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Strange behaviour in real hardware but not in emulatorsWell, at least not in any emulator I've tried. I've been reported by fellow forum member Macc that both our Maritrini Monster Slayer and Retroworks'…
... na_th_an;610014]Hmmm I'll double-check, but I thought I had. < ... a proper value for the I register to avoid the effect? ... cause that's what I'm using. I guess it is, ... pick any legal value, I just suggested that to ... absolutely fine. No snow and certainly no crash. -
Maritrini and Cray 5 loading problemsHas anyone else here had issues loading either of these on a 128k? No matter what I try, both these games refuse to load properly. I can get both t…
When the I register is in contended RAM on ... or +2 Grey the ULA snow will appear. The +3 and ... -
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…
... restricted palette of only 4 register pairs you can get ... me crazy and I need a break, I imagine this can ... things, drawing sprites? scrolling background?
I think it means unattributed ... interrupts
ld a, 254 ;i register looks to 65024 to find ... -
JSpeccy v0.90Hi4all, A new JSpeccy version has been released at my project webpage. This new release have many corrections, some optimizations and a few new feat…
... ]Great stuff! By emulating the I register crash on 128k, JSSpeccy is ... disadvantage is the poor scrolling smoothness.
Horizontal scrolling text is particularly ... -
JSpeccy v0.90Hi4all, A new JSpeccy version has been released at my project webpage. This new release have many corrections, some optimizations and a few new feat…
The scrolling seems just the ... of them - congrats! The I register crash emulation is pretty interesting ... />
If I could offer a couple of ... usability suggestions while I'm here? Hope you ... 'are you sure?' message boxes. I'm always sure. :)
... -
JSpeccy v0.90Hi4all, A new JSpeccy version has been released at my project webpage. This new release have many corrections, some optimizations and a few new feat…
... QUOTE=Lee Tonks;629080]The scrolling seems just the same to ... best of them - congrats! The I register crash emulation is pretty interesting ... couple of usability suggestions while I'm here? Hope you don ... 'are you sure?' message boxes. I'm always sure. :)
< ... -
JSpeccy v0.90Hi4all, A new JSpeccy version has been released at my project webpage. This new release have many corrections, some optimizations and a few new feat…
... QUOTE=Lee Tonks;629080]The scrolling seems just the same to ... best of them - congrats! The I register crash emulation is pretty interesting ... couple of usability suggestions while I'm here? Hope you don ... 'are you sure?' message boxes. I'm always sure. :)
< ... -
Zymosis -- WTFPL'ed Z80 Emulation Corebreaking news! i'm back with another useless project: new Z80 emulation core written in pure C! i hear you screaming: "oh, no! WHY?!" let me tell yo…
I am not sure that FBZX ( ... the snow effect.
For each opcode if the I register is ... the video memory using the register R as an additional offset ... />
if((procesador.I & 0xC0) == 0x40) { // (procesador.I>=0x40)& ... -
CyberbigI found out that Cyberbig is affected by snow effect in FBZX Wii. There is snow in the all screens except in the main menu. I checked that also Spe…
... a reset is produced when I is between 0x40-0x7F ... or I >= 0xC0 and the ... ULA bug which causes snow when I is set to point ... crash the machine shortly after I is set to point ... form of interaction between the I register content and the own ... -
Games that crash because of contended memory.I find these are really annoying. You load up a game like Astro Marine Corps, Fantasy World Dizzy, Dizzy: Prince Of The Yolkfolk and so on (the init…
... causes a crash when the I register points into contended ram. Emulators ... the Spectrum unconditionally when reg I is between 0x40-0x7f.
Anyway, I have a spanish Amstrad +2 ... resets when I load Robocop 3. I can see the snow effect but ... -
Composite picture qualityI have read many many discussions here about the composite video modification of the Spectrum 16/48K models. I have choosen one of the simplest comp…
That's a fix for the ULA snow effect when the Z80's I register is set to point at contended memory. Won't do anything for the picture quality.
