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Post by Yukko13 on Jul 7, 2020 22:41:04 GMT
Help needed. Acquired a C128 and Philips CM8833 II. Works fine in 40 column mode but when connected via rgbi cable no ready prompt. I plugged an Amiga into the DB9 And it works fine. Noticed that when i power it on for 80 columns there is like a colourful test screen for a couple of seconds but after that nothing. It has jiffy dos installed would this cause an issue? Or is it a faulty VDC chip?
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Post by Pyrofer on Jul 8, 2020 10:59:40 GMT
You sure the 40/80 key is down?
Run some tests in 40col mode that test the VDC and check the values. Are you sure the monitor had the digital/analogue switch in the right position?
Try just changing the colour of the screen/border on 80 col (you can do all this on the 40 col screen)
Do you have a 128 test cart?
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Post by Yukko13 on Jul 12, 2020 16:40:53 GMT
Hello Pyrofer - thanks for your help. Striped down and checked all unsoldered chips were seated. Re-assembled and it worked! Used it for a couple of days and found that 80% of the time the READY prompt came up the rest I had to hold the 40/80 key down for it to work.
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Post by Pyrofer on Jul 12, 2020 18:10:38 GMT
Sounds like your key is a bit dodgy.. That's a latching key like shift lock and as such not part of the main KB, you can probably de-solder it and remove to clean the thing internally. Yes, re-seating chips is the number 1 fix for the 128  |
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