Misunderstandings

Hello Ilya! 28 Jun 01 22:19, Ilya Razuev -> Stanislav Udin: [skipped] SU>> processor? What causes the gain in speed? IR> Previously, there was also an axiom from 1982 -> that there is a program in the lower addresses IR> works faster (separate memory fields) #0000-#8000 ! Not entirely true ;) #0000-#3FFF - ROM, it's fast there. #4000-#7FFF - slow RAM, the video controller is in charge here. #8000-#FFFF - fast RAM In the case of 128K, banks 0 - 3 have no brakes, 4 - 7 are slow. Alexand

Greetings, Aleksandr You're all about Misunderstandings I decided to add some heat to this dialogue. SU>>> processor? What causes the gain in speed? IR>> works faster (separate memory fields) #0000-#8000 ! AM> Not entirely true ;) Hmmmmm... AM> #0000-#3FFF - ROM, it's fast. Ok! AM> #4000-#7FFF - slow RAM, it rules here AM> video controller. Not quite right!!! AM> #8000-#FFFF - fast RAM ????????????? How ? AM> In the case of 128K, banks 0 - 3 have no brakes, 4 - 7 - AM> slow. You know there was such a company HEWSON!!!! So she did it like this #5B00-#8000 main program codes and the rest are sprites and stuff, even read the 40 best procedures It's written there in black and white!!!! Even read the reviews for 96-97, people write that some programs like DIIZY 2, ZINAPS work unnaturally faster than others!!!! Well, we will! .·∙°░▒▓█ Clan BOUNDLESS █▓▒░°∙·. ▀■▄[ZX]√[GIRLS][CvIEW]√[BEER]▄■▀ (500:3432/13.666)

Hello Ilya! 30 Jun 01 23:44, Ilya Razuev -> Aleksandr Majorov: [skipped] AM>> #4000-#7FFF - slow RAM, it rules here AM>> video controller. IR> Not entirely true !!! AM>> #8000-#FFFF - fast RAM IR> ??????????????? What? The company Specke-48 installed two lines of 16K RAM. (And at the very first - generally 16K current.) So, although the video controller only uses addresses #4000-#5AFF, but since the RAM is 16K, then all 16K is slowed down. And the second line is not touched by the video controller - percent It doesn't slow down when turning there. AM>> In the case of 128K, banks 0 - 3 have no brakes, 4 - 7 - AM>> slow. IR> You know there was such a company HEWSON !!!! IR> So she did it like this #5B00-#8000 main program codes IR> and the rest are sprites and so on These are her personal problems. And I myself ran into brake banks. Initially, in MMD 2.20, the modem driver was in the 4th bank. In St. Petersburg, machines with separate memory fields somehow I can't see it - so I didn't check it. And then someone launched a program on a machine with separate fields, and the modem connection refused to work - because Bank number 4 is _slow_. We changed the bank number to 3 - everything worked.In the case of the branded 128, there are two lines of 64K RAM. The video controller accesses one line and reads the screen data (bank 5 or 7). And since he accesses the RAM, then the percentage When I try to access banks 4-7 it slows down. IR> even read the 40 best procedures IR> it says !!!! in black and white Well, just quote what is written there... Here is the book "System programming for ZX-SPECTRUM", it is written in black and white that it _cannot_ be placed in register I values in the range #40-#7F. We'll get a glitch on the branded Speck. IR> Even read the reviews for 96-97, people write that IR> some programs like DIIZY 2, ZINAPS work IR> unnaturally faster than others !!!! This IMHO has nothing to do with separate memory pages. I can write you two programs (in the same addresses) which will work at different speeds. Alexand

Hello, Stanislav! 27 Jun 01 22:46, Stanislav Udin -> All: SU> Somehow a question came to my mind. There is an axiom that on the Spectrum SU> a program located in ROM runs faster than one in RAM. Why is this SU> happens because teams here and there use the same number SU> processor cycles? What causes the gain in speed? The ROM does not have to be shared with the video controller; this memory area belongs to exclusively to the processor, so the whites do not arrive there. When I connected a 32k cache to Scorp, I was convinced of this. Turbo acceleration 200%. By the way, I was desperately stuffing half of the drivers into this cache, a cloud was freed up main memory, and it started flying faster and faster. WBR, Jason. [Team Obituary][Team Friday 13th][Team Evil Maniacs][Team Huge Axes]