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Border Tron vector tableI've been trying to use the Border Tron border creator, but the vector table is created where code to my game is at (FE00 I think), how would I go ab…
[QUOTE=daveysludge;740194]I've been trying to ... is at (FE00 I think), how would I go about relocating ... table to say 30000 as I don't understand hex ... about it by loading the I register with the MSB of ... table address: "LD I,address/256" -- I've taken the decimal ... -
Cybernoid POKE required.Ummm, I'm not absolutely sure this is the right place to post this, but is there a POKE to remove the music from Cybernoid 128k? I still want to kee…
... have a look at the I register. That'll point to the ... the 3 channels. :)
I should qualify this by saying ... I have no idea whether or ... works in this way, but I'd be surprised if it ... -
AMX mouse emulationI'm trying to add AMX mouse emulation to Spud but not getting very far. I can get a reaction to button presses but nothing to moving the mouse. …
... on my HD. I suspect I wrote it (I do own an AMX ... mouse) although I may have just collated the ... with all AMX mouse software I could get hold of ... usual way by using the I register as the high byte.
AMX Art sets I to 0xee which means A ... -
AMX mouse emulationI'm trying to add AMX mouse emulation to Spud but not getting very far. I can get a reaction to button presses but nothing to moving the mouse. …
... on my HD. I suspect I wrote it (I do own an AMX ... mouse) although I may have just collated the ... with all AMX mouse software I could get hold of ... usual way by using the I register as the high byte.
AMX Art sets I to 0xee which means A ... -
Fire n' Ice, is it possible to convert it tp tap. or tzx?Wathching a little bit the video from this game in rzxarchive, and it is really outstanding. So I was wondering if its possible to make the trd file …
... . It shouldnt be too difficult, I have a modified TRDOS ROM ... 's a lot of blocks. I'm at world 6 using ... to the end dumping as I go then snapshot to see ... patches in. Oh and the I register is not within contended RAM ... -
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 ... don't resets when I load Robocop 3. I can see the ... -
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,…
... br /> Sometimes (Zilog) The I register keeps its value as well ... was kept there. If I'm true, that value ... the last value of DE register, that is, 4444h.
... A has not changed, I can assume that this ... to execute.
I repeat that this doesn't ... -
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,…
... clear the I register on RESET, testing the I register is the ... 0000, as long as I is normally set to ... :
[code]LD A,I
OR A
... ,&3F
LD I,A ; Ensure I0[/code ... br /> Unfortunately, almost all emulators I have tested implement a user ... -
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,…
... is specified to clear the I register on RESET[/QUOTE]
I have tested implement a user ... special reset, albeit without realising I suspect! -
DiscipleI have got a Disciple Disk Interface, with no manual, software. I have downloaded the PDF Manual from WOS, which says I have to load the operating…
... worried about copy-protection. Although, I keep finding evidence to suggest ... ve been nice if the I register had been moved to a ... games without using snapshots, so I learned something.
[ ... DISCiPLE. Good to know, I suppose. Hopefully this wasn’t ... -
DiscipleI have got a Disciple Disk Interface, with no manual, software. I have downloaded the PDF Manual from WOS, which says I have to load the operating…
... ve been nice if the I register had been moved to a ... games without using snapshots, so I learned something.[/quote]
< ... ’s point of view, I’m starting to see that ... it out? (If so, I was not aware of this ... all of them). Memory-mapped I/O at various places, ... -
Games not compatible with the 128+ & grey +2Like the +2A & +3 thread, there are a few games that do not work correctly on the original 128+ and the grey +2. Two games that I know of that wil…
... jp;835056"][quote="Jmk;835006"]...I haven't worked them out ... unfinished business!
Now, I can see this is going ... more complicated than I thought.
