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Questions about the Speccy and it's emulationOut of interest, and to raise another interesting discussion, I have some questions about the Spectrum and it's emulation; 1) Is everything known ab…
... =0001628]Enduro Racer[/url]: undocumented instructions
[*][url=http://www.worldofspectrum ... ]Starion[/url]): precise timings (including contended memory)
[*][url=http://www ... -
Questions about the Speccy and it's emulationOut of interest, and to raise another interesting discussion, I have some questions about the Spectrum and it's emulation; 1) Is everything known ab…
... =0001628]Enduro Racer[/url]: undocumented instructions
[*][url=http://www.worldofspectrum ... ]Starion[/url]): precise timings (including contended memory)
[*][url=http://www ... -
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…
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Edit: which of the instructions gasman quoted are you claiming ... IR is not pointing to contended memory, which is easy to ... the +2A/+3 for those instructions than the 128K/+2. -
Flicker fixer for ZX 48KHas anyone the schematics for the flicker fixer: [URL]http://8bit.yarek.pl/computer/zx.48/[/URL] Micky
... cycle speed-up contended ports adress (OUT/IN instructions will work fast ... -
CPU speed measure possible?Is it possible to measure the CPU speed and shows the result on a LED display? Micky
... CPU cycles for various Z80 instructions, by constructing a loop which ... you know that fastest Z80 instructions take 4 cycles... :cool:< ... loop count and/or inserting instructions). If loop takes [clock ... t run the code in contended memory, and coding a loop ... -
CPU speed measure possible?Is it possible to measure the CPU speed and shows the result on a LED display? Micky
... of a number of MC instructions. Three ICs?
Also: Spectrum ... direct from Xtal, the other ('contended') one from ULA. We don ... -
DivIDEo - streaming video on the DivIDEThis has been a bit of a personal holy grail for years and years, so I'm very pleased to announce the release of DivIDEo, my streaming video system f…
... do with avoiding contended port reads during INI instructions - I forget exactly ... -
LDIR timings in contended RAM?The 48K Spectrum technical reference page ([URL="http://www.worldofspectrum.org/faq/reference/48kreference.htm"]here[/URL]) describes the detailed ti…
... Source (HL) is pointing to contended memory or not;
[*] ... Destiantion (DE) is pointing to contended memory or not;
[/ ... chains of LDI instructions (e.g. 32 LDI instructions in a push ... note is that contended memory is not actually contended until the ... -
LDIR timings in contended RAM?The 48K Spectrum technical reference page ([URL="http://www.worldofspectrum.org/faq/reference/48kreference.htm"]here[/URL]) describes the detailed ti…
... timings of contended RAM. It gives timings for Z80 instructions that are ... either residing in, or reading/writing, contended RAM ... -
Mr Do! ?Not exactly a new idea (at least twenty-seven years old now :-o), but how about a port of Mr Do! to the Spectrum? There was never an official one, ev…
... them up.
Z80 instructions that use just one M ... time, 8 T-states when contended. The RAM contention pattern on ... Spectrum is 128T (16*8 ) contended, 96T (24*4) uncontended. Therefore ... containing 40 (16+24) 4T instructions will take one ULA scan ... -
Mr Do! ?Not exactly a new idea (at least twenty-seven years old now :-o), but how about a port of Mr Do! to the Spectrum? There was never an official one, ev…
... them up.
Z80 instructions that use just one M ... time, 8 T-states when contended. The RAM contention pattern on ... Spectrum is 128T (16*8 ) contended, 96T (24*4) uncontended. Therefore ... containing 40 (16+24) 4T instructions will take one ULA scan ... -
Games in machine codeHi everyone, How do go about doing multiple shots like a machine gun, do you have to store every x and y position of each bullet? When you kill som…
... series can process several instructions per clock depending on ... of those instructions. FPU and SIMD instructions are processed ... parallel with normal register based instructions.
