Path: utzoo!utgpu!news-server.csri.toronto.edu!rutgers!uwvax!jomby.cs.wisc.edu!kolstad
From: kolstad@jomby.cs.wisc.edu (Joel Kolstad)
Newsgroups: comp.sys.cbm
Subject: Re: New Stuf, ETC.
Message-ID: <1991Mar3.010903.14011@spool.cs.wisc.edu>
Date: 3 Mar 91 01:09:03 GMT
References: <91055.133430PNNAGATA@MTUS5.BITNET>
Sender: news@spool.cs.wisc.edu (The News)
Organization: U of Wisconsin CS Dept
Lines: 22

In article <91055.133430PNNAGATA@MTUS5.BITNET> PNNAGATA@MTUS5.BITNET writes:
>Also, did anyone see my program SupraTechnic? (Published in COMPUTE!'s
>Gazette, Nov 88, if I remember right.) It "bit-mapped" the top and bottom
>borders on the C64.  It doesn't use sprites to pull it off either.

Hmm... don't think I saw this.  Tell us how it's done!  As I recall, if you
told VIC to switch from 24 row to 25 row mode on scan lines below 192, you
got a borderless bottom.  If I recall, though, you had to keep the background
color black because there was some "black garbage" down there. :-)

I haven't heard of getting a bitmap, though.  (With the above method, you
could use sprites in the top/bottom border...)

Interestingly enough, the same things happens for the side borders as for the
top/bottom borders if you switch VIC from 38 to 40 column mode at the
corresponding columns.  Unfortunately, this is almost impossible on a 
1MHz 64, and even on a 4MHz 64 eats up too much CPU time to be real useful...
(Since you need to interrupts twice every scan lines... :-( )  And of course,
not many people have 4MHz 64's anyway!

						---Joel Kolstad
						kolstad@jomby.cs.wisc.edu