I recently received my Indivision AGA MK3, along with an ACA1221lc. Installation went smooth, and at first, everything seemed fine. But I soon noticed a stability issue that manifests in graphics errors (see attached image) and occasional crashes.
First, a few words about my setup:
- Amiga 1200 Rev. 2B, recently recapped, with timing fix (E123C and E125C removed; E121C and E122C weren't present in the first place).
- Indivision AGA MK3
- iComp RTC module, installed on the mainboard (not on the ACA1221lc)
- Internal floppy, external floppy, and external Gotek
- IDE-CF adapter with 4GB Transcend CF card
- Allnet ALL0142+ PCMCIA Network card
- An old Blaupunkt flat TV
I am using the SuperHighRes Interlaced (1280x512) mode via the digital output. I created two 1920x1080 VGA modes (normal and shres) and disabled all presets in the Indivision configuration tool, so it would always choose one of these two.
I first noticed problems when I was copying a backup of my Workbench partition to my network drive. I suspected the ACA121lc, so I removed it and tried again, but after a few minutes the problem was back. I then removed the Indivision and tried again. SuperHighRes Interlaced is almost unbearable via SCART, but now the errors did not occur. (With the Indivision present, the same errors were visible over SCART too.)
I tried this with another mainboard (1.4D, also recently recapped and no timing fix necessary since the offending capacitors had apparently never been populated in the first place) but that did not change anything. I also tried different power supplies: An old heavy A500 power supply, the much lighter black power supply that came with the A1200, and a new Keelog Amiga power supply. This did not seem to make any difference either. What did have a slight effect though was activating the CCKLine Pull-Up in the advanced settings. The graphics errors did not vanish completely but were noticeably reduced.
I also noticed that the Indivision gets rather hot. Not sure if that is normal or cause for concern.
I could not (yet?) reproduce the problem in normal HiRes (640x256) mode. I should also note that the problem does not always occur reliably, but it seems that system load (i.E. copying lots of files over the network) increases the likelyhood.
Any ideas what the cause could be and what I could do to fix this? Please let me know if you need further information and/or measurements. (I have a multimeter and an oscilloscope if that helps, but I would need instructions on what to measure.)