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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…
... pattern. You simply cannot write contended bytes any faster.
instructions between PUSHes without making it ... -
Contended Memory woes...Hello All, An iccle problem I have and was hoping one of you fine WoSers could bail me out again... :) I've noticed that my emulator is running sli…
... this one. Details on which instructions require IR contention can be ... the relationship between all the instructions that it needs to be ... address and use the same contended memory rules as I did ... (I appreciate it's never contended)?
How do you ... -
Contended Memory woes...Hello All, An iccle problem I have and was hoping one of you fine WoSers could bail me out again... :) I've noticed that my emulator is running sli…
... the relationship between all the instructions that it needs to be ... address and use the same contended memory rules as I did ... contended)?
[/quote]
No. It's just those specific instructions ... -
Contended Memory woes...Hello All, An iccle problem I have and was hoping one of you fine WoSers could bail me out again... :) I've noticed that my emulator is running sli…
[QUOTE=Korinel;707676]I implemented contended memory simplistically but I'm ... emulation. About half of z80 instructions are not perfect emulated with ... -
30-column 8x2 multicolor (even in 48K)I don't recall any 8x2 multicolor routine for 30 columns that would work on all Spectrum models (including the Spectrum 48K), so I decided to write i…
... columns running multicolor 8x1 from contended memory:
[CODE] ; 15905T ... also tried other combinations of instructions but it didn't really ... -
Scrolling by 2 pixelsWhat is the fastest way of scrolling a Spectrum screen line by 2 pixels left or right? When thinking about it I've come to this simple solution: [C…
... . If the jr or jp instructions' condition is false, is the ... , getting your code out of contended memory is the *first* thing ... -
How much does Bifrost improve graphics (test 192x192 graphics)Inspired by the BIFROST library I made several experiments with 8x1 graphics at 192x192 resolution. The results are now overwhelming but under certai…
... 're only doing 16 PUSH instructions per line.[/QUOTE]
contended and 96T non-contended.
It ... obviously better to use non-contended time to execute as many ... will give us 105T of contended time left.
... -
Experimenting with turboloadersHello, My first post, having lurked here for a while. I'm a lifelong computer nerd, Spectrum fan since childhood in the eighties, and have recently…
... possible, but "drive" it from instructions still in the REM statement ... there because it's in contended memory, but you can put ... -
Experimenting with turboloadersHello, My first post, having lurked here for a while. I'm a lifelong computer nerd, Spectrum fan since childhood in the eighties, and have recently…
... T-states' worth of OUT instructions.
Contention is also ... ; if the AY port is contended, timings become harder to calculate ... -
FUSE serial communication sample anyone?Hi, in [URL="http://manpages.ubuntu.com/manpages/precise/man1/fuse.1.html"]FUSE man pages[/URL] one finds switches for serial comms. By using --inte…
... .36 tstates / symbol, and some instructions can take quite a large ... , especially when executing and accessing contended memory. Nowadays, I expect a ... -
FUSE serial communication sample anyone?Hi, in [URL="http://manpages.ubuntu.com/manpages/precise/man1/fuse.1.html"]FUSE man pages[/URL] one finds switches for serial comms. By using --inte…
... .36 tstates / symbol, and some instructions can take quite a large ... , especially when executing and accessing contended memory. Nowadays, I expect a ... wait states - perhaps two nop instructions per bit. So no processor ... -
Fuse bug? Strange T state countingI was testing delay routine presented [URL="http://www.worldofspectrum.org/forums/showthread.php?p=214851"]here[/URL]. I'm reproducing its listing: …
... ]Is the stack located in contended ram?[/QUOTE]
This ... anymore. Putting stack in the contended RAM, RET and RET NC ... sure these instructions are delayed by return address stored at contended stack ... -
Better arrangement for video memory?While doing some documentation work for the ZX-Uno project, I compared the advantages of the weird layout of the ZX Spectrum against a linear layout.…
... screen address ( I think 6 instructions shorter )but you still need ... fact, if you're in contended time and you only used ... -
Ensure my interrupt handler begins at the same T-stateHi! Is there a way to ensure that an IM 2 interrupt handler starts always at the same T-state (related to the moment the ULA triggers the INT line, w…
... think): making memory accesses to contended memory when the ULA is ... can be used to delay instructions thus "align" them with contention ... -
Code structureHi all, I'd be interested in opinions on the neatest way to do this. I've got a print string routine in which 0-31 are reserved for control codes, …
... at beginning of program in contended memory, so the entire program ... . Did you follow the compilation instructions provided in the documentation?
