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chatGPZ
Registered: Dec 2001
Posts: 11127 |
Testers needed: unemulated DMA Delay Artefacts
Steve West has reported some interesting findings on yet unemulated DMA Delay Artefacts, see here
We need to collect more data here. If you are able to open up your C64 so you can report back the ASSY and the VICII type, please take a couple minutes and do the following:
- run the vsp-tester.prg (or vsp-tester-ntsc.prg) from here
- report the ASSY and the exact markings on the VICII
The program will display the detected address, and show green border if that address is known good, or red border if not.
- report the border color, and the address it shows
Interesting are tests on all kind of C64s and Videochips, we need to confirm (or not) how certain values are related to certain videochips.
(For those who care: this could be a working emulator detection for a while)
TIA! |
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Walt
Registered: May 2004
Posts: 47 |
Green, 38ff
6569R3 date code 2085 on C64 Reloaded MK2 |
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encore
Registered: Aug 2010
Posts: 61 |
All tested on Reloaded MK1 board
mos6567r8_3984_ntsc - green - 38ff
mos6567r56a_1183_ntsc - cyan - I think it crashed, guess it won't work unless there's a adjusted version for 64 cycles
mos6569r1_2383_pal - green - 3807
mos6569r3_3684_pal - green - 38ff
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alwyz
Registered: Dec 2011
Posts: 31 |
NTSC 250407 Rev A - mos6567r8_2184_ntsc - green - 3Bff (should be 8? Really looks like B on my screen caps. my old CRT isnt the best, apologies if the B makes no sense)
tested a few more times and sometimes this variation would happen on the same machine
NTSC 250407 Rev A - mos6567r8_2184_ntsc - purple - 3BFF
Then after 5 minutes - every subsequent time after (perhaps after warm up it stabilizes?):
NTSC 250407 Rev A - mos6567r8_2184_ntsc - purple - 3FFF |
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JackAsser
Registered: Jun 2002
Posts: 1989 |
This would explain an artefact I never could get rid of in the scroller below the hidden line vector in 1991 (only visible on some c64s). |
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NoiseEHC
Registered: Feb 2005
Posts: 51 |
Also try the same in multicolor, as I had the problem once that it read $3bff on an old machine, and this can be the same bug. |
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Impetigo
Registered: Jun 2004
Posts: 30 |
250469 REV.3
8562R2 XX87
38D7 green
250466
6569R3 0586
38FF green |
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Cruzer
Registered: Dec 2001
Posts: 1048 |
Quoting JackAsserThis would explain an artefact I never could get rid of in the scroller below the hidden line vector in 1991 You were active in 1991? |
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iAN CooG
Registered: May 2002
Posts: 3136 |
1991 |
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Cruzer
Registered: Dec 2001
Posts: 1048 |
Ah! :) |
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Krill
Registered: Apr 2002
Posts: 2850 |
Quoting JackAsserThis would explain an artefact I never could get rid of in the scroller below the hidden line vector in 1991 (only visible on some c64s). Would these findings have helped back then? I.e., clearing not only $3FFF but also $38FF, $3BFF, etc.? |
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