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ROM emulation in softwareHi, first of all -- I only have shallow / uni knowledge of hardware, electronics, and physics. So forgive me for asking things that are out of that …
... a +2 (grey), (because the +2A, +2B and +3 already have ... at the Z80 memory cycle timing. Using the Z80 CPU's ... fair, doing this on a +2A, +2B and +3 would be ... -
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…
... first screen byte on the +2A/+3 is displayed at T ... found many of the typical timing numbers given to be incorrect ... I/O contention on the +2A/+3 in the first place). -
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…
... " but I've put the +2A away now for a bit ... tapes so you were lucky timing-wise! ;)
I'll ... -
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…
... " but I've put the +2A away now for a bit ... tapes so you were lucky timing-wise! ;)
I'll ... -
Most accurate display on emulatorWhich Windows emulator has the most accurate display. I am making a game and one of the tiles is not showing correctly on an real spectrum +2 machin…
... or +2A problem, for instance?) and that accurate colour timing is enabled ... -
Most accurate display on emulatorWhich Windows emulator has the most accurate display. I am making a game and one of the tiles is not showing correctly on an real spectrum +2 machin…
... or +2A problem, for instance?) and that accurate colour timing is enabled ... he could be using a +2a). -
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…
... issue 1 board and says +2A on the case, and the ... 48k machines. Whereas the (black) +2A, +2B and +3 machines use ... made for Weiv, doing his timing tests:
https://www.youtube ... cost savings on every +2, +2A, +3, CPC464, CPC664, CPC6128, and ... -
Detecting +3 / +2AWhat's a simple but reliable way to detect if code is running on a +2A/+3? My first though was to try switching to ROM2 and then checking for the …
... , tweaked the timing for 128K/+2, then found the +2A/+3 performance ... every 8. But on a +2A it's restricted to only ... the slight variation, but the +2A would suffer badly in the ... trick of tripping up a +2A..?
[code]
Detecting +3 / +2AWhat's a simple but reliable way to detect if code is running on a +2A/+3? My first though was to try switching to ROM2 and then checking for the …
... 's a 128K/+2 or +2A/+3.
Unfortunately, it ... view or change the colour timing. Once you start playing the ...Fast Binary to Text DisplayI've done this thing that takes some memory contents and converts it to a Binary version of 0's and 1's on screen. However, I've no idea what to use …
... CRT TV and hooked my +2A to it. Most small text ... />
[quote="Arkannoyed;929933"]Few timing issues I think!! :)) [/quote]
Witchcraft: Nirvana, Bifröst and such[url="http://www.rgcd.co.uk/2011/10/buzzsaw-zx-spectrum.html"]"When considering this next to nearly every other ZX Spectrum game though, Buzzsaw is l…
Getting multicolour timing right takes more care ... system one varies in its timing. If you must drop ... routine.
The timing varies between hardware models, yes ... mode still has 128K timing as it's still ... a bit faster, and +2A/+3 machines have the same ...Gandalf [z88dk][Nirvana Plus][128Kb]Gandalf 1.00 [url="https://drive.google.com/open?id=1T9HK0_isoMrfogSIJVhPGehjVIdFus4c"]Download Ver 1.00[/url] Long after the destruction of t…
... ’t work on the +3/+2A.
