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<1234567…34>
  • When would you use LD A,R ?Can anyone tell me a practical use of LD A,R and LD R,A I am confused when you would need to use it? Cheers

    Can anyone tell me a practical use of LD A,R and LD R,A I am confused when you would need to use it?

    Cheers
    robpearmain robpearmain November 2009 Development
  • Using R as a loop counterThis is just something silly I've found a while back. xD [b][How-to][/b] Setup your routine like this:[code] ld a,X ;see below ld r,a loop ;your …

    ... like this:[code] ld a,X ;see below
    ld r,a
    loop
    ;your routine here
    ld a,r
    jr ...
    ld r,a
    .l2
    nop
    inc b
    ld a,r
    Hikaru Hikaru October 2012 Development
  • A.T.R.A.M. (AKA)[URL="http://www.worldofspectrum.org/infoseekid.cgi?id=0000319&loadpics=3"]A.T.R.A.M.[/URL] Could get the AKA "A.T.R.A.M. Commander v Admiral" as pe…

    ... "]A.T.R.A.M.[/URL]

    Could get the AKA "A.T.R.A ... .cgi?screen=screens/load/a/gif/A.T.R.A.M.gif[/img]
    a series of unique COMPUTER AIDED ... .org/pub/sinclair/games-inlays/a/A.T.R.A.M.jpg"]this poster ...
    ZnorXman ZnorXman September 2012 Infoseek database
  • A.T.R.A.M. version 2?[url="http://www.worldofspectrum.org/infoseekid.cgi?id=0000319"]A.T.R.A.M.[/url] users were offered an updated version "From January 1985" with impro…

    ... .org/infoseekid.cgi?id=0000319"]A.T.R.A.M.[/url] users were ...
    spec-e spec-e May 2013 MIA/STP/SDP
  • R.I.P. Mr. R.A. Montgomery[url]http://www.cyoa.com/pages/r-a-montgomery-1936-2014[/url] [quote]Raymond Almiran Montgomery, original publisher and author of the incredibly pop…

    ... ]http://www.cyoa.com/pages/r-a-montgomery-1936-2014[/url]
    a fair amount of the Choose ...
    deadpan666 deadpan666 November 2014 Chit chat
  • R registerI'm cross-posting this as a spin-off of a [url="http://www.worldofspectrum.org/forums/discussion/52748/zx-spectrum-cartridges/p2"]thread in "Hardware…

    ... /> The Z80 CPU contains a memory refresh counter, enabling dynamic ... programmed, resulting from an LD R, A instruction.
    The data ... fetch. Hence R register can be considered a simple counter ... on), increment twice for "LD A,R" instruction, and once for ...
    RMartins RMartins June 2016 Emulators
  • Cheetah R.A.T. Infrared InformationDoes anyone know what the carrier frequency was or the transimission method of the infrared from the R.A.T. stick?

    Does anyone know what the carrier frequency was or the transimission method of the infrared from the R.A.T. stick?
    matalog matalog September 2017 Hardware
  • R.A.M.Now available, portuguese edition of R.A.M.. Enjoy... [img]https://2.bp.blogspot.com/-PpWoVdAebyE/W2tCyylKlHI/AAAAAAAAOOA/C-t4iZXLvB46D76wrjFjODCj…

    Now available, portuguese edition of R.A.M.. Enjoy...

    [img] ...
    Andre Faria Andre Faria September 2018 Brand new software
  • Idk>le me browsing through some game's code >..... [code]61A8 F5 push af 61A9 3EFF ld a,FF 61AB D37F out (7F),a 61AD D33F ou…

    ... ED57 ld a,i
    61DA 67 ld h,a
    61DB ED5F ld a,r
    61DD 6F ld l,a
    ld i,a
    62A9 7D ld a,l
    62AA ED4F ld r,a
    Hikaru Hikaru June 2013 Development
  • Hardware damage due to software?<p>I'm not afraid to ask a stupid question, and I find it incredibly easy to do so in the hardware forum!</p><p>Is it possible to damage your Spectru…

    ... 'm not afraid to ask a stupid question, and I find ... ), or make it break in a particular way, with software?For ... otherwise.Presumably the use of LD R,A as in Joffa's games ...
    R-Tape R-Tape June 2015 Hardware
  • Emulator compatibility with real SpectrumHi emulator programmers... Having spotted for the last 6 months that my iPAQ is still missing a Spectrum emulator I started typing last tuesday - an…

    ... bit 7 of the R register as a flag.
    Be careful ... 7 should only change with a "LD R,A" opcode.
    Are you emulating ... can easily make or break a game!

    The following ...
    Anonymous Anonymous September 2001 Emulators
  • 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.
    Woody Woody October 2004 Development
  • 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…

    ... br /> [code]

    loop ld a,r
    ret m
    jr ... />
    Remember that R is a 7-bit counter only; it ... is written to it with LD R,A. Hence the above will loop ... if the top bit of R is unset or not at ... if the top bit of R is set.

    ...
    Philip Kendall Philip Kendall October 2004 Development
  • 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…

    Well it seems Woody is hottest. The ISR loads R with FFh.

    [code]

    ei
    push af
    ld a,ffh
    ld r,a
    pop af
    reti

    [/code]

    Derek
    dmsmith dmsmith October 2004 Development
  • Determining 50hz/60hz in softwareHow can you determine in software if you are running at 50hz or 60hz?

