Hi Gregg,
Thanks for all that info! I put in a fresh PRAM battery and noted the polarity.
I did manage to get a very distorted video image on one setting of the Griffin
MAC PNP adapter. Blue only with black lines running horizontally and vertically
every 5 or 6 pixels. Not completely illegible, I was able to open the hard
drive folder and access the control panels.
I definitely think the gView will work although I think I am not likely to keep
this IIsi as I don't know how it will fit in with what I already have in my
collection - I'm more of a classic-style fan.
I think I'll keep the 12" at 512x384. 640x480 is nice but the original
resolution harks back to my early introduction (by fire) to Macintosh in 1995.
I previously used an Apple II in 1982 and loved it!
I'll keep everyone updated on this. I'm just concerned about the film caps
voltage value...
Regards,
Keith
On Monday, 29 December 2014, 7:40, 'Gregg Eshelman' via Vintage Macs
<[email protected]> wrote:
On 12/28/2014 11:35 PM, 'Keith Jamison' via Vintage Macs wrote:
> So I did some more research and thinking it was the internal video, I
> purchased a VGA card that fits in the Nubus riser on the IIsi. I first
> tried the straight adaptor (no display) and then I began the same
> process as before with the Griffin Mac PnP adaptor (again, no display).
You need an adapter that separates synch from the green into horizontal
and vertical synch. Nothing else but an old Apple monitor or other old
monitor+adapter with synch on green support will work with the built in
video.
Google macintosh video sense pins for information on how Apple setup
their old monitors so a Mac would automatically work with them. Each
monitor only supported one resolution, which was chosen for each screen
size so it would display 72 pixels per inch. 72 PPI was a common
publishing standard and since Apple was heavily targeting the publishing
industry with Macintosh and LaserWriter, they wanted what was printed to
exactly match the screen and the only way to do that was to not allow a
monitor's resolution to be changed. Apple eventually realized humans
have the ability to see that two things are identical even when they
don't appear to be exactly the same size - and started having
multi-resolution monitors made for Mac. That of course was still before
Display Data Channel and required adding diodes to the sense pin
configurations.
You have checked the PRAM battery for correct voltage and that it's in
the holder the right way around? Many old Macs will not start up at all
with a dead PRAM battery.
Could also be "It's dead, Keith. I'm a Dr. not an electrician!" Pushing
up the silicon daisies. Will only go *foom* if you run 10,000 volts
through it. Pining for the fiords... In such case, time to hunt up
another IIsi board or find someone who can attempt to fix the one you have.
There is a hack to upgrade the little 12" Mac monitor to the useful
resolution of 640x480 and expand the image to lose the large black
border. No longer 72 PPI, boo-hoo. It's a difficult hack and AFAIK the
how-to was only ever on the web in Japanese - and it's not much at all
close to the 640x480 hack for the Color Classic and Color Classic II.
The IIsi and SE-30 PDS are the same. They are NOT the same as the IIci
"cache slot" which is actually a PDS, but for unknown bizarre Apple-ish
reasons electrically incompatible with the same connector as used in the
other two models.
The IIci type slot was also used in the IIvi and IIvx, and also on CPU
upgrade adapters made by DayStar and other companies for various other
68K Macs.
DO NOT ever directly plug a card designed for the IIci type PDS directly
into the PDS of a IIsi or SE-30. Bad things will happen, usually to the
card but sometimes to the computer.
The oddity is compounded by some dual adapter cards (mostly for the
IIsi) that have one slot straight through and one converted to IIci
style. That's so a CPU upgrade and one SE-30 or IIsi PDS card can be
plugged in at the same time.
*Usually* the two connectors will be labeled. On DayStar adapters the
IIci style slot will be labeled cache card or powercache.
For one specific model of video card, Daystar made a special adapter to
put it first in line before the CPU upgrade because that one card would
not work with their standard adapter.
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