On Tuesday, June 6th, 2023 at 2:38 PM, Robert Feldman via cctalk <cctalk@classiccmp.org> wrote:
> > > >Message: 7 > > > Date: Tue, 06 Jun 2023 02:41:56 +0000 > > From: John Floren j...@jfloren.net > > Subject: [cctalk] Re: Getting floppy images to/from real floppy disks. > > To: "General Discussion: On-Topic and Off-Topic Posts" > > > cctalk@classiccmp.org > > > > It's funny that luggable power packs come up here as I'm trying to revive > > my Otrona >Attache... The power supply does nothing on AC input, even after > > a recapping, so I >thought I'd investigate the "DC Power Option" described > > in the manual. Unfortunately I >can't find any record that Otrona ever > > actually sold a "DC Power Option", which >would plug into an unpopulated > > 6-pin Molex connector on the back of the device. >Interestingly, the header > > inside the power supply labeled "DC Option" is a 7-pin >header, so I'm not > > sure which pin was "optional" for the external connector! > > > > I'd just replace the power supply wholesale with a little ATX supply or > > something, but >the machine needs 5V, 12V, -12V, and 15V; the latter is > > used to power the CRT and >represents a real challenge! I've yet to find > > anything that outputs all 4 levels at a >reasonable price. > > > > john > > > I have an Otrona Attache 8:16 with the DC option, so it was sold. (I used > both the Osborne and the Otrona in Peru, so having a battery option was an > advantage.) However, my Attache has the disk drives that both spin up at the > same time, and the DC option does not supply enough power to properly spin > both drives, so the computer will reboot if you try to read or write anything > to disk while on DC! > > I’m traveling now, but will open up my Attache and take some pictures for you > in a couple of weeks. > > Bob Thanks, Bob, that would be very helpful! I think the biggest thing is figuring out how the pack was wired into the J4 header on the PSU... if you've got the manuals for the DC option, it might have schematics too. john
