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Post by eslapion on Jul 23, 2016 4:31:12 GMT
I don't see any game thread. I am sure there must be some games for the C128 in 128 mode.
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Post by eslapion on Jul 23, 2016 4:25:55 GMT
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Post by eslapion on Jul 23, 2016 4:18:27 GMT
Back in the Maurice Scandall days, I noticed a file circulating around which contained a bunch of JiffyDOS ROM images. Unfortunately, the C128 JiffyDOS it contained was corrupt. I then enterprised to split in sections the good JiffyDOS for C128D that I had - a european gentleman sent me an original C128D JiffyDOS.
On the Normal C128, JiffyDOS requires 2 different chips since one is for the C128 mode and the other is for the C64 mode and is identical to what is used in the C64c. In the C128D, both chips are combined into one so resplitting it back in 2 components to get JiffyDOS for the flat 128 proved to be quite a tedious job but the result was JiffyDOS for the C128 which worked perfectly well.
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Post by eslapion on Jul 23, 2016 3:38:37 GMT
... the VDC can be put into PAL or NTSC mode by software: Set to NTSC: SYS DEC("CDCC"),32,4:SYS DEC("CDCC"),29,7:SYS DEC("CDCC"),126,0 Set to PAL: SYS DEC("CDCC"),38,4:SYS DEC("CDCC"),32,7:SYS DEC("CDCC"),127,0 Now that's quite handy!! I have an old RGBi to analog RGB converter along with an Ambery AV-1 and even if it works, the result is somewhat blurry. I have better results using the monochrome 80 column output from the DB-9. I know the problem is not caused by the Ambery as I have used it in the past as a flicker fixer for an Amiga 500 and the result was excellent. I suspect the digital buffer (74ACT244) on the RGBi 2 RGB board isn't fast enough. Also, since the RGBi 2 RGB converter is supposed to give a signal which resembles that coming from an Amiga, you'd expect the 15kHz RGB to work on an Amiga monitor but it didn't; why is that ? Different type of sync ? Any advice on this ?
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Post by eslapion on Jul 23, 2016 3:31:13 GMT
I have had a C128 since 2006 but I do so incredibly little with it.
There are dozens of things I can think of doing with it but never got to it.
The first thing I would like to do is develop an RGBi to S-Video adapter using the newly acquired knowledge from the investigation of the 6561 by lance.ewing on the Denial forum. Now I have a pretty good idea how the VIC-I/II generated the color signal.
Another thing I would like to do is a PLA tester which is fast enough and checks all 65536 possible combinations.
Worth mentioning, I also have a 1581 and 1571 drives which can help take advantage of this nice machine.
A drawback, my 128 only has 16k of VDC DRAM but since I know it only requires changing the 41416 to 41464 to get to 64k, I will probably do it when I feel brave enough.
Also, I noted that when the 128 is in 64 mode, it is possible to push the CPU to 2MHz mode during the blanking intervals and a few games take advantage of this. I have noted Gunship and Stealth Fighter but I guess there are others.
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