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Paging MemoryAny idea why this short piece of code doesnt work, just crashes. I am just messing with paging memory in and out (not achived this yet) and reading t…
... 32768-49151, this part of memory can not be paged in ... , not unless you care about memory contention) - either of those pages can ... -
What did Spectrum BASIC lack (and was BBC BASIC so good?)Over the years, I've read in various multi-format magazines, that BBC BASIC was probably the best BASIC available on an 8-bit machine. I've never use…
... fast CPU and lack of memory contention, but mostly it's down ... -
Compatible SpectrumsFollowing some recent coding exploits I've been thinking about compatibility of various models of ZX Spectrum. Yes, it's a common question on the for…
... at all... due to the memory contention issues. The +2a/+3 ... also the issue of different contention timings to the "original" ... hardware contention, surely.
Of course, if my memory ... clock for reading the screen memory and that is probably ... -
Oxford Speccy meetup, October 20th[b]Update:[/b] Date and venue decided - The Gloucester Arms, from 2pm, 20 October 2007. Full details: [url]http://matt.west.co.tt/spectrum/oxford-spe…
... about Life, the Universe, and Memory Contention on the Harlequin (aka Bomb ... -
Pentagon floating bus timingI wanted to take a little break from working on the ZXDS UI yesterday, so I added support for Pentagon timing instead, so I can finally enjoy the lik…
... fetches the bytes without any memory contention would be nice, too.[/QUOTE ... it uses dual-ported video memory ? in which case, you wouldn ... -
Full throttle CPUHello, I was just wondering: do you experts know if any of the 48K games pushes the Z80 CPU to 100%? I mean, every CPU cycle is used? If so, what's t…
... is just as quick (modulo memory contention) as any other write on ... , OUTing to say the 128K memory port could cause 32Kb of ... real memory to be copied around (even ... -
DivIDE+ and 128K HeatsinkI got my DivIDE+ yesterday and i tried it on a 48K+ at first, it worked marvelously on it, no problems at all. Today i desided to try it on my 128 H…
... interrupt vector table in contended memory, which has unpredictable results on ... Spectrum clones don't have memory contention, so the programmers weren't ... -
First multiload gameWhile writing the review of A View to a Kill for the Speccy review book, I commented that it was one of the first multi-load games for the Speccy. D…
... graphics.
Damn you memory contention delays! Damn you all to ... -
First multiload gameWhile writing the review of A View to a Kill for the Speccy review book, I commented that it was one of the first multi-load games for the Speccy. D…
... graphics.
Damn you memory contention delays! Damn you all to ... having that stored twice in memory and just change the video ... -
Fast screen writesI wondered what the faster than LDIR methods of writing to the screen were.
... repeatedly get clobbered by the memory contention in the screen ram which ... -
Fast screen writesI wondered what the faster than LDIR methods of writing to the screen were.
... repeatedly get clobbered by the memory contention in the screen ram which ... 16K will be clobbered by contention repeatedly, if it's repeatedly ... -
Which computer is most similar to Zx Spectrum?I have wondered recently wihch other 8-bit computer is most of all similar to Zx Spectrum. I mean similar graphics, similar gameplay, similar program…
... 8x8.