The I register is set to ... little more difficult, as I was hoping I could just swap 1 ... -
Games not compatible with the 128+ & grey +2Like the +2A & +3 thread, there are a few games that do not work correctly on the original 128+ and the grey +2. Two games that I know of that wil…
... is never overwritten. So, the I register can be pointed to 143 ... -
How did bank switching work on the 128K Spectrums?I'm new to Z80 and ZX Spectrum. So I was wondering how the 128+ models managed to work with more than 64K of memory? I'm somewhat familiar with h…
... memory bank (this means the I register is pointing into a contended ... but if you're changing I, it's a good idea ... -
The I register and IM 1Hi al! I've been doing some coding, replacing the BASIC ROM with my own code and upon examination of a few 16Kb cartridges, all the ones I've look…
The I register and IM 1Hi al! I've been doing some coding, replacing the BASIC ROM with my own code and upon examination of a few 16Kb cartridges, all the ones I've look…
I think the answer maybe related to in what other circumstances does the contents of the I register get put on the address bus...The I register and IM 1Hi al! I've been doing some coding, replacing the BASIC ROM with my own code and upon examination of a few 16Kb cartridges, all the ones I've look…
[quote]Q-1: I AND R REGISTERS. What they ... refresh, the contents of the I register are placed on the upper ... the wrong value in the I register can cause the ULA to ... refresh cycle.
[b][i]Mark[/i][/b]The I register and IM 1Hi al! I've been doing some coding, replacing the BASIC ROM with my own code and upon examination of a few 16Kb cartridges, all the ones I've look…
I guess that's one possible ... , a Pacman coin-op machine, I'm guessing, doesn't suffer ... that need it?
I may do a bit more ... debugger immediately upon reset, the I register holds 63 in it anyway ...No contended memory?Sorry if this is a stupid question. But I'm trying to learn more about the ZX Spectrum. If I had a stock 48k Speccy and I could wave a magic wa…
... , memory corruption if the Z80 I register is set to point to ...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.
BZX Spectrum CartridgesI have been thinking of "cloning" ZX Cartridges for a while (case, board and silicon skirt), to be able to make new releases or replace damaged cartr…
It's uncommon, to have I register set to #00, and toggling ... bit 7, R register in sequence.
I defined something that ... I think is uncommon enough ...ZX Spectrum CartridgesI have been thinking of "cloning" ZX Cartridges for a while (case, board and silicon skirt), to be able to make new releases or replace damaged cartr…
... quote="RMartins;864214"]
- If (I + R) refresh address, match our ... during paging operations? Or am I missing something?[/quote]
... software, use and abuse the I register, when exceptions are disabled, ... ZX ROM default, so I register might end up with a ...ZX Spectrum CartridgesI have been thinking of "cloning" ZX Cartridges for a while (case, board and silicon skirt), to be able to make new releases or replace damaged cartr…
... br /> [code]ADDR, ADDR, ADDR, I/R, dataAddr[/code]
;Output A = data
LD I, A ; Set command
LD ... with interrupts disabled, so that "I" register can be safely changed.
LD I, A ; Set command
LD ...Interrupt routineI have been trying to create an interrupt routine for playing AY music in the background but cant seem to get anything working. I have a music rou…
... IM2, so that interrupt pointer (I Register + bus byte) can point to ...Interrupt routineI have been trying to create an interrupt routine for playing AY music in the background but cant seem to get anything working. I have a music rou…
This is what I've got so far but ... table 46080
LD I,A ; Set I register to this
IM ...how to fix instructions on screenI have a problem with my sequencer. I want the top half of the screen to stay fixed but allow the note values to print without pushing the instructio…
... by the lady whose name I forget, it says under no ... IM. Why?[/quote]
I think you must be referring ... , and also requires the Z80 "I" register to be preloaded with a ...Spectrum 48+ 4S - Upper RAM issue, and now a self-created problem!I recently picked up a known-flaky spectrum off eBay, to have a bit of fun fixing it and reliving youth. It was labelled as 'keyboard duff, shows…
... contents of the R register and the I registers to the address ... A7, the contents of the I register goes to A8 to A15 ... value held in the R register, except for bit 7, ... br />
The only test I can think of that you ... off).
[b][i]Mark[/i][/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 one ... (a looooooooooooong time ago) as I was curious why the emulators ... causes a crash when the I register points into contended ram. Emulators ...
