i have one of these http://www.brielcomputers.com/wordpress/?cat=11 and they use a avr8515 @ 16mhz the 8080 runs about ~1.5mhz ----- Original Message ----- From: "Didier Derny" <firstname.lastname@example.org> To: <email@example.com> Sent: Saturday, December 10, 2011 11:13 PM Subject: emulation of a cbm8032 screen on a serial terminal (need some advices) > Hi > > I'm thinking to the emulation of the cbm8032 screen on a pocketerm > modified > > I'thinking to modify the pocketerm as follow: > - spi bus to communicate with the avr 128A1 xplained. > (apparently with the propeller it is possible to reach about 1 Mhz but > not > beyond) > - font modified in the propeller firmware to support commodore graphic > characters. > - font switching via a command send to the terminal. > - keyboard code modified to create commodore codes > (not really worked on this par but I have a few idea coming from my old > emulator) > > The fastest writing loop on the cbm screen is probably this sequence: > > Loop sta $(xx),y 6 cycles > iny 2 cycles > bne 3 cycles > > so a t 1 Mhz 83333 char /sec > (1000000/12 * 10) = 833330 bits /sec (8 bits + start + stop) > > if the addess change: from the previous write > jocker + line + col > > but I guess that the writing in the screen is rarely random... > > while we are on the same line, we send the byte one after the others... > char + char + char > > but if the char is the same the char + a jocker + a rep count is sent. > char + escape code + rep count > > all write a not immediate but after a short time so there is a chance > to create a string with a repeat count. > > My problem is the scroll, the scroll is really expensive, I'm thinking to > Way to detect a scroll with a code not too expensive but without any > Modification in commodore kernel. > > If I could find a way to detect it, I could send a scroll up/down command > To the propeller > > Any idea for a scroll detection ? > > Thanks > > -- > Didier > > > > > > > > > > > Message was sent through the cbm-hackers mailing list > > __________ Information from ESET NOD32 Antivirus, version of virus > signature database 6496 (20110926) __________ > > The message was checked by ESET NOD32 Antivirus. > > http://www.eset.com > > > Message was sent through the cbm-hackers mailing listReceived on 2011-12-11 01:00:05
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