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Updated 2023-07-12: Hello, Guest! Welcome back, and be sure to check out
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MacOSMonkey's latest activity
M
MacOSMonkey
replied to the thread
SuperMac Spectrum/24 Series III Display Artifact Issue
.
Yes - they are sanded on the original (probably earlier) board. But, now that I think of it, there is no guarantee that the original...
Yesterday at 2:37 PM
M
MacOSMonkey
replied to the thread
SuperMac Spectrum/24 Series III Display Artifact Issue
.
Yes - damage to the part is a possible outcome. Sorry to hear that happened. Maybe you should send the good one and only try to read...
Yesterday at 1:34 PM
M
MacOSMonkey
replied to the thread
SuperMac Spectrum 24/V Display Problems
.
OK - sounds good. The full waveform for U19 should be helpful. Testing every resistor value is not necessarily the same as testing the...
Yesterday at 12:32 PM
M
MacOSMonkey
replied to the thread
SuperMac Spectrum/24 Series III Display Artifact Issue
.
Send the bad one! :D But, if it worked, that would be pretty awesome! :love:
Thursday at 1:13 PM
M
MacOSMonkey
replied to the thread
SuperMac Spectrum 24/V Display Problems
.
I just woke up and had another thought. There might not be anything wrong. The problem might be a missing or broken resistor. You said...
Thursday at 1:08 PM
M
MacOSMonkey
replied to the thread
SuperMac Spectrum/24 Series III Display Artifact Issue
.
I don't think the reading trick is guaranteed -- but maybe Bolle could comment. .I think there's also a chance you might damage the...
Thursday at 12:50 PM
M
MacOSMonkey
replied to the thread
SuperMac Spectrum 24/V Display Problems
.
The other thing to remember is that, in 1-bit mode, the SQD01 shouldn't be doing anything (at least as far as I know), since there is no...
Thursday at 9:35 AM
M
MacOSMonkey
replied to the thread
SuperMac Spectrum/24 Series III Display Artifact Issue
.
No shame there - for either of us - hard to know anything about a 35-year-old de-identified build. ;) But great that you now have a...
Thursday at 4:19 AM
M
MacOSMonkey
replied to the thread
SuperMac Spectrum 24/V Display Problems
.
The MT42C4256 VRAM pins you are looking at have different functions. Some are serial data and others are just data. Also, SDQ is a...
Thursday at 4:15 AM
M
MacOSMonkey
replied to the thread
SuperMac Spectrum/24 Series III Display Artifact Issue
.
Well...I told you they were GALs. Alas, I did my best. :P ^_^
Thursday at 3:51 AM
M
MacOSMonkey
replied to the thread
SuperMac Spectrum/24 Series III Display Artifact Issue
.
Yep - GALs. That board was probably produced later after nobody cared about secrecy. You can compare the serial numbers to check. But...
Thursday at 3:26 AM
M
MacOSMonkey
replied to the thread
SuperMac Spectrum 24/V Display Problems
.
Did you hook up the entire VRAM to the logic analyzer? Try to look at the entire transfer waveform to see what might be wrong with the...
Wednesday at 7:27 PM
M
MacOSMonkey
replied to the thread
SuperMac Spectrum 24/V Display Problems
.
Good job on the debug schematic capture! I would really suggest hooking up a logic analyzer to all the pins on U19 and U21 to see what...
Wednesday at 2:50 PM
M
MacOSMonkey
replied to the thread
SuperMac Spectrum 24/V Display Problems
.
Good job!! You should probably just reflow all the RAM pins and maybe the SMT02 -- but carefully and only after thorough cleaning --...
Apr 18, 2024
M
MacOSMonkey
replied to the thread
SuperMac Spectrum 24/V Display Problems
.
If the traces are damaged, then they will be resistive and/or intermittent. The problem you are seeing with the broken column is 100%...
Apr 16, 2024
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