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daver2
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daver2
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Today,
01:53 PM
daver2
replied to a thread
Memory problem with PET 2001
in
Commodore
Hi Greg, You need to be a little bit careful with what you are looking at on a scope / logic analyser. You need to know what is happening on the...
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33 replies | 968 view(s)
Today,
11:57 AM
daver2
replied to a thread
Help with fixing Commodore 2040 Dual Floppy drive
in
Commodore
Forget the drive for now - and concentrate on the PET IEEE port. As I stated back in post #3, we have already gone through a process of...
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8 replies | 68 view(s)
Today,
02:24 AM
daver2
replied to a thread
Help with fixing Commodore 2040 Dual Floppy drive
in
Commodore
There is another very recent thread on the forum where we did exactly this and tested the IEEE port in isolation from anything else. The other...
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8 replies | 68 view(s)
Today,
02:18 AM
daver2
replied to a thread
CBM 8032 - What does the startup chirp actually mean?
in
Commodore
Set ourselves the goal of getting space invaders running! Dave
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157 replies | 6639 view(s)
Today,
02:06 AM
daver2
replied to a thread
Aim-65 video card mystery
in
Vintage Computer Hardware
One of the documents I read yesterday I am sure had the bit patterns for the character generator in it. Dave
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13 replies | 164 view(s)
Yesterday,
01:59 PM
daver2
replied to a thread
CBM 8032 - What does the startup chirp actually mean?
in
Commodore
Well done that man :-)! Have you tested all of the PET functions yet? Do you have a cassette to load space invaders for example!!! We have...
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157 replies | 6639 view(s)
Yesterday,
10:04 AM
daver2
replied to a thread
Aim-65 video card mystery
in
Vintage Computer Hardware
I fired up my AIM-65 emulator this afternoon and I found that it already contained the AIM 65 DOS VERSION 1.0 ROM image. I remember now what the...
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13 replies | 164 view(s)
Yesterday,
08:38 AM
daver2
replied to a thread
Microkit 8/16
in
Other
I was merging the screen display from the other 'half' of the EPROM - but I am not making much sense of it... Can you just confirm the wiring of...
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81 replies | 5857 view(s)
Yesterday,
04:40 AM
daver2
replied to a thread
Aim-65 video card mystery
in
Vintage Computer Hardware
I am guessing (from looking at the photograph) that there are two parts to this. 1. Is an adapter from the expansion bus to a ‘commercial’ bus....
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13 replies | 164 view(s)
Yesterday,
04:35 AM
daver2
replied to a thread
Fun with New AIM-65
in
Vintage Computer Hardware
Nice purchase! Dave
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4 replies | 85 view(s)
January 16th, 2021,
10:38 AM
daver2
replied to a thread
Microkit 8/16
in
Other
I can't answer that question though. Is there a -9V generator on the board? Presumably you can follow the -9V pin(s) from the EPROM to where it...
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81 replies | 5857 view(s)
January 16th, 2021,
10:32 AM
daver2
replied to a thread
What did I do to my PDP-8 today.
in
DEC
Excellent work Tom. Dave
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122 replies | 9022 view(s)
January 16th, 2021,
03:09 AM
daver2
replied to a thread
Can someone help me re-install windows on......
in
General Off Topic
This information is from soooo long ago! Use the Windows Installation disk. Answer the language and time questions. Click Next. Select...
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3 replies | 88 view(s)
January 14th, 2021,
12:01 AM
daver2
replied to a thread
Memory problem with PET 2001
in
Commodore
At 1V/div those traces are even more suspect... We need to ‘poke around’ the databus buffers first... Dave
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33 replies | 968 view(s)
January 13th, 2021,
09:04 AM
daver2
replied to a thread
Dr. Suding questions
in
General Vintage Computer Discussions
I thought I would be a bit controversial for a change... Going from a Z80 to an 8080 (or 8085) would be a nightmare, the other way is relatively...
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21 replies | 436 view(s)
January 13th, 2021,
01:03 AM
daver2
replied to a thread
Dr. Suding questions
in
General Vintage Computer Discussions
There is something not ringing true here... We know for a fact that the 8080 variant of Altair BASIC does not run on a Z80. There are some slight...
