

Would be good to see how the other STF's behave at 16MHz.

Yeah, call it laziness. It's missing a couple of video signals like Vsync thanks to a PCB manufacturing defect but hopefully I'll track the rest down.

Just trying to track who has the 16MHz mod installed and in what state it is

As far as we know reading various threads here are states of STF Remake 16MHz mods. Let me know if I have any info wrong or if you have added the 16MHz mod and we don't know about it.

• Icky's - Running stable with blitter
• Exxos' - Not so stable with blitter
• PhilC - Not so stable and won't run blitter
• kodak80 - Read on thread kodak80 was ordering some 16MHz mod pcbs not sure the status
• PaulJ - Looking to build shortly

Mine works fine with glitter. It can run all day. Mine is currently broken as I was investing the boot issue. Its pending me making the sync board for it.