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Definitive list of games incompatible with +2A/+3 and of compatible versions (if any)I am trying to compile the definitive list of games which are incompatible with the +2A and the +3 and of their compatible versions, if they are pres…
... might know, this is partly floating bus-related, but the actual issue ... mechanism in the form of floating bus reads. This improves the situation ... models up to and including +2 but is not a complete ... -
Spectrum 128k+2 on tvHi, I want to buy a 128+2, did have one years ago, can i let it work on a flat tv screen, if so what do i need to do this.
Grey +2 is much more compatible with games that need the floating bus (Sidewize ... -
That's my last ZX Spectrum projectHi4all, I want to show my last project: https://www.youtube.com/watch?v=za_p9Mbfu0Y I wish to release a v1.0 very soon! Best regards
... precision in times walks by +/- 2 or 3 microseconds per frame ... that I solved in PI 2/3 leaving the CPU-0 ... emulation. At the moment, nuclei 2 and 3 leave them sleeping ... of the Z80, contained memory, floating bus, accurately drawn both the edge ... -
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…
... to distinguish between 128K/+2 from +2a/+2b/+3 ... Spectrums do not have the floating bus ("port #FF"). Therefore, ... you are on 128K/+2. This is an example ... this computer has the floating bus (assumes that screen is ... , #15, #13, #17 ; 128K/+2 (i want to have my ... -
Interrupts, 16k Spectrums and snowI'm writing something for the 16k Spectrum and I want to use interrupts. The avilable documentation doesn't seem clear enough for me to figure out ho…
... /> I decided to keep the floating bus sync (and I do it ... _must_ hit at 50hz
2) Floating bus to sync start of drawing ... -
Interrupts, 16k Spectrums and snowI'm writing something for the 16k Spectrum and I want to use interrupts. The avilable documentation doesn't seem clear enough for me to figure out ho…
... /> I decided to keep the floating bus sync (and I do it ... _must_ hit at 50hz
2) Floating bus to sync start of drawing ... -
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…
... Iraq[/i] that uses the floating bus for syncing on all Spectrum ... Yankee in Iraq 1.0.2 Beta[/i][/url]
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…
... recent floating bus test 2, there were 2 version in the folder. Version 2:-
Version 2.1 at first load up ...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…
... .[/quote]
Right. Using the floating bus as a way of syncing ... , neither the quirky +2A/+3 bus behavior, nor the “standard” 48K ... /128K/+2 behavior should lend itself to ...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…
... with minimal bounce of 1-2 pixels vertically regardless if I ... value will appear on the floating bus at which T state, but ...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…
... result of the test v.2.1 is that yellow stripes ... from screen memory changes the floating bus value.[/quote]
Like [i ...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…
... influence of memory operations to floating bus probably concerns "slow" memory pages ... for +2A/+3 (for 128/+2 they are 1,3,5 ...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…
... influence of memory operations to floating bus probably concerns "slow" memory pages ... for +2A/+3 (for 128/+2 they are 1,3,5 ...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…
... quite exact emulation of the floating bus (but also related to the ... stripes on the screen.
2. Enable cycle-accurate display update ...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…
... quite exact emulation of the floating bus (but also related to the ... stripes on the screen.
2. Enable cycle-accurate display update ... ; Display to “Display 1 in 2 frames” or “Display 1 in ...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…
... ] Spectrums. :D
The floating bus on the +2A/+3 behaves ... differently from the 48K/128K/+2. The key differences are listed ... , 9, 13 . . . 4093)
2. The bus always returns $FF if bit ... case on the 48K/128K/+2.
That’s the ...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…
... of the display file), the bus retains the value that was ... case on the 48K/128K/+2.
[/quote]
5. ... operation code fetching) affects on floating bus too. So, (the value ... of floating bus ports.
