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Posted By

gerliczer
on 2014-11-08
07:02:21
 Re: Converting SID tunes to the Plus/4

The best bet for register remapping is address $FD40. It is supported by all available cards, AFAIK. Some cards also support $FE80. It is of course auto-detectable, as normally these addresses have no connected device behind them, therefore reading these addresses return either the last data bus content or then undefined state of the floating bus. Having SIDs mapped to these addresses results in the expected behaviour, namely reading write only registers will always return the usual value ($FF I think).

The old cards are running at 90% of the C=64's speed, so they sound quite differently. BSZ's new cards have the capability to run the SID at the same speed as in the C=64, but that's not the default setting. It is also capable to use the original $D400 address to program the chip. I suggest to read the documentation at http://bsz.amigaspirit.hu/nae/index.html. Probably it will give answer to most of your questions.



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