Hi and thanks (again) for the warm welcome... Things aren't that
complicated, just more/new tasks at work with less
pay :-/ but still can afford some hobbies anyway.
Back to our thread, I've been experimenting a bit with the IIsi
and the Radius Pivot
PDS card... first of all, after this period of inactivity, the PSU is misbehaving a bit -- things like firing up on just plugging and then not powering off (yes, the power button is not
at the stuck "server" position) so it's asking for a recap at some point... however, after some warm up period it seems to do just fine for the testing.
To summarize, here are the test conditions:
- Mac IIsi with 33 MiB of RAM, 250 MB HD (stock ROM)
- System 7.5.5 (pretty barebones)
- Apple 12" RGB monitor connected to the built-in video port (to see what's happening!)
- Acer LCD wide-monitor (vintage Mac friendly)
- My Radius ColorPivot IIsi PDS card
- My crude connector (but continuity checked out OK) now with all relevant lines
- 10-dip VGA adapter (the best documented one I have, see my previously posted bottom-left adapter)
Now, the bad news
I can only get the IIsi (with the Radius) to boot after a really cold start
for a couple of minutes won't do), otherwise after the RAM test (takes some time for 33 MiB :I ) the dreaded Death Chimes
are heard (with just a standard pattern on the 12") xx( The few times it boots (from cold) no card is detected by SlotInfo
, or the Monitors
control panel. In this state, the Radius card itself seems to output some signal (64 kHz horizontal and a rather odd 69 Hz
vertical, as stated by the Acer monitor and confirmed by the 'scope) but the image itself mostly consisting of a dot pattern, sometimes moving in a randomly fashion -- but somehow affected by user interaction :?: Tried on another working IIsi I have (9 MiB RAM) but got the very same behaviour...
Then I tried what I suppose to be a very similar
card, except for the interface: the Radius Pivut NuBus
-- same big chips, same VRAM, even the declaration ROM
has exactly the same
contents (have read both with my EPROM programmer). But this card has the usual DA-15 monitor connector, making things much easier. This goes of course thru the NuBus/FPU adapter I have, tested good with many other cards.
No boot problems here... but regardless of the sense code applied (tried the whole list above) this card always
output the aforementioned 64 kHz horiz./ 69 Hz vert.
sync signal, which my Acer monitor mistakenly identifies as "1440x900" and the auto-adjust feature can't center properly -- but the image is definitely present and readable. However, with some DIP settings the 640 x 864
indicate) desktop looks heavily stretched as expected for a portrait
mode on a wide
screen; but some others give the same sync signals but a tilted
desktop, this time identified as 864 x 640
Further investigation makes me think that the only
sense line checked by the card is Sense Line 0
, that is, pin 4. And it only switches between "regular" portrait mode and the tilted
one, but no other modes are generated -- somehow reasonable because of the only Xtal on board. However, my previous testing with that very same card revealed the availability of a few "standard" screen modes, which I can't get right now -- most likely because I used another adapter back then, which (if memory serves) is currently installed on Dad's 7500 and thus far of my reach...
Anyway, if we assume both cards (Pivot IIsi
and Pivot NuBus
) are the same
with just a different interface (which seems reasonable) then that very different behaviour is highly suspicious... maybe I had the bad luck of getting the only malfunctioning unit of these PDS cards, or simply I broke it at some point :I However, I won't rule out that hte card's hardware is fine except for those !"$%&@# PLCC sockets for the decl. ROM, which I know to be "temperamental", to say the least... I did have some troubles reading the ROM, in fact. Will try to clean & tighten that.
Or maybe they're not
the same and I'm doing something wrong with the PDS version... or some software incompatibility (?)... I'm not using any specific extension, but I was hoping the card would be accesible for the desktop, if not getting all of its capabilities.
After I get the PLCC ROM socket revised, I'll check again and let you know.