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<1234567…34>
  • Frank N SteinThis is an improved bugfix for [URL="http://www.worldofspectrum.org/infoseekid.cgi?id=0001849"]Frank N Stein[/URL] as discussed recently in [URL="htt…

    ... 114 196
    ; discard unused return address
    org $C472 ; 50290
    ; reset stack pointer at end of ...
    Einar Saukas Einar Saukas May 2011 Infoseek database
  • Address bus contents (i.e. PC) during execution of HALTI'm wondering if anyone can tell me what's placed on the address bus during execution of HALT, beyond the initial M1 cycle. The Z80 user manual state…

    ... what's placed on the address bus during execution of HALT ... are performed are from the return address of the interrupt handler. Firstly ... opcode fetches were of the address of the HALT instruction each ...
    zub zub March 2014 Hardware
  • Random Numbers, USR Return Values & Timing BASICI've been trying out Jon Ritman's random number routine, published in Your Sinclair Aug'87. Apart from a timing comparison I also did a frequency ana…

    ... In both instances the required return to BASIC with a decimal ... :POP HL ;discard $2d2b ;STACK_BC return address
    RET
    [/code ... this particular function) will return that value to the BASIC ... ;" secs":
    BORDER 7: RETURN
    9999 LET t1=FN ...
    Battle Bunny Battle Bunny January 2017 Sinclair Basic
  • ZXCF InterfaceI'm just trying to get an idea for the ZXCF interface, and to me, it looks a much cleaner design compared to divIDE (Of course, that's just my opinio…

    ... ) banks are available in this address range. Setting
    bit ... writes to the 0-16k address range are discarded).
    ... changes and set WP until reset.

    This should ... the OS configuration after the return address is stacked (and can therefore ...
    Alcoholics Anonymous Alcoholics Anonymous April 2006 Hardware
  • Channels and streams - reading dataThe FAQ here - [url]http://www.worldofspectrum.org/faq/reference/48kreference.htm[/url] - seems to be just a touch inaccurate when it comes to readin…

    ... channel output routine should return with carry reset; if you don't ... currently available
    carry reset, zero reset: end-of-file condition
    return address with ED_ERROR ($107f). In such ...
    glancaster glancaster July 2009 Development
  • Spectrum 128K RS232 to PC serial cableIf you have read some of my recent posts then you will know that I am eager to link my Spectrum +3 to a PC. This will be done by wiring a standard PC…

    ...
    ; ------------

    reset xor a,a
    out ... ,space

    ok jr reset

    ; ------------
    ... />

    ; > IX = Return address
    ; >'HL = CRC

    ; > IX = Return address
    ; >'HL = CRC
    ASM ASM November 2010 Hardware
  • Messenger interfaceHave anyone photos, schematic, rom images, documentation, or software for Messenger interface ? [url]http://www.worldofspectrum.org/infoseekid.cgi?i…

    ... in other than a reset or an NMI... Is ... patch ROM beginning at address 0066h). This startup code ... to reflect the new address space (all the snapshot ... as its sole memory address space), retrieves whatever values ... taken, then pushes a return address to the stack, and ...
    mcleod_ideafix mcleod_ideafix January 2013 Hardware
  • Font hack that was used in a lot of early gamesThere was a little hack for changing the fonts on a spectrum and I remember it being used in a couple of old games on the 48k, it was a sort of ye od…

    ... return address on the stack to zero will cause a reset ... (lower screen) output routine address to jump to a RET ... CHANS,111
    The address of PRINT_OUT is 2548; ... it to 2415, which address contains a RET instruction ... the 48k ROM. The address gets restored by the ...
    Battle Bunny Battle Bunny April 2013 Sinclair Basic
  • 128 BASIC-compatible way of loading BASIC as code?On a 48K Speccy (or from 48 BASIC or USR 0 mode on a 128K machine), one can do a silly trick like this: [code];; load a 4000 byte BASIC program ld i…

    ... machine stack including the error return address which varies between models.
    reset for SAVE
    ld ix,22528 ;IX=start address
    return address
    LD A,$ff
    LD (23610),A ;reset error ...
    Battle Bunny Battle Bunny September 2013 Development
  • What would be the simplest tape loading routine?I'm searching for some small assembly snippet I can use to load a (headerless or not) block from tape into RAM I can embed in my C games to load furt…

    ... sa_ld_ret ; stack
    push hl ; return address
    in a, (ula) ; ... /> jr nc, ld_break ; return with carry reset if not found
    jr nc, ld_break ; return with carry reset if not found
    ret z ; return with carry reset if zero
    ...
    chev chev October 2013 Development
  • SE Basic IV Buffy v4.1 source (WIP)I've been doing a major refactor on the SE Basic source and I'd appreciate a code review from anyone who has time to look at it. I've almost certainl…

    ... ; stack
    push hl ; return address
    in a, (ula) ; ... jr nc, ld_break ; return with carry reset if not found
    return with carry reset if not found
    ret z ; return with carry reset if zero
    ...
    chev chev October 2013 Development
  • SE Basic IV Buffy v4.1 source (WIP)I've been doing a major refactor on the SE Basic source and I'd appreciate a code review from anyone who has time to look at it. I've almost certainl…

    ... subroutine
    ex (sp), hl ; return address
    exx ; in HL'
    xor (hl) ; carry reset if positive, set if negative ... /> ret nc ; return if not zero
    and a ; reset carry flag ...
    chev chev October 2013 Development
  • SE Basic IV Buffy v4.1 source (WIP)I've been doing a major refactor on the SE Basic source and I'd appreciate a code review from anyone who has time to look at it. I've almost certainl…

    ... carriage return
    res 7, (iy + _flags) ; reset ... /> jr stk_pntrs ; exit and reset pointers

    ; ... /> ex de, hl ; reset pointers
    ret ; ... br /> pop af ; drop return address
    exx ; alternate register ...
    chev chev October 2013 Development
  • Break into programIs there any way of stopping people using the break option in my software productions so they can list the code.

