15 Nov
2006
15 Nov
'06
11:17 p.m.
I seek a MOS 6545-1 (or Motorola's MC6845) is for a CBM 8296
motherboard. The chip is running hot and there is no screen output. The
6545 is the Cathode Ray Controller for the built-in monitor. Anyone with
information on how I may obtain such chip, please let me know
privately. Will pay $$.
Thanks.
Bill D
16 Nov
16 Nov
12:16 p.m.
B. Degnan schrieb:
I seek a MOS 6545-1 (or Motorola's MC6845) is for
a CBM 8296
motherboard. The chip is running hot and there is no screen output.
The 6545 is the Cathode Ray Controller for the built-in monitor.
Anyone with information on how I may obtain such chip, please let me
know privately. Will pay $$.
Thanks.
Bill D
The 6545 and 6845 is still so common that it is no problem to obtain
one. Look at www.unicornelectronics.com, for instance.
--
Holger Veit
4:44 p.m.
--- Holger Veit <holger.veit at iais.fraunhofer.de>
wrote:
B. Degnan schrieb:
Or desolder it from a CGA card or any other IBM
compatible with built in video. I recommend a cool
water wave tank for the process.
Are they absolute drop in replacements for one another?
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I seek a MOS 6545-1 (or Motorola's MC6845) is
for
a CBM 8296
motherboard. The chip is running hot and there
is
no screen output.
The 6545 is the Cathode Ray Controller for the
built-in monitor.
Anyone with information on how I may obtain such
chip, please let me
know privately. Will pay $$.
Thanks.
Bill D
The 6545 and 6845 is still so common that it is no
problem to obtain
one. Look at www.unicornelectronics.com, for
instance.
--
Holger Veit 
5:09 p.m.
On 16 Nov 2006 at 13:44, Chris M wrote:
Or desolder it from a CGA card or any other IBM
compatible with built in video. I recommend a cool
water wave tank for the process.
You know, when desoldering a chip such as a 40-pin DIP like the 6545,
I've never gotten the chip body anywhere near being too hot to touch.
As a matter of fact, I'd worry that the water would conduct too much
heat away from the chip to allow the PCB solder to melt quickly.
Are they absolute drop in replacements for one
another?
My copy of the 6545 chip datasheet states that it's pin-compatible
with the 6845. At first blush, the chip programming looks to be
identical, but there might be some electrical parameters that are
sensitive to chip choice.
Cheers,
Chuck
18 Nov
18 Nov
3:01 p.m.
Chuck Guzis wrote:
On 16 Nov 2006 at 13:44, Chris M wrote:
I've always found that if the board isn't important but the chip is, a
quick blast with the hot-air paint stripper will desolder it quite well.
Often you can just pull the chip out with your fingers, because it stays
fairly cool. If it really doesn't want to come out, tap it on a piece
of wood and it will drop out.
Gordon.
Or desolder it from a CGA card or any other IBM
compatible with built in video. I recommend a cool
water wave tank for the process.
You know, when desoldering a chip such as a 40-pin DIP like the 6545,
I've never gotten the chip body anywhere near being too hot to touch.
As a matter of fact, I'd worry that the water would conduct too much
heat away from the chip to allow the PCB solder to melt quickly. 
19 Nov
19 Nov
4:35 p.m.
At 8:01 PM +0000 11/18/06, Gordon JC Pearce wrote:
Chuck Guzis wrote:
I've used a propane torch to preheat the board, then whack it solder
side down to blow the solder off, then flip over and whack on the
component side to remove most of the ICs.
Not the best, but it IS fast and usually results in recoverable ICs.
John :-#)#
--
John's Jukes Ltd. 2343 Main St., Vancouver, BC, Canada V5T 3C9
Call (604)872-5757 or Fax 872-2010 (Pinballs, Jukes, VideoGames)
www.flippers.com
"Old pinballers never die, they just flip out"
On 16 Nov 2006 at 13:44, Chris M wrote:
I've always found that if the board isn't important but the chip is,
a quick blast with the hot-air paint stripper will desolder it quite
well.
Often you can just pull the chip out with your fingers, because it
stays fairly cool. If it really doesn't want to come out, tap it on
a piece of wood and it will drop out.
Gordon. Or desolder it from a CGA card or any other IBM
compatible with built in video. I recommend a cool
water wave tank for the process.
You know, when desoldering a chip such as a 40-pin DIP like the
6545, I've never gotten the chip body anywhere near being too hot
to touch. As a matter of fact, I'd worry that the water would
conduct too much heat away from the chip to allow the PCB solder to
melt quickly.
17 Nov
17 Nov
10:03 a.m.
At 1:44 PM -0800 11/16/06, Chris M wrote:
--- Holger Veit <holger.veit at
iais.fraunhofer.de>
wrote:
...
OK, what the heck is a 'cool water wave tank' for desoldering and how
do I make one???
Google search did not turn up anything called that...
John :-#)#
B. Degnan schrieb:
...
Or desolder it from a CGA card or any other IBM
compatible with built in video. I recommend a cool
water wave tank for the process.
6460
days inactive
6463
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6 comments
6 participants
participants (6)
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billdeg＠degnanco.com -
cclist＠sydex.com -
chrism3667＠yahoo.com -
gordon＠gjcp.net -
holger.veit＠iais.fraunhofer.de -
jrr＠flippers.com