3. The video memory is in a separate address ... by the CPU; this avoids memory contention but stops you from directly ... fast writes to the screen memory for things like smooth scrolling ... -
what were the things the Speccy architecture was good for?I don't know a hell of a lot about all the different computers hardware and I wanted to know if the way the Spectrum was built lent itself to certain…
... , and this is exacerbated by memory contention between it and the video ... got to spare and the memory to store the graphics in ... -
what were the things the Speccy architecture was good for?I don't know a hell of a lot about all the different computers hardware and I wanted to know if the way the Spectrum was built lent itself to certain…
... faster, it loses more to memory contention so that tends to even ... -
what were the things the Speccy architecture was good for?I don't know a hell of a lot about all the different computers hardware and I wanted to know if the way the Spectrum was built lent itself to certain…
If memory serves me right, the ... colours (as it has more memory to play with). I ... if only for the extra memory, but also for the CMOS ... be faster, having no screen memory contention combined with the 6502's ... more efficient writing to memory and use of index ... -
RGB on speccy ?hi, just a question : are you aware of scene demo trying emulate rgb ? i was a bit ill last few days so laying in bad i come with a (stupid ?) idea.…
... them out again into screen memory) can only manage 16 characters ... if it wasn't for memory contention. -
RGB on speccy ?hi, just a question : are you aware of scene demo trying emulate rgb ? i was a bit ill last few days so laying in bad i come with a (stupid ?) idea.…
... if it wasn't for memory contention.[/quote]
Don't you ... -
RGB on speccy ?hi, just a question : are you aware of scene demo trying emulate rgb ? i was a bit ill last few days so laying in bad i come with a (stupid ?) idea.…
... , but on a real Spectrum, memory contention eats up too much time ... -
ZX Spectrum (16K) sound/beepHi all, I think I'm in right place now, I've tried to find an answer how to generate two channel sound using ZX Spectrum 16K. Only think I've found …
... RAM will get hit by memory contention which will tend to distort ... -
ZX Spectrum (16K) sound/beepHi all, I think I'm in right place now, I've tried to find an answer how to generate two channel sound using ZX Spectrum 16K. Only think I've found …
... an example of how bad contention is, try using the ... area. With correct contended memory emulation it sounds horrible.[/QUOTE ... sounds awful in Spin with contention turned on though; music ... the timing loops to take memory contention into account. That's ... -
ZX Spectrum (16K) sound/beepHi all, I think I'm in right place now, I've tried to find an answer how to generate two channel sound using ZX Spectrum 16K. Only think I've found …
... sounds awful in Spin with contention turned on though; music for ... the timing loops to take memory contention into account. That's probably ... -
Hi-colour gamesDoes anyone remember some of the games that used something called Ho-colour? Like the options page on the Agent X games, and a few others. If memory …
... the speccy's attribute display memory just ahead of the "TV ... I know, pentagon has no memory contention (well, I might be totally ... -
25 years with the SpectrumTo paraphrase JFK, ask not what your Spectrum can do for you, but what you can do for your Spectrum. Well I've done quite a bit since I joined the sc…
... 't need to know about memory contention, accurate Z80 emulation, proposed changes ... -
What was the best 16K Spectrum GameOK, I'm putting up a poll, but its not really about the poll, but a chance to focus on the 16K gems. (The poll, taking those with the best WoS rating…
... -adventures tend to be quite memory intensive and there's just ... mode 2 interrupts properly and memory contention slows code down by around ... -
Detecting Spectrum modelsIs there any sure-fire way a program can detect the model of machine it's running on (48K, +, 128, +2, +2A, +3, clones) even when running in the 48K …
... clock cycles between interrupts. The memory contention timings are also different between ... -
Detecting Spectrum modelsIs there any sure-fire way a program can detect the model of machine it's running on (48K, +, 128, +2, +2A, +3, clones) even when running in the 48K …
... clock cycles between interrupts. The memory contention timings are also different between ... [1] lets you know your contention pattern[2].
[1 ... -
Detecting Spectrum modelsIs there any sure-fire way a program can detect the model of machine it's running on (48K, +, 128, +2, +2A, +3, clones) even when running in the 48K …
... to the screen memory - then you run into the memory contention issues, which ... -
Brand new River Raid remake?one of my friend is trying to make a riverraid remake on flash just to have fun, I checked zx spectrum port of river raid. it is bad, really bad, jer…
... time; remember to allow for memory contention and, if in doubt, use ... -
Brand new River Raid remake?one of my friend is trying to make a riverraid remake on flash just to have fun, I checked zx spectrum port of river raid. it is bad, really bad, jer…
... have a little less video memory contention than previous 128K machines, so ...