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21 replies | 436 view(s)
January 12th, 2021,
02:16 PM
daver2
replied to a thread
Memory problem with PET 2001
in
Commodore
Even at 5V/div and no timebase information - they do look suspect to me on first glance... I would suggest having a look at pins 1 and 19 of the...
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33 replies | 968 view(s)
January 12th, 2021,
11:32 AM
daver2
replied to a thread
Dr. Suding questions
in
General Vintage Computer Discussions
Zilog would have had test systems and a development system of some kind. Reference is even made to a development system for the Z80 in the...
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21 replies | 436 view(s)
January 11th, 2021,
07:22 AM
daver2
replied to a thread
Memory problem with PET 2001
in
Commodore
Yep, I did process that. I just wanted to add a warning about not connecting a LS TTL logic signal directly to +5V. You could replace the pull-up...
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33 replies | 968 view(s)
January 10th, 2021,
03:23 PM
daver2
replied to a thread
Memory problem with PET 2001
in
Commodore
Most things have a logical cause when you get into them! 4.75V on /INIT is fine. I wouldn’t bother with anything else. Just a warning, don’t wire...
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33 replies | 968 view(s)
January 10th, 2021,
12:03 PM
daver2
replied to a thread
Bought some random stuff
in
General Vintage Computer Discussions
A 'modern' 1702 programmer (is there such I thing I ask myself) would probably be serial or centronics parallel - hence the 25 way plug or socket. ...
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14 replies | 407 view(s)
January 10th, 2021,
04:54 AM
daver2
replied to a thread
PET power transformer.
in
Commodore
>>> Correct, I think he should know this, as he used another PET "PSU" to power-on the board. There is a little more to the interconnection of the...
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6 replies | 209 view(s)
January 10th, 2021,
04:42 AM
daver2
replied to a thread
Genrad 2115
in
DEC
As this is your first post - welcome to VCFED. Don't forget to put your location into your profile. You never know, there may be some more VCFED...
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4 replies | 182 view(s)
January 10th, 2021,
03:59 AM
daver2
replied to a thread
Vintage power supplies (PSUs), powering up, and the +3.3 V. orange wire
in
Vintage Computer Hardware
I would like to bet that all he has done is to probe around on the motherboard with his multimeter. The PDF file is the data sheet for the device...
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14 replies | 516 view(s)
January 9th, 2021,
08:13 AM
daver2
replied to a thread
PDP-8 core memory troubleshooting
in
DEC
Thanks, I was looking at the schematic for the X-Y driver... One possibility to think about would be an ac signal generator coupled to the faulty...
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69 replies | 3041 view(s)
January 9th, 2021,
08:06 AM
daver2
replied to a thread
PET power transformer.
in
Commodore
Don’t forget that the large smoothing capacitor is also external to the PET mainboard. Dave
see more
6 replies | 209 view(s)
January 8th, 2021,
01:05 PM
daver2
replied to a thread
PDP-8 core memory troubleshooting
in
DEC
Looking at the schematics for the H212 (MM8-EJ) I see that EMA2 appears on drawing sheet 3 and is coupled to E14 pin 9 via wire link W1. EMA2...
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69 replies | 3041 view(s)
January 8th, 2021,
12:43 PM
daver2
replied to a thread
Memory problem with PET 2001
in
Commodore
>>> I haven't had a chance to try any of the suggestions, but just wanted to resolve your confusion due to my less-than well-organized post above....
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33 replies | 968 view(s)
January 8th, 2021,
10:18 AM
daver2
replied to a thread
Memory problem with PET 2001
in
Commodore
Good catch Dave. Dave
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33 replies | 968 view(s)
January 8th, 2021,
02:25 AM
daver2
replied to a thread
Memory problem with PET 2001
in
Commodore
I am getting a little confused now... With the NOP generator in place, you should see each ROM /CS pin being selected (in turn) for 1/16th of the...
see more
33 replies | 968 view(s)
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UK - Worcester
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SW/HW design engineer
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