1 Apr
2009
1 Apr
'09
3:44 p.m.
Anyone have a manual/schematics for Microangelo MA520 S-100 card ?
All the sites that I bookmarked come up empty.
I'm trying to fix the one I have here.
It's also missing a chip at U5
I don't have a photo of the card either to determine the part#, just the
early revision model.
thanks !
=Dan
--
[ = http://www2.applegate.org/~ragooman/ ]
1 Apr
1 Apr
4:11 p.m.
On 1 Apr 2009 at 18:44, Dan Roganti wrote:
Anyone have a manual/schematics for Microangelo MA520
S-100 card ? All
the sites that I bookmarked come up empty. I'm trying to fix the one I
have here. It's also missing a chip at U5 I don't have a photo of the
card either to determine the part#, just the early revision model.
A google search turns up this guy who seems to be a MicroAngelo
expert:
http://www.citilink.com/~delscott/
Also, there's a high-resolution image here:
http://gallery.brouhaha.com/d/8618-1/img_0266.jpg
That makes U5 look like a 7490.
Cheers,
Chuck
4:43 p.m.
Chuck Guzis wrote:
On 1 Apr 2009 at 18:44, Dan Roganti wrote:
Yes, I found his website before, but I haven't rcvd a reply over several
months ago from him.
I can always try again in case my email was lost in the bit bucket.
That photo really helps - I somehow overlooked that link - thanks !
I contacted the web owner there too in case he might have one.
So I'm still on the lookout.
=Dan
--
[ = http://www2.applegate.org/~ragooman/ ]
Anyone have a manual/schematics for Microangelo
MA520 S-100 card ? All
the sites that I bookmarked come up empty. I'm trying to fix the one I
have here. It's also missing a chip at U5 I don't have a photo of the
card either to determine the part#, just the early revision model.
A google search turns up this guy who seems to be a MicroAngelo
expert:
http://www.citilink.com/~delscott/
Also, there's a high-resolution image here:
http://gallery.brouhaha.com/d/8618-1/img_0266.jpg
That makes U5 look like a 7490.
5:13 p.m.
On 1 Apr 2009 at 19:43, Dan Roganti wrote:
That photo really helps - I somehow overlooked that
link - thanks ! I
contacted the web owner there too in case he might have one. So I'm
still on the lookout.
What struck me about the chip at U5 is that it's a DM7490AN, not an
LS90. (or even an S90 or F90). I wonder if this was intentional or
what was simply on hand.
--Chuck
6:23 p.m.
Chuck Guzis wrote:
On 1 Apr 2009 at 19:43, Dan Roganti wrote:
I'm not sure yet, but it's not the first time-- I see this in many of
the early stuff that I work on. I always keep a bunch of the 7490 in my
parts bin - just in case- . But what's also strange is that his photo is
missing Q1, Q2 while the resistors are still onboard--because it's
connected to J15, which pins 1,2 are normally connected via a small
trace(difficult to distinguish in the photo) Plus mine has a mod with
another 2 transistors wired into the pads of connector JC from U3 and U4
to connector JB.
So I hope I can decipher this once I find the manual.
=Dan
[ = http://www2.applegate.org/~ragooman/ ]
That photo really helps - I somehow overlooked
that link - thanks ! I
contacted the web owner there too in case he might have one. So I'm
still on the lookout.
What struck me about the chip at U5 is that it's a DM7490AN, not an
LS90. (or even an S90 or F90). I wonder if this was intentional or
what was simply on hand
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