Hallo, > That's why I opted for the VIC-20 routines in the first place. However, > Ruud has a point here: The C64-kernal is available in source, the VIC-20 > one isn't, AFAIK. To be honest, I haven't thought about the VIC-20 at all. The reasons to choose for Andre's SW was 1) the differences between the 6526 and 6522 2) I thought I would be better of with a source which isn't "poluted" with lots of other routines. 3) I thought Andre's converter used a 6522 I downloaded the SW and then I found out it used a 6532. But writing the previous sentence the thought struck me that the PET/CBM uses a 6520 for the userport. So what ever SRC we use, some conversion is needed. The first hurdle is the need for a timer. I'm not familiar with the Kernal of the CBM so I wonder if the timer of the 6522 can be used for this purpose? If so, we have to lent at least this part from the VIC-20. I was thinking of placing the SW in an EPROM in the $9000 or $A000 area. Does the CBM work with vectors thru RAM as the C64 does? If no, it means writing a userinterface as well. Concerning the SRC of the VIC-20, the Data Becker book "64 Intern" contains a list of routines and where to find them in the C64 as well as in the VIC-20. Groetjes, Ruud http://home.hccnet.nl/g.baltissen/index.htm - This message was sent through the cbm-hackers mailing list. To unsubscribe: echo unsubscribe | mail firstname.lastname@example.org.
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