    ... ,$ff
    LD (23610),A ;reset error code
    LD HL ... a sub-routine then that return address (or addresses, depending upon how ... do a RETURN, otherwise the GOSUB stack should be reset by the ...
    Battle Bunny Battle Bunny October 2013 Sinclair Basic
  • SE Basic IV Buffy v4.1 source (WIP)I've been doing a major refactor on the SE Basic source and I'd appreciate a code review from anyone who has time to look at it. I've almost certainl…

    ... br /> pop bc ; discard return address
    call fp_to_bc ; ... (iy + _err_nr), OK ; reset error
    jr main_2 ; ... br /> jr new_0 ; normal reset
    .endif
    ... af ; discard report-g return address
    jp main_exec ; ...
    chev chev October 2013 Development
  • SE Basic IV Buffy v4.1 source (WIP)I've been doing a major refactor on the SE Basic source and I'd appreciate a code review from anyone who has time to look at it. I've almost certainl…

    ... af ; else drop return address
    rst error ... ld (coords), hl ; reset coords
    res ...
    chev chev November 2013 Development
  • PlusDlite problems with 128K modelsLast year I developed the PlusDlite, and already shipped out a couple of them. Only recently I discovered some problems with 128K models. I remember…

    [QUOTE=velesoft;750301]After reset you can disable +D ... the third point, from address #0000, at which the ... main' ROM at address #0052.
    That address contains a RET ... 004F UNPAGE_HL PUSH HL Stack return address.
    0050 UNPAGE_1 OUT ...
    bverstee bverstee February 2014 Hardware
  • Pentagon floating bus timingI wanted to take a little break from working on the ZXDS UI yesterday, so I added support for Pentagon timing instead, so I can finally enjoy the lik…

    ... ;758079]AFAIR, the tests will reset on most occasions if the ... the lowest bit of the return address. It is also timed to ...
    introspec introspec March 2014 Emulators
  • Function with push and popIm trying to see if I understand push and pop when it comes to using to pass parameters to functions: [code] LD HL,16384 LD A,5 Push AF Ld A…

    ... :

    pop af ; return address
    pop hl ; uint num ... hl = address of terminating 0 in buf
    ; carry reset no ... of digits marked by carry reset
    push af
    reset

    dec ...
    Alcoholics Anonymous Alcoholics Anonymous April 2016 Development
  • Bizarre stuff in Interface 1's shadow ROMAccording to the Complete Shadow ROM disassembly, the function that exits back to the BASIC interpreter after interpreting IF1 commands is this: [co…

    ... .
    05C9 LD HL,+1BF4 Return address to main ROM is
    [/code]

    Look at address 0x05CF. What's the point ... can only BIT a memory address via HL, IX or IY ...
    Winston Winston March 2008 Development
  • 128 ROM paging alternativeWould this work (with the appropriate code in each ROM)? [code] ; 128 rom paging routine ; use rst 28h with call address stored after restart ;;rom…

    ... ; return address

    ex (sp), hl ; call address to hl
    ; return address to ... (sp)

    ld de, back_to_r0 ; address ... in rom1 of the return routine

    chev chev August 2008 Development
  • ISO ROM 128 with TR-DOS 5.05(cz)This is new correct version of ISO ROM for ZX + BETADISK. Some extra basic command is designed specially for use in conmination with TR-DOS 5.05(cz).…

    ... , show only menu:
    AUTO RESET - return to basic (if basic variables ... is bad then use reset)
    HARD RESET - erase all 128kB of ...
    velesoft velesoft April 2010 Sinclair Basic
  • Optimize this: Distance CalculationBased on a taylor series expansion, suggested by NA_TH_AN, I've got this so far, which is far far faster than SQR(X^2+y^2) Formula is: in a right an…

    ... />
    ASM
    POP DE ; RETURN address
    ; First parameter arrives in ... ; B
    PUSH DE ; put RETURN back

    LD C ...
    Gedlion Gedlion April 2012 Development
  • harvard architecture spectrum clone.I got my first +2 before christmas. I'd never given the 128k spectrums much thought, always been a 48k rubber key tradionalist. :smile: I've been me…

    ... in too to store the return address.

    I know there ... scenes by the hardware. Same address could be used for data ...
    Basher Basher January 2014 Hardware
  • Z88DK NOOB cplot INK colorHi I am a complete NOOB with Z88DK, I am trying to draw colored circles. How does ink, paper and border work with Z88DK. I started trying to wo…

    ... XMAX;

    }

    return;
    }

    eof

    POP HL ; HL = return address
    POP DE ; E = y ... )
    PUSH HL ; push return address back to stack

    andydansby andydansby June 2016 Development
  • sdcc inline assembly wtf..So, I'm trying to get division to work. By googling I've found one division algorithm that's quoted in several places, but can't seem to get it to wo…

    ... , the stack first contains the return address, then parameters in left to ... I can call ret, and return value is expected to be ...
    Sol_HSA Sol_HSA September 2016 Development
<1234567…34>

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