    ... />
    [code]
    XOR A
    LD R,A
    HALT ; sync timing
    LOOP JR LOOP
    BACK LD A,R ...
    Dr BEEP Dr BEEP March 2006 Development
  • Determining 50hz/60hz in softwareHow can you determine in software if you are running at 50hz or 60hz?

    ... actually work... but imho XOR A; LD R,A should be placed _after_ HALT ... HALT take). Of course R is not a full 16-bit counter ... models might actually give different R "modulos".
    baze baze April 2006 Development
  • The New SPIN releases ThreadOk, as I'm now working on SPIN again full-time, and as a very wise man once said, "Release Early, Release Often"[1]... I'm going to release new SPIN…

    ...
    Multiple image displacements gives a nice scrolling effect though, and ... after switching on, but executing a LD R,A after 14322 cycles followed by ... every 224 cycles, adjusting R when necessary for each new ... (b0-b4 in R) to enact a shift for any/all ...
    Woody Woody July 2006 Emulators
  • Atic Atac speed.Dear all, Excuse the noob question, but does anyone know how fast Atic Atac runs at? What I mean is, frames per second, or the amount of pixels the…

    ... />
    ld a,0x80 ; flag the interrupt
    ld r,a

    ld a,(SpeedFlag) ; increase ... timer
    inc a
    ld (SpeedFlag),a
    frobush frobush January 2009 Games
  • Atic Atac speed.Dear all, Excuse the noob question, but does anyone know how fast Atic Atac runs at? What I mean is, frames per second, or the amount of pixels the…

    ... /> [QUOTE=Arjun;327444]The *what*??? R register?

    * ... keep writing a fixed value to the R register (e ... .g.

    [code]
    DI
    LD A ... , 10
    loop:
    LD R, A
    JR loop ...
    BloodBaz BloodBaz January 2009 Games
  • Atic Atac speed.Dear all, Excuse the noob question, but does anyone know how fast Atic Atac runs at? What I mean is, frames per second, or the amount of pixels the…

    ... of the R register? I thought the R register went ... is manually set with a [b]ld r,a[/b] in which case ... can be used as a boolean flag by the ... br />
    There was a discussion about this over on ... b]ld a,0x80 : ld r,a[/b] at one point, and [b]xor a : ld r,a[/b ...
    Digital Prawn Digital Prawn January 2009 Games
  • Atic Atac speed.Dear all, Excuse the noob question, but does anyone know how fast Atic Atac runs at? What I mean is, frames per second, or the amount of pixels the…

    ... is manually set with a [b]ld r,a[/b] in which ... can be used as a boolean flag by the ... ?
    (I guess a quick load up of [ ... ]ld a,0x80 : ld r,a[/b] at one point, and [b]xor a : ld r,a[/ ... =frobush;327628]... And because LD A,R automatically sets the FLAG Register ...
    BloodBaz BloodBaz January 2009 Games
  • Interrupts - been a while !Not sure if this is the right place for this (1st post on WOS, but been a speccy user since Dec'84 :-o (yes I am that old ! :p) ), But I can't for …

    ... />
    ld a,0x80 ; flag the interrupt
    ld r,a

    ld a,(SpeedFlag) ; increase ... timer
    inc a
    ld (SpeedFlag),a
    frobush frobush March 2009 Sinclair Miscellaneous
  • Interrupts - been a while !Not sure if this is the right place for this (1st post on WOS, but been a speccy user since Dec'84 :-o (yes I am that old ! :p) ), But I can't for …

    ... />
    [CODE] ld a,0x80 ; flag the interrupt
    ld r,a[/CODE]

    evilpaul evilpaul March 2009 Sinclair Miscellaneous
  • Interrupts - been a while !Not sure if this is the right place for this (1st post on WOS, but been a speccy user since Dec'84 :-o (yes I am that old ! :p) ), But I can't for …

    ... />
    [CODE] ld a,0x80 ; flag the interrupt
    ld r,a[/CODE]

    a flag. It never changes once ... for interrupty things!

    LD A,R ; auto triggers the negative/positive ...
    frobush frobush March 2009 Sinclair Miscellaneous
  • Quadrax - Compatibility problems - help!I bought this game last month and when I tried to load it today...it crashes in my +2A!!! Sh*t!! the game was expensive to get, and now I can't play …

    ... />
    _loadbasic ld ix,23755
    ld de,855
    ld a,255

    ld a,#6c-1
    ld r,a
    jp #7d60
    Bob Stains Bob Stains July 2009 Games
  • When would you use LD A,R ?Can anyone tell me a practical use of LD A,R and LD R,A I am confused when you would need to use it? Cheers

    [QUOTE=robpearmain;399406]Can anyone tell me a practical use of LD A,R and LD R,A I am confused when you would need to use it?

    Cheers[/QUOTE]

    See speedlock loaders :smile:
    torot torot November 2009 Development
  • When would you use LD A,R ?Can anyone tell me a practical use of LD A,R and LD R,A I am confused when you would need to use it? Cheers

    ... anyone tell me a practical use of LD A,R and LD R,A I am confused ... />
    Interface 1 uses LD A,R as a random number when two or ... /> The ZX80 and ZX81 use LD R,A to directly set the refresh ...
    Geoff Geoff November 2009 Development
  • When would you use LD A,R ?Can anyone tell me a practical use of LD A,R and LD R,A I am confused when you would need to use it? Cheers

    ... />
    ld a,0x80 ; flag the interrupt
    ld r,a

    ld a,(SpeedFlag) ; increase ... timer
    inc a
    ld (SpeedFlag),a
    frobush frobush November 2009 Development
<1234567…34>

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