[/quote]
We ... +2a/+3 version, eventually it will be released, but have some timing ...Any reason to prefer the 48k version of a game over 128k?Title says all... are there any games for which it makes sense to play the 48k version if there is also a 128k version? To my understanding, the 128k…
... only deterrent may be the timing difference between the three models ... : 48K, 128K/+2, and +2A/+3. If the programmer took ...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–…
I don't think early/late timing has any effect on +2A/+3, does it? Anyhoo it does the same thing under both variants.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–…
... think early/late timing has any effect on +2A/+3, does it ... -128-black-2-and-grey-2a-2b-3"]in a strange ...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–…
... ’s right there in my +2A manual, as well (well, duh ... there.[/quote]
Yep, the +2A manual is basically the same ... a frame overrun caused by timing differences and different bank contentions ...Making sound using the BEEPER in AssemblyI had a look at the the documentation but it doesn't make sense to me. To make music just the beeper all I have to do is send ones and zeros to one o…
... +2, but is uncontended on +2A and up, as well as ... port address doesn't affect timing, but I never actually verified ...Making sound using the BEEPER in AssemblyI had a look at the the documentation but it doesn't make sense to me. To make music just the beeper all I have to do is send ones and zeros to one o…
... on both the 128K and +2A, and 1456.2 Hz on ... on a real 128K and +2A at the earliest convenience (I ... doesn’t seem to affect timing, but the test tells us ...New test for finding missing +2A/+3 ULA timing detailsHello, having added the +2A/+3 emulation recently, I want to make sure I got the ULA timing 100% right. We know when the contention pattern starts, …
... , add +1 for late)
+2A, +3 14362 14137 14140 14363 ... results in so called late timing, even though one could argue ... cycle 2 (so called early timing, which is in fact the ...Fuse/SPIN vs Spectaculator border timingsHello, I'm trying to figure out at which moments the 48K ULA samples the current border color into its internal latch. To do that I wrote a small …
... , we have nailed the sampling timing of +2A/+3 machines. At that ... we discovered the difference between +2A and +3 screen paging pattern ...48k Spec with composite video mod, screen adjustment possible?I've had a 48k Speccy with a composite video mod for a few years now, and although it works perfectly otherwise, the screen isn't centered correctly …
... a 9V PSU) or a +2A / +2B black (uses a ... than anything else. The timing is fixed inside the ULA ... uses for its master clock timing.
Maybe ... would have the same timing. The +2A/+2B will be very ... similar in terms of the signal timing ...If Sinclair computers had not been sold...I was just having a random thought. If Sinclair Computers (or the rights to them, not sure how it 'worked' back then) had not been sold to Amstrad…
... 128K machine.
[*]There are timing delays, so that when a ... the +3 and then the +2A / +2B. The custom gate array ...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[/…
... - 9449: cpu/z80: Improved timing of M cycles; spectrum.cpp ... br /> -cpu/z80: Improved timing within instructions. (#9449) [holub ... --------------------------------------------------
-spectrum128/2A/3: Improved contention timing emulation (#9670) [holub ...How to disable the "scroll?" message?Hello. I'm a beginner Z80 assembly programmer and I decided to make a ZX Spectrum game to practice my skills and gain some more experience. I curr…
... fast the code runs
TIMING EQU 0
; this ...
mainloop:
IF TIMING
ld a, (bdr_colour)
2A, #AA
border_botL db #55 ... , #00
border_botR db #AA, #2A, #EA, #0A, #FA, #02, #FE ...How to disable the "scroll?" message?Hello. I'm a beginner Z80 assembly programmer and I decided to make a ZX Spectrum game to practice my skills and gain some more experience. I curr…
... fast the code runs
TIMING EQU 1
; this ...
mainloop:
IF TIMING
ld a, (bdr_colour)
2A, #AA
border_botL db #55 ... , #00
border_botR db #AA, #2A, #EA, #0A, #FA, #02, #FE ...How to disable the "scroll?" message?Hello. I'm a beginner Z80 assembly programmer and I decided to make a ZX Spectrum game to practice my skills and gain some more experience. I curr…
... fast the code runs
TIMING EQU 0
; this points ... , #FE, #02, #FA, #0A, #EA, #2A, #AA
border_botL db #55 ... , #00
border_botR db #AA, #2A, #EA, #0A, #FA, #02, #FE ... /> ball_vy db 1
IF TIMING
last_frame db 0
How to disable the "scroll?" message?Hello. I'm a beginner Z80 assembly programmer and I decided to make a ZX Spectrum game to practice my skills and gain some more experience. I curr…
... fast the code runs
TIMING EQU 0
; this points ... , #FE, #02, #FA, #0A, #EA, #2A, #AA
border_botL db #55 ... , #00
border_botR db #AA, #2A, #EA, #0A, #FA, #02, #FE ... /> ball_vy db 1
IF TIMING
last_frame db 0
Emulator compatibility with real SpectrumHi emulator programmers... Having spotted for the last 6 months that my iPAQ is still missing a Spectrum emulator I started typing last tuesday - an…
... put more effort into the timing of the emulated computer (I ...Keys in 48k mode for SpecEmu 1.2?Hello all, Does anyone know how to get the " symbol to appear when in 48k mode on Spec Emu 1.2? As you can imagine, it's pretty essential to be able…
... of Marauder. I thought the +2A was the only one that ...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?…
... of the Unicorn on a +2A/+3. Is there anywhere it ...
