Howard Herman wrote: > Subsequently, when Basic 8 programs began to appear both the flat C128 > and C128D had display problems, and I upgraded both computer VDC chips. > As I recall these were relatively expensive, something like $30(US) each > at the time. But the new VDC's let me successfully run all the new > Basic8 programming. Do you have version information of the VDC chips you removed and the ones you got as a replacement? I know that there are some issues when programming bitmap graphics with the very early 8563 VDC, but it can be fixed in software. Since the 128DCR was never shipped with a 8563 at all but with a 8568 I'm very curious why you had to upgrade that chip. The VDC has a software version register, and you can use it to determine your VDC version from software: Chip version 8563R7 and lower 0 (this needs special treatment for bitmap) 8563R8 and higher 1 8568 2 You get the version by reading the lower 3 bits of the VDC status register at $D600. PRINT (PEEK(DEC("D600")) AND 7) should do this. Nicolas - This message was sent through the cbm-hackers mailing list. To unsubscribe: echo unsubscribe | mail email@example.com.
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