Apple IIgs question..

From: David Holland <dholland_at_woh.rr.com>
Date: Wed Jun 4 20:49:00 2003

I now consider myself an idiot. (again)

My 9 pin serial cable was not plugged in good..

It was plugged in just enough that I could transmit from the PC, but
not enough to received.

So, that's what those little thumbscrews are for..

<doh!>

We now return to our regularly scheduled programming.

David

On Wed, 4 Jun 2003, David Holland wrote:

> Hi,
>
> Wandered downstairs, and dug out my pile of parts.
> (and more importantly a spare ROM 01 system.) My testing was on a ROM 03.
>
> Thanks for the parts offers, I think I've enough parts now though..
> (The wife eye's me evilly every time I drag out my parts pile anyways :-) )
>
> I checked the voltages.
>
> The worst I saw as -10.2v (on what aledged to be the -12v pin) on the ROM03.
>
> The ROM 01's voltages were all pretty normal.
>
> There's nothing else plugged into the systems for the last couple of tests
> I just ran. This scope I have is fairly old, and probably not terribly
> accurate, but about the best I've seen is +/- 4.9v.
>
> Neither the ROM 01, nor the ROM 03 will talk to the PC.
>
> At this point, I'm wondering if the IIgs's normal "serial" is on the
> low side of valid, and my PC's (mis)wired for the high side. I'll
> try the serial ports on my Linux firewall.
>
> Data sheet for the AM26LS30's on the thing doesn't make sense to me either
> at this point.. but that's besides the point..
>
> Anybody got a schematic for the whole GS? :-)
>
> David
>
> On Wed, 4 Jun 2003, Ian Primus wrote:
>
> > Sounds like a weak PSU, I have had no trouble using ADT on a IIgs. How
> > much stuff do you have connected to it? I know I have found that after
> > two Unidisk 5.25's, two 3.5" drives, two Disk II's, a SCSI card, RAM
> > expansion, etc, etc, it the computer sometimes can't get the juice to
> > power drives, I/O, etc (especially those pesky Disk II's)... Try
> > measuring voltages at the power supply, it should have the pinouts
> > printed on it IIRC. If you want, I have a spare IIgs or two that you
> > can have for a few bucks plus shipping. I also have IIe's and floppy
> > drives as well, if you want.
> >
> > Ian Primus
> > ian_primus_at_yahoo.com
Received on Wed Jun 04 2003 - 20:49:00 BST