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daver2
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daver2
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Today,
12:15 PM
daver2
replied to a thread
Intermittent screen problem on PET/CBM 8032
in
Commodore
Hi Mike, The brightness is increasing over time. It is probably in the monitor itself rather than the main logic board. Possibly a component...
see more
1 replies | 16 view(s)
Today,
10:48 AM
daver2
replied to a thread
SBC6120 - IOB6120 FLASH trouble
in
DEC
Have a good rest! I would check pin 2 (GROUP_1_IOT), pin 1 (GROUP_2_IOT), pin 6 (WRITE) and pins 3, 4 and 5 (MA9, 10 and 11) around PAL IOT2 to...
see more
23 replies | 600 view(s)
Today,
09:10 AM
daver2
replied to a thread
SBC6120 - IOB6120 FLASH trouble
in
DEC
>>> Why??? $64,000 question... BTS is running in panel mode isn't it - not in 'user program' space. I wonder if that is pointing us in the...
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23 replies | 600 view(s)
Today,
08:06 AM
daver2
replied to a thread
SBC6120 - IOB6120 FLASH trouble
in
DEC
>>> Not much would work otherwise anyway. Just thought I would mention it though... I had to try very, very hard to put IOT2 in 'the wrong way'...
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23 replies | 600 view(s)
Today,
05:14 AM
daver2
replied to a thread
SBC6120 - IOB6120 FLASH trouble
in
DEC
You are aware that the IOT2 PAL is installed on the board ‘backwards’ (i.e. the opposite way round to all of the other ICs with the same...
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23 replies | 600 view(s)
Yesterday,
09:16 AM
daver2
replied to a thread
SBC6120 - IOB6120 FLASH trouble
in
DEC
>>> Don't I just issue the 6410 IOT which takes the contents of ACC and pokes that out on the data bus. Yes, but the signal will only be active...
see more
23 replies | 600 view(s)
Yesterday,
06:08 AM
daver2
replied to a thread
SBC6120 - IOB6120 FLASH trouble
in
DEC
>>> I subsequently reprogrammed the Lattice GAL22V10B successfully to match Bob's original IOT2.jed. The trouble is that you may now have...
see more
23 replies | 600 view(s)
Yesterday,
05:40 AM
daver2
replied to a thread
Apple ][+ rolling video started today
in
Early Apple (I, ][, ///, etc.)
The thing to watch out for with 4164 DRAM is whether they are 128 or 256 cycle refresh devices. 128 cycle DRAM will work in place of 256 cycle...
see more
7 replies | 127 view(s)
Yesterday,
03:26 AM
daver2
replied to a thread
Apple ][+ rolling video started today
in
Early Apple (I, ][, ///, etc.)
I checked the online schematics and the ICs referenced (B14 and C11) are the types as specified. There must be at least two (2) revisions of the...
see more
7 replies | 127 view(s)
January 22nd, 2021,
07:21 AM
daver2
replied to a thread
Aim-65 video card mystery
in
Vintage Computer Hardware
I see you have found some DIN connectors. If you run out, I may have access to some. I think I have right-angled male plugs (solder type) and...
see more
32 replies | 566 view(s)
January 22nd, 2021,
07:15 AM
daver2
replied to a thread
Memory problem with PET 2001
in
Commodore
Assuming RDx is the RAM Data, then the logic analyser is indicating potential problems somewhere... Unfortunately, a logic analyser is no good for...
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52 replies | 1635 view(s)
January 21st, 2021,
02:52 PM
daver2
replied to a thread
Aim-65 video card mystery
in
Vintage Computer Hardware
Getting there ... Dave
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32 replies | 566 view(s)
January 21st, 2021,
07:58 AM
daver2
replied to a thread
Aim-65 video card mystery
in
Vintage Computer Hardware
This is the best photograph of the top of the buffer board I have been able to find: ...
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32 replies | 566 view(s)
January 21st, 2021,
04:22 AM
daver2
replied to a thread
Memory problem with PET 2001
in
Commodore
I suppose it is also worth pointing out that there are two (2) +5V regulators (and, therefore, two +5V rails) on the PET 2001N. Obviously, both dc...
see more
52 replies | 1635 view(s)
January 21st, 2021,
03:52 AM
daver2
replied to a thread
Aim-65 video card mystery
in
Vintage Computer Hardware
The AIM-65 is supposed to interface to the serial world via a 20 mA current loop. However, with the addition of an RS232 transmitter buffer, it...
see more
32 replies | 566 view(s)
January 21st, 2021,
03:02 AM
daver2
replied to a thread
Memory problem with PET 2001
in
Commodore
Post #28 should cover the rail voltages. Worth double-checking them though with an oscilloscope - looking for dc level and ripple/noise. That...
see more
52 replies | 1635 view(s)
January 20th, 2021,
07:26 AM
daver2
replied to a thread
What did I do to my PDP-8 today.
in
DEC
Tom, Yes, the text "write" appears to be hard-coded where the warning appears - but the previous messages correctly identify the transaction as a...
see more
163 replies | 10320 view(s)
January 20th, 2021,
12:52 AM
daver2
replied to a thread
Memory problem with PET 2001
in
Commodore
Those traces look fine to me (on a quick check at least). As you can see, triggers are the all important factor with both an oscilloscope and a...
see more
52 replies | 1635 view(s)
January 19th, 2021,
07:56 AM
daver2
replied to a thread
What did I do to my PDP-8 today.
in
DEC
>>> On my Straight 8, PAL opens the side panel and an arm with an open hand reaches out and slaps the programmer silly. I can think of quite a few...
see more
163 replies | 10320 view(s)
January 19th, 2021,
07:53 AM
daver2
replied to a thread
What did I do to my PDP-8 today.
in
DEC
There is a file on the disk called CHESS.TXT. Suggest reading it... It is also here...
see more
163 replies | 10320 view(s)
January 19th, 2021,
04:59 AM
daver2
replied to a thread
What did I do to my PDP-8 today.
in
DEC
There might be a clue here. https://raymii.org/s/articles/Creating_an_OS8_RK05_system_disk_from_RX01_floppies_for_the_PDP-8_with_SIMH.html#toc_2 ...
see more
163 replies | 10320 view(s)
January 18th, 2021,
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...
see more
52 replies | 1635 view(s)
January 18th, 2021,
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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13 replies | 136 view(s)
January 18th, 2021,
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...
see more
13 replies | 136 view(s)
January 18th, 2021,
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
see more
157 replies | 7166 view(s)
January 18th, 2021,
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
see more
32 replies | 566 view(s)
January 17th, 2021,
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...
see more
157 replies | 7166 view(s)
January 17th, 2021,
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...
see more
32 replies | 566 view(s)
January 17th, 2021,
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...
see more
81 replies | 6092 view(s)
January 17th, 2021,
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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32 replies | 566 view(s)
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