6. The main pattern of the floating bus reading ...New Game: A Yankee in Iraq (2017). A shoot-em-up.Last year, I [url="https://www.worldofspectrum.org/forums/discussion/53207/new-game-2016-revival-a-yankee-in-iraq-1992"]resurrected my old shoot-em-u…
[b]Version 1.0.2 is out![/b]
... optimizations
—Now uses the floating bus for synchronization. [b]The first ...Should I sell my +2A?The +2A was the last Spectrum I bought and to be honest I never gave it much use :| Unlike the 48k, 48+ and +2 grey on which I have played many ga…
... -a-2a-3"]solved the floating bus mystery[/url] on the +2A ... Dizzy[/i] on a 128K/+2 and a +2A and compare ...Modern Spectrum Games Advent CalendarSo... it is done. The main reason for my return from the shadows earlier this year was because I knew the greatest Christmas present I ever had was c…
... for the toast rack and +2, side B was for the ... problems with it on the +2. The author may tell me ... 48k, 128 and +2, since it uses the floating bus to synchronize) is ...Send in the ClonesPlease name all the Spectrum clones out there ( I would say I need it back on my desk in 5 minutes , but I will be a bit more generous in this case!…
... in simple terms what a 'floating bus' is? I read the Sinclair ... , when we use the term “floating bus” we refer to the data ... other changes, they “fixed” the floating bus problem, thus rendering the games ... v1.0.2) became the first game to use the floating bus on ...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–…
... says crashes a real 128k/+2 all the time.[/quote]
ld i,a
im 2
ei
ret
floating bus sync, but that’s irrelevant ...Which to buy? +2/+2a/+3?Sorry - I did a quick bit of lunchtime googling, it sounds like the grey +2 is the best machine, as it has the board without the reduced chipset. I …
... to fix the [s]floating point[/s] "floating bus" issue, but I do ... do this to my black +2 at some point, its having ...GLUF[url="http://www.retrosouls.net/"]retrosouls.net/[/url] https://youtu.be/P4F4XVbnNDY
... "]Tested the game on the +2 in Fuse, SpecEmu, RVM, and ... /> Don’t see how the +2 would cause issues, while the ... 't know about "#ff floating bus" on grey +2. That how my loader ...A Yankee in IraqI'm testing the game on the zx next and it currently hangs right after the game starts no matter what timing regimen and contention pattern is chosen…
... .com/zx/25_years_in_the_making.html"]v1.2.0[/url] I disabled IF1 ... Fuse and it ran successfully (floating bus port issue with IF1 active ...A Yankee in IraqI'm testing the game on the zx next and it currently hangs right after the game starts no matter what timing regimen and contention pattern is chosen…
... />
2. You’re right, the game uses the floating bus for frame ... port to read (and the bus polling loop itself).
... />
ld hl,v_sync+2
ld (hl),$2b ;code ... br /> [/code]
The floating bus loop itself looks like this ...50Hurts - Full-screen 50Hz 1-pixel scrolling on a 128K Speccy50Hurts - Full-screen 50Hz 1-pixel horizontal scrolling on a 128K Speccy. Graphics are an obvious nod to Joffa, whose games and banter were a big ins…
... I am waiting until the Floating Bus hits 2/3 of the screen ... working for lines 1 and 2, and then not drawing anything ... ; Draw a 32 char bar 2/3 down screen
ld ... to left, Column 28 to 2
org $a000 ;
level ...Fastest emulator screen renderingHi, I'm developing an algorithm for fast emulator screen rendering and here is what I came up with. 1) Use 4bpp indexed image format as target …
... screens? i.e, more than 2 colours per attribute square.[/quote ... writes, and border changes,
2) calculate the position where ray ... read whatever's on the bus, and detect that the ray ... />
It's the ULA "Floating Bus" and yeah, it generally returns ...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…
... br /> 48K 128K +3 ULA bus
-----------------------------
14338 ... doubt you could really read floating bus from even ports.
... is simply 6 contended and 2 uncontended cycles, that's ... think it's stock floating bus test just modified to ...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 …
... all for 48k and 128k/+2 machines and Chris was able ... is no floating bus to test it with (which was 2 years ago ...
