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Z80 Processor Interupt helpHi everyone, Currently designing a Z80 computer and i need a little help with these interupts. If i have an I/O device that sends a pulse to the int…
... these interupts. If i have an I/O device that ... the infomation into a register and then continues?[/QUOTE]< ... your I/O device can supply a status register with a ... the current value of I register will form a 16 ... Z80 reads a status register inside the TMS to ... -
Emulating the 128KeIt occurs to me that I wasn't frequenting WoSf when I created the 128Ke standard, which means some people haven't heard of it. Here it is: [url]http…
... pieces of software (Chase HQ, I think...?) went ahead and followed ... are there of software that [i]crashes[/i] when run under the ... contention patterns? The only place I know of where contention is ... is stuff that puts the I register in contended memory, which is ... -
Emulating the 128KeIt occurs to me that I wasn't frequenting WoSf when I created the 128Ke standard, which means some people haven't heard of it. Here it is: [url]http…
... software requires the +2A contention. I'm aware that some, possibly ... are there of software that [i]crashes[/i] when run under the ... contention patterns? The only place I know of where contention is ... is stuff that puts the I register in contended memory, which is ... -
RAND USR that doesn't work in emulators and clonesEons ago, I "discovered" a strange RANDOMIZE USR. This is it: [b]RANDOMIZE USR 46578[/b] Using it on a genuine ZX Spectrum rubber key or Plus model,…
... a final thought... I'm considering repeating the ...
As I expected...
Today, I've tried two ... br /> Sometimes (Zilog) The I register keeps its value as well ... the last value of DE register, that is, 4444h.
Quickly I change the jumpers on my ... -
writing an emulator-newbie needs helpHi, this is my first post here. I decided to write a minimalistic emulator of ZX Spectrum-no emulation of advanced peripherals, no emulation of sound…
... 16-bit addition/subtraction I finished my CPU emulation ... display_screen() routine? All I see now is black ... 3. How do I handle interrupts? I mean, is increasing t_states ... 1, push the PC register onto the stack and ... value of PC from the I register, and use $FF ... -
z80 Startuphi everyone, does the z80 upon start up reset all registers (including A) to 0? Many thanks, Robin
Higher memory is not being accessed but you may be seeing memory refresh cycles which occur after every opcode fetch. That has the address IR (I register, R register) placed on the bus. -
Kobrahsoft DB1 - doesn't work?Hi, I've tried loading [URL="http://www.worldofspectrum.org/infoseek.cgi?regexp=^DB1$&pub=^Kobrahsoft$&loadpics=3"]DB1 by Kobrahsoft[/URL] into two …
... use of the R-register which I didn't know anything ... about until I read [url=http://www ... SamDisk090906" at the start? I thought that it might have ... .
Will the I-register always be set to $3F ... 's what the R-register is getting set to ... -
Kobrahsoft DB1 - doesn't work?Hi, I've tried loading [URL="http://www.worldofspectrum.org/infoseek.cgi?regexp=^DB1$&pub=^Kobrahsoft$&loadpics=3"]DB1 by Kobrahsoft[/URL] into two …
... won't work, as the I-register will be set to $ ... With auto-load set the I-register will be set to $00 ... be ready to use. I presume that the first CALL ... . More experimentation is needed. I still had the DB1 disk ... tape transfer worked OK when I switched to a blank ... -
Kobrahsoft DB1 - doesn't work?Hi, I've tried loading [URL="http://www.worldofspectrum.org/infoseek.cgi?regexp=^DB1$&pub=^Kobrahsoft$&loadpics=3"]DB1 by Kobrahsoft[/URL] into two …
... motor, disk status register and disk data register (according to page ... br />
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I checked those four emulators again ... they start off with the I-register reset; Fuse and RealSpectrum ... value ($3F) in the I-register, unless auto-load is enabled ... -
Empire! Help neededCan anyone convert the listing in the Tipshop to Multiface pokes? Im having a hard time with this game, over 15 years playing it, now I could do wit…
... & 128k models, as the I register is set to $39 on ... -
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…
... ;loadpics=1
Same problem, I register is set to #3A
I cant open it now at ... -
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…
... ;loadpics=1
Same problem, I register is set to #3A
EDIT - 1: I tried the "cure" for Hexagonia ... list in Velesoft?s site, I cant open it now at ... -error.zip[/url][/QUOTE]
I perused the list - almost all ... -
New Game! Maritrini, Freelance Monster SlayerAfter experiencing the sweet taste of success, Maritrini woke up one fine day in a mess of bed sheets and with the biggest hangover she could remembe…
... it worked fine. Anyhow, I'll look into a fix ... there any emulators where I can test this snow effect ... (must be enabled at ). I think the latest ZXSpin versions ... only needs to set the I register (and table) for IM ... pagination).