Best Z80 Assembler for PC?There's probably already a thread for this so if somebody could please point me at it I'd appreciate it. If there isn't then please respond here wit…
... with measuring T-states in contended memory if the wait per ... it but cycle stretching of instructions will vary from architecture to ... a different mechanism for all instructions whereas the spectrum only does ...128K memory bank selection to avoid contention issuesI'm currently developing a game and I'm trying to get my head around the memory contention issues of the various 128K/+2/+2A/+3 spectrum models in or…
... T-states for INC BC instructions equates to around 70,500 ... 10% more instructions in the uncontended bank than the contended one in ...Troubleshooting RAM IC's on Spectrum +2 Grey?Got myself a grey +2 but at startup it shows something very similar to this: [img]https://preview.ibb.co/mmai5F/2_Ram_Fault.png[/img] I also su…
... /#Comment_481806
Following the instructions of mcleod_ideafix this is what ... chips must be in the contended memory.
Without proper diagnose ...Need help from people with a +2A/+3Started a topic [url="https://www.worldofspectrum.org/forums/discussion/55141/need-help-from-people-with-a-2a-3"]here[/url] to get a broader reach, b…
... a contended port and padding instructions that are not dependent on contended memory ... and an instruction that accesses contended memory works:
Port ...Need help from people with a +2A/+3Started a topic [url="https://www.worldofspectrum.org/forums/discussion/55141/need-help-from-people-with-a-2a-3"]here[/url] to get a broader reach, b…
... a contended port and padding instructions that are not dependent on contended memory ...Need help from people with a +2A/+3Started a topic [url="https://www.worldofspectrum.org/forums/discussion/55141/need-help-from-people-with-a-2a-3"]here[/url] to get a broader reach, b…
... , as well as some text instructions. Get it from the [url ... memory to use all the contended pages (4,5,6,7 ...Troubleshooting my +2To put this in context: a while back (i.e. late last year and earlier this year) I was looking to put together a compilation of modern Spectrum games…
... either the screen RAM (all contended banks), or all memory above ... (upper RAM) including any non-contended banks.
Run a memory ... previous models where the usual instructions, as I remember, were "set ...The I register pointing to $40–$7f causes ULA snow and a crash. Or does it?I have heard it from numerous sources, including a few members of this forum, that 128K/+2 machines crash if the I register points to a range of $40–…
... .e. the CPU executing unintended instructions?
If my assumption ... . If it’s a non-contended bank, then the same rule ... applies; if it’s a contended bank, then the snow effect ... EDITOR code). Bank 7 is contended, so the snow effect kicks ...Need help from people with a +2A/+3Started a topic [url="https://www.worldofspectrum.org/forums/discussion/55141/need-help-from-people-with-a-2a-3"]here[/url] to get a broader reach, b…
... any instructions, the pattern of original models is simply 6 contended and ... +2A/+3 models is 7 contended and 1 uncontended cycle, with ... glitch of 1 contended cycle before that).
New Version of MAME Emulator out with enhancements on Spectrum-EmulationNew Version 0.216 of MAME Emulator out with enhancements on Spectrum Emulation: [url="https://www.mamedev.org/?p=476"]https://mamedev.org/?p=476[/…
... /> -cpu/z80: Improved timing within instructions. (#9449) [holub]
* This allows ... ]
-Spectrum +2/+3 contended memory is different to Spectrum ...How to use SPECTRUM emulator for playstationAnybody got an idea how to add roms to the SPECTRUM emulator for the playstation? I burn the .exe on the cd and it works fine with built-in game, but…
... been able to find ANY instructions regarding to this emulator... Thanks ...Re PSI Chess and others...After reading about Ed's 36 hour decoding mission on PSI Chess, I feel that the one thing we need is a totally comprehensive instructions section. I …
... need is a totally comprehensive instructions section. I know that there ... with nothing but htmled original instructions and nothing more, like they ...How do i learn to programAll the years i had a computer the only one i could program was the Texas Instruments Ti99/4a and when using extended basic with its so simple sprite…
... with its so simple sprite instructions i did good versions of ...Shadow of the UnicornI've written a program to run Shadow of the Unicorn on a +2A/+3. Is there anywhere it can be put to be available to anyone wanting to play the game?…
... quite perfected yet. I need instructions to set the flags register ... /> Again, if you know those instructions let me know here.
