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Smooth Color Masked Sprites using fast page flip on 48kHere is a quick demo of using char based sprites using the Page flip method: a) Background is copied to buffer b) Sprites drawn on buffer c) Buffer …
... at #6000, which is in contended memory, and this will have ... -
Techy Z80 questions****** Question 1 ****** Take the instruction SET b, (HL). This is broken down (in machine cycles) as follows (according to Microprocessor Technolo…
... ? Reconstructing the breakdown from the contended memory timings in the FAQ ... -
Techy Z80 questions****** Question 1 ****** Take the instruction SET b, (HL). This is broken down (in machine cycles) as follows (according to Microprocessor Technolo…
... the data bus and is contended in a 3,1,1 ... -
Wanted: Code to wait until Border has been drawnWhen my IM2 interrupt fires, I want to wait until the ULA is past the first line of display before drawing. I know I need to wait about 14300T after…
... can do this either with contended memory (trivial), or by executing ... -
RZX for Sabre WulfI was just about to send an RZX for Sabre Wulf to the RZX Archive when I noticed they don't accept Ultimate's (and other companies' who haven't given…
... got the whole issue of contended IO timings to deal with ... less researched and emulated than contended memory timings. -
SpeedloadersSince I read Lee Tonks' post about the speedloaded version of MM3 he did, I've been playing around with various speedload routines I found on TTFn & …
... loader could only live in contended memory.
I successfully ... -
+2A "Ghost" programHi all - first time posting here, so I'll do a quick background - I was a (far too) dedicated 48k and +2A gamer in my younger days. Thanks to the mi…
... fact they are now in contended RAM.
It's ... -
If you could re-design the Spectrum...Let's suppose you could go back in time to the beginning of the Eighties. The Spectrum is being designed as the revolutionary successor to the alread…
... thus increasing the amount of contended memory needed, making it more ... -
ANN: Shadow of the Unicorn SEShadow of the Unicorn SE is no longer being distributed.
I wrote a program to run SOTU on the +2A/+3 a few years ago. I'm not sure if it runs at the normal speed since more pages are contended but anyway it is a slow game. -
ANN: Shadow of the Unicorn SEShadow of the Unicorn SE is no longer being distributed.
... speed since more pages are contended but anyway it is a ... -
MemoryI am writing a game for the Spectrum and need to store a lot of map data. What is the lowest address I can start to store the data at ?
... that below 32768 memory is contended, meaning that access to it ... -
fzx32 on GP32 progressing nicelyJust to let you know that Rlyeh is working hard on his ZX Spectrum emulator fZX32 for the GP32 and should be released in the near future. Its based…
... frameskip 0 @ 133 mhz with contended memory and sound emulation,
- Preliminary contended memory emulation (multicolor effects),
Fuse Emulator & Manic MinerHi All I am trying to run Manic Miner on two different Spectrum emulators on my Mac. Thing is when I load the game in Miner Willy just keeps jumpi…
... credible numbers on my real TC2048 though (including the first wait ...Fuse Emulator & Manic MinerHi All I am trying to run Manic Miner on two different Spectrum emulators on my Mac. Thing is when I load the game in Miner Willy just keeps jumpi…
... credible numbers on my real TC2048 though (including the first wait ...DEC BC/LD A,B/OR C/JP NZ,loopyesterday i saw nice trick:[code] dec bc ld a, b or c jp nz, loop can be replaced (bc starts >255, short jump) by: dec bc inc b djnz loop [/code] …
Saves only 1 cycle when the branch is taken though. Also it would be far slower if the code was in contended memory.128k Shadow Screen?When emulating the shadow screen in bank 7 should that bank be switched into address C000? If so, what happens if bank 7 is switched out without canc…
... two banks of RAM, one contended, the other uncontended (0-3 ...128k Shadow Screen?When emulating the shadow screen in bank 7 should that bank be switched into address C000? If so, what happens if bank 7 is switched out without canc…
... two banks of RAM, one contended, the other uncontended (0-3 ... , 3, 5 and 7 are contended and pages 0, 2, 4 ...128k Shadow Screen?When emulating the shadow screen in bank 7 should that bank be switched into address C000? If so, what happens if bank 7 is switched out without canc…
... , 3, 5 and 7 are contended and pages 0, 2, 4 ...InterruptsCan someone help with providing some info or a link about IM 2. I know I need to create a vector table and want to store this as high in memory as po…
... if the table is in contended memory, some Spectrum models will ...Interrupt timingsHow long does the ULA hold /INT low for on interrupt on each of the Spectrum models?
... ? I thought you had a TC2048. In any case the T ... -states for the TC2068, TC2048 and ZX Spectrum SE should ... 48k, 128k black box or TC2048!
The first non ...Interrupt timingsHow long does the ULA hold /INT low for on interrupt on each of the Spectrum models?
... tell you which cycles are contended:
[url="http://homepage.ntlworld ...Interrupt timingsHow long does the ULA hold /INT low for on interrupt on each of the Spectrum models?
... and it reckons the first contended cycle is 8479. Does the ...Interrupt timingsHow long does the ULA hold /INT low for on interrupt on each of the Spectrum models?
... the Timex machines have different contended memory areas? I need to ... needs to be in non-contended memory when it runs.
Interrupt timingsHow long does the ULA hold /INT low for on interrupt on each of the Spectrum models?
... the Timex machines have different contended memory areas? I need to ... needs to be in non-contended memory when it runs.
contended, by the looks of it ... know if the number of contended cycles varies at all.
Interrupt timingsHow long does the ULA hold /INT low for on interrupt on each of the Spectrum models?
... program a try on my TC2048 when I can get access ...Interrupt timingsHow long does the ULA hold /INT low for on interrupt on each of the Spectrum models?
... /> His results were,
"Contended at 14361
then ...
14363 to 14369 contended
14370 uncontended
14371 ... to 14377 contended
14378 uncontended
Interrupt timingsHow long does the ULA hold /INT low for on interrupt on each of the Spectrum models?
I get everything contended in the default range on my +2A. The other program gives 32.Interrupt timingsHow long does the ULA hold /INT low for on interrupt on each of the Spectrum models?
Is cycle 14489 contended on a +2A?Interrupt timingsHow long does the ULA hold /INT low for on interrupt on each of the Spectrum models?
... see if cycle 14489 is contended on a +2A then that ... emulator POV it's simply contended on cycle 14361, then 16x ...
