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Question #1: Am I correct that 80 column mode is the only mode that works over the RGB output? If I switch the C128 to 40 column mode or go to C64 mode only the composite output works.
So, fast forward to today. I have the 1080 and an RGB cable that both work on my C128 so thought I'd try them on my 128D. It does boot into 80 column mode, but the picture scrolls vertically and I cannot get the scrolling to stop no matter how I adjust the 1080 VHOLD knob.
I did a bit of googling (dangerous) and thought the problem might be with the 8563 chip, so I thought I'd open my C128 and C128D and swap the chip between the two to see what happened but found that my C128D had an 8568 chip in its place.So, back to square one. Any suggestions on what could be causing this issue on my C128D? How should I go about trying to solve?
Wellcome in the world of C128 users!
That's strange. Could it be a NTSC/PAL problem?
Before I got the RGB monitor and cable I was messing with the 128D and tried putting it in 80 column mode with only a composite output. Once I did that I could not get it to boot into 128 mode even using 40 columns - just hang on boot. I found I could boot direct into C64 mode by holding the C= key. I thought something fried, but I found that after "resting" the computer for a while 128 mode started working again. I repeated this one more time with the same results which seems very strange, but nonetheless true.
I have the 1080 and an RGB cable that both work on my C128 so thought I'd try them on my 128D. It does boot into 80 column mode, but the picture scrolls vertically and I cannot get the scrolling to stop no matter how I adjust the 1080 VHOLD knob.
Anyway, I want to try another cable with the C128D and 1080 monitor. I assumed the cable I had was good but there is a pin missing, not sure if that's normal.
The 128D was behaving fine during my quick testing, but today I went to play more and once again it will not boot into 128 mode - only 64 mode. I'm sure if I let it rest a while it will start booting.
I'm thinking of going with an SD card interface of some sort... maybe a UIEC or 1541 Ultimate II - but I'm not 100% sure of the differences...