To ... disable those interrupts, avoid contended RAM and the full power ... -
What model next ?Hi All I already have two 48k rubber kyed 48k Spectrums and a Grey +2 What to get next. ZX Spectrum + ZX Spectrum 128 Toast Rack ZX Spectrum +3
... acceleration can be also implement (instructions IN/INI/INIR/OUT/OUTI ... are accelerated/fast/not contended (fast IN/OUT instructions)
- disable snow ... similar as on +2A (not contended). Snow effect in videoram is ... -
zx spectrum +2 troubleshootingHi There I am new here and I need some advise as to where to look for issues on my zx spectrum +2 it was working fine this morning .. then while pl…
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Thank you for your instructions in post 8. After following ... a fault in the non-contended ram bank. of my +2 ... to 24 were the non-contended ram chips and IC 24 ... -
Why doesn't my loop work?Can anyone help me understand why my loop doesn't work? Is it to do with how DEC HL affects the flags? [code] ; Read 32k bytes from port 191 as fa…
... of code that's in contended memory is the bit that ... buffer up with INI instructions. The actual INI instructions all execute from ... -
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…
... , screen RAM - which is contended and with a compatible design ... always will be contended. A faster CPU will ... as possible, nearly all instructions execute in one clock ... pipelined, and has conditional instructions to avoid pipeline flushes when ... -
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…
... a God
INSTRUCTIONS:
Insert the original ... game is loaded, select the instructions in the screen.
contended memory problem by sending two ... -
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 …
... /O operations are not contended (fast IN/OUT instructions)[/B]
- disable ... -
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 …
... /O operations are not contended (fast IN/OUT instructions)[/B]
- disable ... -
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 …
... /O operations are not contended (fast IN/OUT instructions)[/B]
- disable ... -
Time difference for jumps and calls?Just interested (and possibly trying to distract myself from the more pressing problems in my sprite routine) and willing to risk a potentially daft …
... the last few bytes of contended RAM. Naughty :P
instructions without prefix bytes (ie all ... the 'fast' instructions). So 5 bits out of ... -
Challenge Sprint 4x tape recorderHi, I noticed a [url="http://www.worldofspectrum.org/infoseekid.cgi?id=1000051"]Challenge Sprint[/url] on eBay, and checked out the WoS entry for it…
... , so it loads entirely into contended memory, which might cause a ... loading routine, as stack-related instructions and the instruction that stores ... , there's very few affected instructions in the loading loop.
28-character wide multicolour(ish) on 48k SpectrumLong-time lurker here... I've always been interested in rainbow effects on the 48k Spectrum, mainly from a perspective of "Just what [I]would [/I]ha…
... -byte instructions, which take 4 T-states longer (or 8 if contended ... ) than the other PUSH instructions. The knock-on ...28-character wide multicolour(ish) on 48k SpectrumLong-time lurker here... I've always been interested in rainbow effects on the 48k Spectrum, mainly from a perspective of "Just what [I]would [/I]ha…
... -byte instructions, which take 4 T-states longer (or 8 if contended ... ) than the other PUSH instructions. The knock-on ...28-character wide multicolour(ish) on 48k SpectrumLong-time lurker here... I've always been interested in rainbow effects on the 48k Spectrum, mainly from a perspective of "Just what [I]would [/I]ha…
... using LD a,(22528 ) --a contended instruction to keep everything in ... is a serie of NOP instructions and it would only break ... on machine state, but a contended instruction makes it on sync ... better to use a long contended instruction now and then to ...Brazilian TK90X and TK95SpecEmu provides explicit support for Brazilian TK90X. Other emulators provide indirect support (perhaps the "Spectrum 48K NTSC" option in Fuse?). Al…
... same (6 of 8 cycles contended), but it seems there is ... to be much more heavily contended. Obviously the IR pair must ... bit and test few other instructions to see what is going ...Some thoughs about fast scrolling on 128 modelPlease, consider this article as technically interesting concept not a proven algorithm. ONE The fastest scrollers use long sequence of PUSH inst…
... point of all those PUSH instructions. It's not doing a ... 11 cycles, or 16 when contended and done one after the ...Some thoughs about fast scrolling on 128 modelPlease, consider this article as technically interesting concept not a proven algorithm. ONE The fastest scrollers use long sequence of PUSH inst…
... place a number of PUSH instructions one after the other they ... in total
When contended, there is the 5T wait ... byte. So a run of contended PUSH instructions take 16T each.
contended time. Also saying the delay ...Some thoughs about fast scrolling on 128 modelPlease, consider this article as technically interesting concept not a proven algorithm. ONE The fastest scrollers use long sequence of PUSH inst…
... instruction location) is inside contended memory, it will be ... and, according to the contended memory table, trying to ... example, HL also references a contended memory address (26000), which ... does. Even so, many instructions are affected by contention from ...Some thoughs about fast scrolling on 128 modelPlease, consider this article as technically interesting concept not a proven algorithm. ONE The fastest scrollers use long sequence of PUSH inst…
... In fact, all following PUSH instructions will have the same 5T ... further. The memory is only contended during the screen drawing, which ... drawing time. If we get contended, on average, for 7.5 ... on the exact sequence of instructions you are using. Therefore this ...
