On Fri, 7 Feb 2003, Jim Keohane wrote: No 6502 instruction takes less than 2 cycles to complete. Sellam Ismail Vintage Computer Festival ------------------------------------------------------------------------------ International Man of Intrigue and Danger http://www.vintage.org * Old computing resources for business and academia at www.VintageTech.com *

On Sat, 8 Feb 2003, Jim Keohane wrote: Ok, I didn't realize that "one cycle" != 1 CPU cycle. I just know that I have a handy chart of how many clock cycles an instruction takes and the minimum number for any instruction is 2. I guess the key phrase is "clock cycles". Perhaps it's just semantics? I don't know myself. Sellam Ismail Vintage Computer Festival ------------------------------------------------------------------------------ International Man of Intrigue and Danger http://www.vintage.org * Old computing resources for business and academia at www.VintageTech.com *

I used BigMac for all my projects, including the doomed SSC ROM... (*1) Gruss H. (*1) I don't know if I already told the story -- VCF Europa 4.0 am 03./04. Mai 2003 in Muenchen http://www.vcfe.org/

Well, It was around 1982 when a friend of mine designed a nice combo card for the apple, at his kitchen table (*1), featuring a 6522 based paralell port, a clock and a SCC compatible serial port. Since I had way to much time on my hand, and did love to programm the Apple, I did the DOS and ProDOS drivers for the clock, and build a 4 system disk, DOS and ProDOS file system on one side, CP/M and Pascal on the other... As I said, the Serial part was 100% SSC compatible, you could just drop in a SSC-ROM to get it working. Mathias had some concerns to just copy the ROM, but he wanted to give our future customers something, so I stared to completly redo the ROM without changeing any known and used entry point.... part of the work was to move code around, but it's not that easy. The Code didn't offer a lot of redundancy, and entry points where scattered all over - one of the bad featured about well docunented software, available in source to everyone (the listing was part of the manual) is that people tend to realy use it. Sp part of the work was figuring out what official and otherwise addresses have been used in various software packets. It took me about a month to redo the ROM. At the end no codesegment larger than 50 bytes was still the same, and less than 70 bytes where still at the same location. Now, when I finaly delivered the ROM I was more than happy. Mathias went the very next day to Apple Germayn (their HQ was at this time just on the other end of town), to show them our card, and he also told them about our full compatible ROM ... just to learn that they didn't had any objections against using A STRAIGHT COPY ... Well, it, lets say, took away a bit of my pride about the new ROM ... That's the story ... Gruss H. (*1) in fact, this was the start of FAST Electronic, later one a quite successful venture, with successfull products europes leading copy protection dongle (Hard-Lock) and a TiVo like digital TV solution - later on Aladdin bought the Copy Protection parts, and He kept the multi media devision... but that spanns 20 years from that kitchen table. -- VCF Europa 4.0 am 03./04. Mai 2003 in Muenchen http://www.vcfe.org/

I'm doing the same thing on my dual G4, except it's xa and Power64. :-) (This beats crash-and-reload cycles on the 128 with TurboAss!) -- ----------------------------- personal page: http://www.armory.com/~spectre/ -- Cameron Kaiser, Point Loma Nazarene University * ckaiser(a)stockholm.ptloma.edu -- What you don't mean, can't hurt you. -- Firesign Theater -------------------

On Fri, 7 Feb 2003, Hans Franke wrote: Not that just setting these addresses does not automatically move the cursor. You must also call $FBC1, which calculates the base address of the screen memory where the cursor is and updates the requisite zero page addresses. Ron, I have a copy of the DOS manual if you need it. Sellam Ismail Vintage Computer Festival ------------------------------------------------------------------------------ International Man of Intrigue and Danger http://www.vintage.org * Old computing resources for business and academia at www.VintageTech.com *

On Sat, 8 Feb 2003, Ron Hudson wrote: Yes. The ROM is fundamentally the same. There are some significant differences but an Apple ][ is an Apple ][ for the most part. Sellam Ismail Vintage Computer Festival ------------------------------------------------------------------------------ International Man of Intrigue and Danger http://www.vintage.org * Old computing resources for business and academia at www.VintageTech.com *