davec@tektronix.UUCP (Dave Clemans) (09/22/83)
Does anyone know how to get graphics out of a VIC-20 without buying CBM's Super Expander Cartridge??? I can't quite figure out how it's done... The Super Expander has a resolution of 160x160 pixels. Each character cell is 8x8, which would require 20x20, or 400, unique characters when only 256 are possible with 8 bit data. The Video Chip (a 6560, I think) has a 12 bit data bus, the upper four used for color. Are these possibly being used to increase the character addressing to 9 bits??? If anyone knows the answer, I would appreciate hearing from you via mail. Thanx, Greg Muth aka tektronix!gregorym
burke@ittral.UUCP (Michael G. Burke) (09/23/83)
The superexpander uses the vic chip in a mode where each character is defined by a 16 by 8 array, i.e the screen is actually showing 10 lines of 20 double height characters. See the programmers reference guide for furthur info.
gregorym@tektronix.UUCP (Gregory Muth) (09/29/83)
I don't know why my article asking about VIC-20 graphics has someone elses path name??? If you reply to the article, please send mail to "tektronix!gregorym" thanx, greg muth