On Fri, 16 Mar 2001, Spiro Trikaliotis wrote: > For the BASIC portion, you're right; but the ROMs contain a second part, the > KERNEL. The KERNEL starts at $E3xx, if I remember correctly. It's $e4xx to be exact. Video initialization is one of the first things in the actual KERNAL. > While there aren't really much differences with the BASIC part, except for > what you have described and the USR()-vector, there ARE differences with the > KERNEL part. Yep, like in the jump table. There's no $ff81 (CINT) entry in the VIC-20 ROM. And VIC-20 has separate PAL and NTSC KERNALs while the C64 KERNAL detects PAL/NTSC and has two copies of the RS-232C timing tables. BTW, many routines in the beginning of the VIC-20 BASIC ROM are not shifted by 3 bytes. For instance, $AB1E is $CB1E on the VIC-20. Marko - This message was sent through the cbm-hackers mailing list. To unsubscribe: echo unsubscribe | mail firstname.lastname@example.org.
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