Search found 62 matches

by Pacman
Sun Oct 08, 2017 6:32 pm
Forum: TWEAKS & FIXES
Topic: SR98 PSU GETS MORE LOVE
Replies: 7
Views: 3188

Re: SR98 PSU GETS MORE LOVE

Your clear and right-to-the-point explanations in plain English are very informative and just what I need now that I'm about to recap just that PSU type for an STe. It's been working fine ever since I bought the computer (back in 89 or thereabouts I think) but I bought your SR98 recapping kit and du...
by Pacman
Sun Oct 01, 2017 7:23 pm
Forum: FLOPPY DRIVES KITS & UPGRADES
Topic: Choosing between three Sony MPF-920 drives
Replies: 35
Views: 10316

Re: Choosing between three Sony MPF-920 drives

Understood.
And that's the DMA chip it's attached to it, right?
And it doesn't matter what kind of ST it is (ST, STe, STfm etc.) for performing this modification?
by Pacman
Sun Oct 01, 2017 1:26 pm
Forum: FLOPPY DRIVES KITS & UPGRADES
Topic: Choosing between three Sony MPF-920 drives
Replies: 35
Views: 10316

Re: Choosing between three Sony MPF-920 drives

Yes, I know the feeling :lol: Zzzzzzzz..... A couple of questions regarding your modification: a) is that a 10K resistor array? b) which value is the orange ceramic capacitor? c) does the ceramic capacitor attach to the end of the blue capacitor on the PCB (C68) as I've illustrated with the red line...
by Pacman
Sun Oct 01, 2017 9:21 am
Forum: FLOPPY DRIVES KITS & UPGRADES
Topic: Choosing between three Sony MPF-920 drives
Replies: 35
Views: 10316

Re: Choosing between three Sony MPF-920 drives

You mean the Sony chip caused problems? Please explain in more detail what you mean by the pull up on the DMA data bus. A pullup resistor connected somewhere on the DMA chip in the STe? Do you think exchanging the PCBs inside the floppy drive would be OK? If I don't get the new drive to work (2001 m...
by Pacman
Sun Oct 01, 2017 12:07 am
Forum: FLOPPY DRIVES KITS & UPGRADES
Topic: Choosing between three Sony MPF-920 drives
Replies: 35
Views: 10316

Re: Choosing between three Sony MPF-920 drives

I've looked into it further and understood you need: a) an alignment floppy disk b) alignment software (I've been told the official Atari diagnostic cartridge can do this) c) a dual channel oscilloscope so my conclusion is that for just one drive it's just not worth it. Perhaps for servicing multipl...
by Pacman
Wed Sep 27, 2017 12:51 am
Forum: FLOPPY DRIVES KITS & UPGRADES
Topic: Choosing between three Sony MPF-920 drives
Replies: 35
Views: 10316

Re: Choosing between three Sony MPF-920 drives

Yes, that's true :D I suppose this means that your HD module doesn't need any more drive modification than just adding the HD select wire (and drive 0 change) because of added logic that the HD modules from other back in the 90s didn't have? How about for use with the Mega STe? It seems to work fine...
by Pacman
Mon Sep 25, 2017 10:06 pm
Forum: FLOPPY DRIVES KITS & UPGRADES
Topic: Choosing between three Sony MPF-920 drives
Replies: 35
Views: 10316

Re: Choosing between three Sony MPF-920 drives

I've received the drive and indeed, this Sony MPF-920 Z/121 (April 2009) has a BH9558KV chip (the square PLCC shaped one marked "IC1"). The other chip (a smaller rectangular shaped SMD chip marked "IC2") is a BD6861FS. So no Sony IC as with my previous drive. What I've done so far is change the driv...
by Pacman
Thu Sep 21, 2017 2:32 pm
Forum: HARDWARE ISSUES
Topic: Mega STe DIP switch #8 (DMA sound)?
Replies: 6
Views: 1765

Re: Mega STe DIP switch #8 (DMA sound)?

Correct.
by Pacman
Thu Sep 21, 2017 2:06 pm
Forum: HARDWARE ISSUES
Topic: Mega STe DIP switch #8 (DMA sound)?
Replies: 6
Views: 1765

Re: Mega STe DIP switch #8 (DMA sound)?

Sysinfo says that DMA sound is ON when DIP #8 is OFF and OFF when DIP#8 is ON. So my theory about hearing from somewhere that DIP #8 concerns audio but not not getting the facts right about the switch position seems to be the explanation. Thanks for the link. I found it earlier on as well, but altho...
by Pacman
Thu Sep 21, 2017 12:26 pm
Forum: HARDWARE ISSUES
Topic: Mega STe DIP switch #8 (DMA sound)?
Replies: 6
Views: 1765

Re: Mega STe DIP switch #8 (DMA sound)?

It's already up (on) and enables HD floppy formatting in TOS. If I turn it off then reboot I no longer get the "High density" TOS desktop formatting option. I've checked the electrical connection of switch #8 and it's fine. I figure I must have been told/read that switch #8 handles DMA sound, so I a...

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