PD: I see you've used FD ... -
Double Dragon Remake: The Development ThreadOk guy's, so this is the new thread that will be focusing on Jim Bagley's development of the Double Dragon remake that was first proposed by myself a…
... it (must be enabled at ). I think the latest ZXSpin versions ... only needs to set the I register (and table) for IM 2 ... -
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…
... is that you have the I register set to $FD and the ... +3 manual warns that setting I to a value between $C0 ... is paged in.
I'd always assumed that was ... ram was paged in, but I wonder if there is something ... -
Manic Miner ZX81Hi Guys, Can anyone explain why [url=http://www.worldofspectrum.org/infoseekid.cgi?id=0017539]Manic Miner ZX81[/url] is not able to reproduce the ex…
... =joefish;609197]As far as I can tell from the write ... does not support "real hires" (i.e. the freedom to draw ... it does not allow pointing register "I" to RAM, where you would ... built-in RAM supported the "I" register pointing to RAM, although this ... -
Manic Miner ZX81Hi Guys, Can anyone explain why [url=http://www.worldofspectrum.org/infoseekid.cgi?id=0017539]Manic Miner ZX81[/url] is not able to reproduce the ex…
... MM ZX81.
I think I recall now that the ... scanline. How the I and R register affect rendering of the ... line... I'll need ... you cannot point the I register to standard 16K RAM ... expansion.
I'm so used to a ... -
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'…
... issue?
I am basicly clueless, and I've been advised ... that it's just the I register which causes the problem. Your ... problem, as long as the I register is not $40-$7F (or ... /> Ideally, you should change the I register to a safe value (making ... -
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'…
Hmmm I'll double-check, but I thought I had.
Is "0" a proper value for the I register to avoid the effect? 'cause that's what I'm using. I guess it is, the ROM is not contended...
PS Thanks for trying :) -
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.
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 ... byte. :)
I've tested it on mine ... -
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…
Set the I register to 25. This is within ROM and Legal. When I is set to 25, due to the ROM values of (25*256+255) and (25*256+256) ie. the Word at 6655, a call is made every interrupt to 23842, where i place a JP to your interrupt routine. -
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 32 ... me crazy and I need a break, I imagine this can ... sprites? scrolling background?
I think it means unattributed sprites ... interrupts
ld a, 254 ;i register looks to 65024 to find ... -
Help pleeease "Proving Emulator OpCode flags are correct"So I had a cunning plan... I wanted to write a test harness for Emulators that could "prove" that all opcode flags were correct. I wanted something m…
... communications at 19200 (so I use 9600) as corruption ... br />
Although interesting, I doubt that this brute force ... factors which [I]can [/I]influence the outcome. I cannot think of ... mysterious side effects when the I register contains 42...
... -
Fusetest port 0x7FFD test resultsHi, I'm adding the Spectrum 128K emulation to my FPGA core running on the V6Z80p platform. I'm doing some tests; running Fusetest, the machine is se…
... a typo)?[/QUOTE]
I believe this behaviour only occurs ... a given value of the I register. I don't have one though ... so I don't know what else ... -
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 ... in this regard. ;)
I notice that the PAL-TV ... 's already such a provision, I couldn't find it.
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…
... stuff! By emulating the I register crash on 128k, JSSpeccy ... regard. ;)
I notice that the PAL-TV ... already such a provision, I couldn't find it.< ... in the Arkanoid bricked screen, i.e.
... feature used by nobody, I fear. Anyway, a JSpeccy ...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 ...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 crash emulation in the "I register, 128/+2, contention" megamix would have come handy when we were developing Maritrini :lol: But this is great news: every game we code will be tested in this emulator for sure. Thanks and good job!
