cs64wbs@sdcc8.ucsd.edu (BRYAN WILLSON) (03/21/91)
I'm wonder if anyone can help me regarding Double Hi-Res graphics. I am aware of how they operate, and I know my computer is correctly "hardware endowed" to do dblhires, but I don't know how to bank switch in order to work with the bank-switched auxiliary memory. The Apple //e tech ref man is of little help. It tells you that you must use bank-switched memory but doesn't tell you how to access bank c1 (as opposed to c0). Anybody know? Thanks in advance.
greg@hoss.unl.edu (Lig Lury Jr.) (03/23/91)
In <17670@sdcc6.ucsd.edu> cs64wbs@sdcc8.ucsd.edu (BRYAN WILLSON) writes: >I'm wonder if anyone can help me regarding Double Hi-Res graphics. >I am aware of how they operate, and I know my computer is correctly >"hardware endowed" to do dblhires, but I don't know how to bank >switch in order to work with the bank-switched auxiliary memory. >The Apple //e tech ref man is of little help. It tells you that you >must use bank-switched memory but doesn't tell you how to access >bank c1 (as opposed to c0). Anybody know? >Thanks in advance. Myself, while fiddling around with the standard RAMdisk /RAM, I discovered that one could save the secondary bank's screen to an empty /RAM and it will be positioned perfectly. I sent this into A+ (or was it inCider...) and they said it didn't work on all systems, but I have yet to find one that it didn't work on. Much easier than having to fool around with a special ML routine. I wrote a simple graphics program in AppleSoft to work with this method. Shall I dig it up and upload it to the .binaries. group? -- /// ____ \\\ "I was going flat out and this thing just strolled past me, | |/ / \ \| | star drive hardly ticking over. Ten seconds later it smashed \\_(\____/)_// straight into the third moon of Jaglan Beta. Amazing-looking ship \_\\\/ though. Looks like a fish, moves like a fish. Steers like a cow."
nagendra@bucsf.bu.edu (nagendra mishr) (03/24/91)
well d-hires memory resides on bank 1. you can easily access this memory by first enable the 80 column card. : pr#3 next enable hires mode : hgr next enable d-hires circuitry : poke -16290,0 if you want to write on bank 0: poke -16300,0 if you want to write to bank 1: poke -16299,0 both banks will be on page i.e. $2000-$4000 so you can save both pictures if you want. : poke -16300,0: ?chr$(4)"bsave pic,a$2000,l$2000" : poke -16299,0: ?chr$(4)"bsave pic.aux,a$2000,l$2000" you have to however do these tings from a program, it will not work from the command line. hope it helps nagendra nagendra@bucsf.bu.edu **************************************************************************** * Destiny is a birth-right. | nagendra@bucsf.bu.edu * * Not wanting it is a decision. | Junior at Bonston University * * Not realizing it is failure. | computer science * ****************************************************************************