C65 Fast-Mode, SID and NMIs

From: Zed Yago (zed_yago_at_yahoo.com)
Date: 2000-04-12 12:14:12


i am working on a sample-player for the C65, and have
discovered some strange things..

First, NEVER EVER use the SID in FAST-Mode, i have
lost a precious 6581 by doing this.

I have programmed 2 Routines, one which also runs on a
C64, or on a C65 completely in Slow-Mode.

The other Routine runs in Fast-Mode and before each
Access on the SID, switches to Slow-Mode (and back).

So far so good, but the second Program is slower than
the first..

Any Ideas, why the "fast" Program is slower ?

BTW, the player is an NMI-Interrupt, and the
"main"-program just counts, to show how fast it is.

Mit freundlichen Gruessen,
      Andre Kaesmacher


Do You Yahoo!?
Send online invitations with Yahoo! Invites.
This message was sent through the cbm-hackers mailing list.
To unsubscribe: echo unsubscribe | mail cbm-hackers-request@dot.tcm.hut.fi.

Archive generated by hypermail 2.1.1.