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Some thoughs about fast scrolling on 128 modelPlease, consider this article as technically interesting concept not a proven algorithm. ONE The fastest scrollers use long sequence of PUSH inst…
... no limit on software emulated registers.
Emulation of PUSH ... things by reserving other hardware registers to common patterns like ... generic wall tile. And IX, IY registers also may payoff.
registers.
If we prepare ... -
Nasty 'Gotcha' for multicolour timingI thought I would be better developing my multicolour routine on the 48K first, being the slowest, so it would then be sure to work on the 128K varia…
... twice again but with other registers. This is to lay down ... whether you use DE, BC, IX or IY, the instructions all ... I can do LD (nn),IX followed by LD (nn),HL ... .g. POP IX and POP Hl to refill those registers with new ... -
z88dk and im2I set up a minimal IM2 mode so I can draw sprites for a laff [code] #include <string.h> #include <stdio.h> #include <im2.h> #include <stdlib.h> #in…
... int
push af ; preserve registers.
push bc
push ... br /> push de
push ix
rst 56
... update clock.
pop ix ; restore registers.
pop de
IX register - using/problemsAre there any rules on using the IX register? Are there any restrictions on the memory locations that it can access? Yes, I know it's slower than us…
... any rules on using the IX register? Are there any restrictions ...Scrolling Bi-Colour Engine for 4-Player GamesJust putting this code up for people to have a look at. Far from finished. Should simply compile and run a bit of a demo. Only good for 128K and +…
... a,I
ld a,(IX+0) ;odd time-wasting instructions ...SBC IX,DE/BCAlways wondered why there wasn't a SBC IX, DE/BC command.... so have to use PUSH HL ; save original HL PUSH IX ; IX on stack POP HL ; IX …
... there wasn't a SBC IX, DE/BC command....
... save original HL
PUSH IX ; IX on stack
POP HL ... ; IX value off stack into HL ...
POP IX ; and off again into IX
POP ... I need to use IX this time as HL is ...Interview with Zilog FoundersIt's almost eight years old now so maybe this has done the rounds once already, but in case you missed it: [url]http://archive.computerhistory.org/r…
... mention of splitting the index registers IX and IY into two eight ...New version emulator ZEsarUX-1.1Hi I have uploaded a new version of my ZX80/81/Spectrum emulator on [url]http://sourceforge.net/projects/zesarux/[/url] Changes are: Added suppo…
... cpu registers option with opcode dissassemble
Fixed opcodes LD IX/IY ... (h/l),IX/IY(h/l)
Double Buffer UtilityHi Folks, I've been experimenting with double buffering on a 48k Speccy for a small project I'm working on. After reading lots of good advice here…
... DE','PUSH HL','PUSH IX','EXX\nPUSH BC','PUSH ... ','POP BC\nEXX','POP IX','POP HL','POP DE',' ... ','PUSH BC\nEXX','PUSH IX','PUSH HL','PUSH DE',' ... br /> self.restoreRegisters() #8 - Restore registers
self.enableInterupts() #9 - ...IX+n and self modifying code and pasmoI'm using pasmo and if I wanted to use ix+n like this: (ix holds the position to a sinus table) ld (symbol), a LD a, (ix+symbol) What I want to do…
... if I wanted to use ix+n like this:
< ... br /> (ix holds the position to a ... (symbol), a
LD a, (ix+symbol)
What I ... is to use LD a, (ix+n), but declare n as ... out except spin assembler's (ix) discussion :)
And ...+3DOS routine missing in the +3 manualThe other day I realised the details of the +3DOS DOS DELETE routine are missing in the [url="http://www.worldofspectrum.org/ZXSpectrum128+3Manual/ch…
... the entry points and entry registers of all routines are regular ... /> BC DE HL IX corrupt
All other registers preserved
[/code ...New version emulator ZEsarUX-2.1Hi I have uploaded a new version of my ZX80/81/Spectrum/Z88 emulator on http://sourceforge.net/projects/zesarux/ Changes are: Added Cocoa…
... envelope name on View AY Registers
Added show musical note ... condition breakpoints:
-Indirect registers: (HL),(IX),etc
-Join expressions with ...Floating Point Package Math48<br>I came across a neat little floating point package for the z80 and I'm adapting it now to work with z88dk and sdcc. There is an interesting…
... the floating point operands in registers. The floating point format is ... float values are kept in registers BCDEHL with L the exponent ... keeps another operand in BC IX DE (approximately). It also looks ...Z88DK v1.99B ReleasedAt Sourceforge: https://sourceforge.net/projects/z88dk/ It's been a year since the last release so it was time for another. This is another tran…
At Sourceforge:
https://sourceforge.net/projects/z88dk/
It's been a year since the last release so it was time for another. This is another transitional release on the way to version 2.0 and hopefully we'll get there for the next one ...The point of IX+1 IX+2 ?the numbers that you can add-on to IX and IY seem hardcoded, so I dont see the use of that feature? any examples of the use of IX and IY plus number…
... you can add-on to IX and IY seem hardcoded, so ... examples of the use of IX and IY plus numbers?
