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On 48k, can I copy 4k before next screen updateFollowing on from my thread at [url="http://www.worldofspectrum.org/forums/viewtopic.php?topic=6423&forum=11"]http://www.worldofspectrum.org/forums/v…
... will have to delay the start of your copy routine after the ... this time, if your copy routine is still running, you will ... -
Cobra - scrollingHi everyone, I have been studying some of the code in Ocean' Cobra game using a debugger, in the hope of improving my own scrolling routines. In cas…
It's waiting for bit 7 of R to be set. Bit 7 can only be changed in software using LD R,A. Look in the interrupt service routine.
The delay must be measured in multiples of 20ms. -
Cobra - scrollingHi everyone, I have been studying some of the code in Ocean' Cobra game using a debugger, in the hope of improving my own scrolling routines. In cas…
... code is some sort of delay. Though I'm not sure ... this way, though; just doing HALT would have the same effect ... -
Sprites flickeringI am trying to write a Spectrum game in machine code. I am still a beginner in programming, however I did much progress recently, i believe. Now I am…
... 's no point to your delay because clearly you are not ... />
If you use a HALT instruction then the CPU will ... -
Sprites flickeringI am trying to write a Spectrum game in machine code. I am still a beginner in programming, however I did much progress recently, i believe. Now I am…
... . I start with HALT command to begin my routine with new interrupt ... -
Sprites flickeringI am trying to write a Spectrum game in machine code. I am still a beginner in programming, however I did much progress recently, i believe. Now I am…
... :22, Ralf wrote:
My routine is as follows
1 ... sprite into background
3. Delay loop
4. Draw stored ... -
FrameSyncIt was many many years ago since i programmed assembly on the spectrum but I just picked it up again for fun. Now this is one thing I can't remember…
Using Halt is fine for this sort ... at some point if using halt, otherwise you would never get ... returned to your routine, ie. the instruction imediately following HALT.
routine that way you could start ... -
divIDE issuesI discovered a few issues with the divIDE hardware and FATware software that may be of interest to some people. 1. ROM paging If your Spectrum is a…
... snapshots loading. The IM2 detection routine is mistakenly overwitten by the ... location). Without measuring the delay of ROM-routine execution time, no software ... -
New ZX Adventure Club Game - First Half of NovemberAnd starting today it's: Just in time for Hallowe'en :) [url="http://www.worldofspectrum.org/infoseek.cgi?regexp=^Scapeghost$&pub=^Level+9+Computin…
... 've to perform this distraction routine only when the program tells ... but I was unable to delay the gang till the critical ... -
New ZX Adventure Club Game - First Half of NovemberAnd starting today it's: Just in time for Hallowe'en :) [url="http://www.worldofspectrum.org/infoseek.cgi?regexp=^Scapeghost$&pub=^Level+9+Computin…
... 've to perform this distraction routine only when the program tells ... but I was unable to delay the gang till the critical ... -
Pocket Clive - 2 QuestionsHello, I've just started using Pocket Clive on my iPaq pocket PC, excellent emulator BTW. 1. I have just wrote a small BASIC program to randomly pi…
... PAPER).
Therefore the routine probing the 'floating bus' is ... can safely insert a halt instruction at a convenient ... further, by possibly relocating the 'halt' instruction.
However, ... perfect patch since the 'halt fix' method undoubtedly uses ... -
Assistance with IM2 routineI subsequently got a working IM2 routine.
... certain about calling a ROM routine from within an interupt though ... be dangerous, such as using HALT? (Use a debugger or the ... -
Homing missile routine - help neededI am attempting to write a routine which will allow a missile to home in on a player. Basically the sort of thing you see in most shoot-em-up games. …
... /> I coded a homing missile routine some time ago for a ... target (as a warm-up delay)
-Draw some animation ... -
Sprite adviceHello. So, I'm slowly getting to grips with Z80 assembly - currently equal parts frustration and enjoyment. Now looking for some advice to help shift…
... screen address from the above routine.
[CODE];---------------------------------------------------------------;
; Incy ;
halt instruction just before you start ... -
Spectrum Game NewsSome snippets of Spectrum game news , via the RT forum and micro mart if you guys are interested.... [url]http://www.retro-trader.com/forum/index.p…
... , there has been a minor delay due the PEGI ratings , so ... original deals ground to a halt , was REAL distribution into shops ... -
Sprite adviceHello. So, I'm slowly getting to grips with Z80 assembly - currently equal parts frustration and enjoyment. Now looking for some advice to help shift…
... the drawing routine:
[code]
spritedrawroutine
halt
... simple "xorsprite at hl" routine. It needs hl to ... [/code]
the routine still works, but now draws ... I simply duplicate the entire routine from spritedraw down, it ... -
Sprite adviceHello. So, I'm slowly getting to grips with Z80 assembly - currently equal parts frustration and enjoyment. Now looking for some advice to help shift…
... on PC, quite a gonzo-routine on Z80. This
; could ...