B -
Skate Crazy on grey +2I've downloaded "Skate Crazy" from WoS, recorded it on a real tape and tried to load to my grey Spectrum+2. Game (both parts) works only in 48k mode.…
... QUOTE=Interceptor;725055]
I think I asked about this to ... a looooooooooooong time ago) as I was curious why the emulators ... causes a crash when the I register points into contended ram. ... an emulator that supports ULA snow (such as SpecEmu)
... -
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…
... of processing logic that I'm implementing for various ... graphical stuff.
I hadn't considered the uncontended ... with this in mind I see I can safely move the ... shouldn't set the I register to a value in ... the same as the snow effect which is caused ... -
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 register to 37, you can use the ROM and avoid any snow ... but this is the one I use on pretty much all ... all models, as far as I can tell, using emulation. Even ... -
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…
... bugs. If the "I" register points into contended memory, snow will appear on ... the display. If the "I" register points into ... the top 16k without seeing snow and you can't ... :)
[quote]
I think you should work on ... -
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…
... bugs. If the "I" register points into contended memory, snow will appear on ... the display. If the "I" register points into ... will neither crash nor produce snow on the display. -
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…
... . If the "I" register points into contended memory, snow will appear on ... the display. If the "I" register points ... will neither crash nor produce snow on the display.
... crash when I set I to $40–$7f. I get the snow, sure, ... -
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…
... . If the "I" register points into contended memory, snow will appear on ... the display. If the "I" register points ... will neither crash nor produce snow on the display.
... crash when I set I to $40–$7f. I get the snow, sure, ... -
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…
... . If the "I" register points into contended memory, snow will appear on ... the display. If the "I" register points ... will neither crash nor produce snow on the display.
... crash when I set I to $40–$7f. I get the snow, sure, ... -
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–…
... to the actual ULA [i]snow[/i] effect, rather than a ... these machines, the ULA snow effect works a little ... , the snow effect kicks in if the I register is in ... , then the snow effect will appear [i]as long as ... will cause the snow effect, even though I is 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–…
... state which cases cause snow and which actually crash ... I register when a contended RAM bank is paged in causes the snow ... —is, If you see snow, you might get a ... ]
Ideally, yes. I think they ran out of ... var elsewhere).
I’ve seen a few games ... -
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 $40–…
... .”[/quote]
I'm pretty sure he meant ... were also talking about snow. He did leave out ... ld a,$c0
ld i,a
ld a,% ... a special version of [i]Yankee[/i], which pages in ... snippet that changes the I register within my ISR (with ... -
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–…
... The I register pointing to $40–$7f causes ULA snow and ... a crash. Or does it?[/u][/b]
I ... think the cause of the crash is different to the snow ... contents of the refresh register (R) are placed ... of the interrupt register (I) is put 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–…
... also mucks about with the I register but restores it prior to ... . Odd banks produce the ULA snow effect; even banks don’t ... crash
2. No ULA snow
Additional tests:
snow effect is triggered not just by setting the interrupt register to ... -
Grey +2 with lines on some games on RGB connectionHi Everyone, Is it OK if I ask a question? I dug my +2 out of the loft after far too many years about a month ago, and I have finally got it ba…
More info on the ULA rain/snow effect: https://www.worldofspectrum.org/forums/discussion/55839/the-i-register-pointing-to-40-7f-causes-ula-snow-and-a-crash-or-does-it/p1 -
Grey +2 with lines on some games on RGB connectionHi Everyone, Is it OK if I ask a question? I dug my +2 out of the loft after far too many years about a month ago, and I have finally got it ba…
... rain/snow effect: https://www.worldofspectrum.org/forums/discussion/55839/the-i-register ... -pointing-to-40-7f-causes-ula-snow-and-a ... /> Thanks also for your assistance, I really appreciate it :) -
Quiz V - the revenge of D`n`C Ok, 50 quick fire questions.. some cryptic - you`ll have un unravel the clues to get the game name, while others are description of the game. Ther…
... answers on here.
I will put the answers up ... point)
5: Scrolling, rolling shoot `em up. Destroy ... -
Newer name of the gameI can't find out the name of my old favourite game. This was a Boulder Dash style game, but no scrolling screen. I think you had to collect ?beer? or…
I can't find out the name of my old favourite game. This was a Boulder Dash style game, but no scrolling screen. I think you had to collect ?beer? or something else.
Pls help!