Restoring AY registersAfter doing (not still finished) the sna to tap converter, I'm going to try to do the same for 128k snapshots. I've got threee ideas about what to do…
... code to restore CPU registers and execute the program ... before restoring CPU registers).
AY registers would be " ... more time passes between registers load and program execution ... notes inmediatly because the registers are loaded; with procedure ...ZEsarUX-7.1Hi! There’s a new stable version of ZEsarUX, version 7.1! The next 24th of September it will be 5 years old :) So this is a special anniversary…
... /> 3=PC
DE>IX
etc...
*Optimized debugger ... (&), OR (|), XOR (^) when using registers/variables breakpoints/watches
*Breakpoints ... bug reading AY registers: unused bits for registers are set to 0 ...converting sna to tapsince i'm struggling to find a simple sna to tap converter that works fine on gnu/linux, i'm about starting to code one on my own (using a scripting …
... 1.25kb - remaining 8kb and registers - 1280+something (48?)
60 ... /> ld iy,nn
ld ix,nn
im x
$0F IY
$11 IX
$13 IFF2 [Only bit ...esxDOS v0.8.9 has been officially releasedhttp://board.esxdos.org/viewtopic.php?pid=2025#p2025 [quote]lordcoxis Today 12:35:17 esxDOS v0.8.9 has been officially released. Grab it at http:…
... /2021] Kernel: Saved HL, IX and IY registers before RTC.SYS call ...undocumented Z80I am documenting a feature nobody has done before and no emulator gets right at this time. I'll have a report after doing some more tests. Fraser.
... .
All instructions with (IX+d) give flag bits 3 ... arithmetic on 3 16 bit registers so their quite hard to ...Anyone got a copy of 'Z80 for primates'?This Z80 lark isnt easy, in fact it makes me feel very much like Washoe the chimp trying to learn learn sign language, I just dont think I've got the…
... specific addresses for the Ay registers or does this work ... apply equally to all registers. This causes the registers to have typical ... usually means making sure the registers are used in their ... operand, does it all
IX = 16 bit index register, secondary ...Anyone got a copy of 'Z80 for primates'?This Z80 lark isnt easy, in fact it makes me feel very much like Washoe the chimp trying to learn learn sign language, I just dont think I've got the…
... specific addresses for the Ay registers or does this work ... apply equally to all registers. This causes the registers to have typical ... usually means making sure the registers are used in their ... operand, does it all
IX = 16 bit index register, secondary ...Horizontal scrollDoes anyone know how to do a 2 or 4 pixel left or right horizontal scroll of the spectrum screen. I can make a 1 one pixel scroll with: ... rl (hl…
... . Increase efficiency by using more registers at once (eg POP HL ... , DE, BC, IX, IY, BC',DE',HL' and ...AssemblersProbably asked a question that's been asked a million times before... but... I've decided to do a bit of old Speccy machine coding again, after 20 y…
... />
Hmmm... Just poke the registers with the correct values and ... ROM (#04C2=SAVE, #0556=LOAD; IX=start, DE=length, A=#00 ...An MC question (sorry, there's no MC forum to post to!)Ok, still struggling with learning MC - but am getting there. I just can't find anywhere on the web / in books that explains how to do arrays in MC.…
... BTW, the speccy has index registers too, which would appear to ... of the 16-bit index registers IX or IY). Typical instruction:< ... reads a few from (ix+d) into registers, does some calculations, ... read from the ix table beforehand into registers, the time consuming ...need help with speed optimization. this procedure draws a sprite with mask from memory onto the screen with x-coordinate in pixels. it doesn't shift sprites in realtime, it just uses …
... to use parts of IX and IY registers as a 8-bit ... registers? If yes, what are the ... optimize with using of those registers.
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