; ----------------------------
; Faster than previous routine.
; Uses only one 16 ... -
How to speed up TZX loading (emu development)With many newer emulators there are options to do faster loading schemes, even for turbo-loader or protected loader blocks in TZX files. For example,…
... in quick succession. The routine would then scan forward to ... a short delay loop before the edge detection routine. This means ... it was before because the delay loop gets emulated normally.< ... recognition thing for the whole routine. The general idea being ... -
How to speed up TZX loading (emu development)With many newer emulators there are options to do faster loading schemes, even for turbo-loader or protected loader blocks in TZX files. For example,…
... them, along with their initial delay loops.
If there's ... have a generic loader detecting routine (also based on B being ... -
Delay routine requiredI'm putting together a short routine to play some Beep style music. I need to be able to pause between notes when required. These pauses are defined …
... 'm putting together a short routine to play some Beep style ... milliseconds. I'm after a routine that will allow me to ... jump back will cause the delay. -
Scrolling Loader CounterPlease can someone help me with writing a scrolling counter for a loading system. I like the Hewson counter so i`ve taken the font from zynaps loade…
... /> listening port 254
short delay which is performed by an ... somewhere on net, the loader routine is called LD_BYTES (or LD ... -
The BASIC ISRFirst of all, excuse me if my blatant ignorance about this topic makes me write some nonsense :) The thing is that I'm finishing a game in mixed BAS…
... where the vector table and routine are.
Better, IMO, to ... to $fe, then put the routine at $fefe. Less wastage.
HALT or DI before the first (setup) routine too.
routine in the top page, especially ... -
The BASIC ISRFirst of all, excuse me if my blatant ignorance about this topic makes me write some nonsense :) The thing is that I'm finishing a game in mixed BAS…
... where the vector table and routine are.
Better, IMO, to ... to $fe, then put the routine at $fefe. Less wastage.
HALT or DI before the first (setup) routine too.
routine in the top page, especially ... -
The BASIC ISRFirst of all, excuse me if my blatant ignorance about this topic makes me write some nonsense :) The thing is that I'm finishing a game in mixed BAS…
... an interrupt service routine you need to do ... address of your interrupt routine... which is why in ... the address of your interrupt routine is at $fefe.
... table, and your interrupt routine, you then LD I, ... just a HALT before running the setup routine. DI won ... -
Currah MicroSource emulationIt appears to be impossible to emualte the MicroSource in software on the ZX Spectrum SE as hardware polling is required. The following patch is not …
... />
Actually, Andrew, the example routine BloodBaz used to snatch the ... address lines with as little delay as possible. Very few OR ... -
Adding AY music to your plogramI'd like to add some nice tune to my program written in machine code. I am not new to assembler programming but with music programming I have no expe…
... up your own im2 interrupt routine that replaces the one in ... song. So, yes, the ROM routine is totally useless but the ... an im2 interrupt routine, but is instead relying on HALT to wait ... -
Comments for small "sprite" routine wantedI have just written my first machine code program and I am quite happy (and proud) to get it working! :smile: As a child I never learned anything e…
... graphic store
loadloop ;routine to write graphic into screen ...
halt ;halt when all rows is completed
restoreh ;routine for ... -
Comments for small "sprite" routine wantedI have just written my first machine code program and I am quite happy (and proud) to get it working! :smile: As a child I never learned anything e…
... graphic store
loadloop ;routine to write graphic into screen ...
halt ;halt when all rows is completed
restoreh ;routine for ... -
Delay routineAs some people are aware, I have recently starting writing a [url=http://fuse-emulator.svn.sourceforge.net/viewvc/fuse-emulator/trunk/fusetest/]autom…
... to call $8034 for the routine to work... if you don ... .
This version will delay for HL >= 121 t ... -
Delay routineAs some people are aware, I have recently starting writing a [url=http://fuse-emulator.svn.sourceforge.net/viewvc/fuse-emulator/trunk/fusetest/]autom…
... /> org base-29
delay xor a ; 4
or ... hl,de ; 11
jr delay ; 12 33
jump nop ... you will be calling the routine differently, just adjust d1 appropriatelly ...
