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Speccy 128 Shadow screen.How much is the shadow screen used in 128k commercial software? I ask because I am looking at putting 128k of memory in the 48k setup I have been bu…
... the +2A, with different banks contended looks like a pain in ... , but only the other two contended ones. Great.[/QUOTE]
Gigascreen - programming guideDoes anyone know of a programming guide for the 128K gigascreen screen mode, specifically a persistence colours table, some code (pref. C level or BA…
... between them every frame (via HALT, or an interrupt routine, or ...Gigascreen - programming guideDoes anyone know of a programming guide for the 128K gigascreen screen mode, specifically a persistence colours table, some code (pref. C level or BA…
... 1 in high memory
HALT ;Wait for 50Hz interrupt
HALT ;Wait for 50Hz interrupt
Sprites masterclassHi All, You guys are probably tired of explaining sprites but I'd like to clarify a few things if possible. I've sorted the vertical aspect of scro…
... ,demo_bank1
call demoa2
halt
ld hl,demo_bank2
call demoa2
halt
jr demoa1
;
Damaged Tapes?I have a bunch of spectrum tapes that I'd like to convert to emulator formats. I tried copying one or two, first as MP3s and then using a couple of d…
... tapes that ground to a halt when I tried to play ...Contention: LDI vs LD (ss), rAccording c.s.s. FAQ: instruction LD (ss),r breakdowns as pc:4,[b]ss:3[/b] and LDI as pc:4,pc+1:4,hl:3,[b]de:3,de:1 x 2[/b] can anyone explain why …
... ] means that DE pointing to contended memory introduces 3 delays ?[/QUOTE ...Contention: LDI vs LD (ss), rAccording c.s.s. FAQ: instruction LD (ss),r breakdowns as pc:4,[b]ss:3[/b] and LDI as pc:4,pc+1:4,hl:3,[b]de:3,de:1 x 2[/b] can anyone explain why …
... ]
if we forget contended memory, both routines should move ...Contention: LDI vs LD (ss), rAccording c.s.s. FAQ: instruction LD (ss),r breakdowns as pc:4,[b]ss:3[/b] and LDI as pc:4,pc+1:4,hl:3,[b]de:3,de:1 x 2[/b] can anyone explain why …
... sequence for both fragments spanning contended cycles to illustrate that. Try ... memory op tstates colliding with contended cycles. Try starting them at ...Speccy 128 Shadow screen.How much is the shadow screen used in 128k commercial software? I ask because I am looking at putting 128k of memory in the 48k setup I have been bu…
... provides an A7 for the contended 64K, so its not entirely ...Calculating the address of a pixel?Hi Folks, Is there an easy/quick way of calculating the memory address of a pixel? So for example, if I wanted to "plot" pixel at screen coordinate…
... code will always sit in contended memory. I?m not sure ...Calculating the address of a pixel?Hi Folks, Is there an easy/quick way of calculating the memory address of a pixel? So for example, if I wanted to "plot" pixel at screen coordinate…
... scheme - afaik all memory was contended, anytime (so every memory access ...That minigame at the start of EurekaDoes anyone else think that minigame thing you have to play before you get into Eureka is really annoying? I've had it for years but I haven't played…
... lot! This POKE removes the HALT instruction and makes the game ...Official CSSCGC 2011 Competition ThreadHello fellas. The site is up and running. We are already accepting submissions. [url]http://www.mojontwins.com/csscgc2011/[/url] Rules, info, and e…
... : We get advantage of the contended memory problem by sending two ...Any folks with a mechanical mind on here...?I need some advice about my motor. I drive a 1.8 VVT-i Toyota Avensis T4, 53 plate. It's one of them engines that over-revs when you start it to wa…
... the car came to a halt...[/QUOTE]
That's the ...What web browser?Hi Guys What browser are you using on your laptop/pc? Is it still a case of either I.E or Firefox or have some people moved on to Google Chrome or so…
IE, it's as good as FireFox without being resource greedy and eventually coming to a halt.What web browser?Hi Guys What browser are you using on your laptop/pc? Is it still a case of either I.E or Firefox or have some people moved on to Google Chrome or so…
I'm currently getting used to Chrome (previously an avid FireFox user), it's as good as Ff without being resource greedy and eventually coming to a halt like IE.What web browser?Hi Guys What browser are you using on your laptop/pc? Is it still a case of either I.E or Firefox or have some people moved on to Google Chrome or so…
... and eventually coming to a halt.[/QUOTE]
people say that ...Recent talk of developing new SpectrumsHi all, I can see from a few threads on here that some Wossers like Vasil and Aien 8 are interested in developing more powerful Spectrums or improvi…
... bus? failed (0xff)
Contended memory? passed
High port ... LDIR? failed (0x01)
Contended IN? failed (0xfe)
... LDIR? failed (0x05)
Contended IN? failed (0x03)
... bus? failed (0x00)
Contended memory? failed (0x02)
...contended memory...so memory contention on the toastrack and the grey +2 is in the wrong place compared to the documentation, yet the +2a/b and +3 it is in the correct …
... have odd banks contended and even banks non contended, and +2A/B ... banks 0-3 non contended and 4-7 contended. Is this right ...Is ZX80 really "Z80 only"?The Spectrum has ULA to generate video display. Does the ZX 80 have any kind of processing chips apart from Z80? How is the video display generated o…
... instructions - until there's a HALT at the end of the ...yeah - unix for zx spectrumI started a new hobby project. An operating system for ZX Spectrum. A unix clone. Talked to my friend about it and he asked me what if after I'm done…
... only grinds things to a halt; I can only see these ...Push/Pop data copyingWe all know that stack pointer cheese and push/pop is faster to move data than LDIR - which in turn is slower than unrolled LDI's anyway. I rewrote …
... want to synchronise with the contended memory cycles, so as not ...
