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<1234567…34>
  • Learning Assembly LanguageHow easy would it be to learn assembly language for someone who has a decent grasp of Basic? I mean how long do you think it would take before I coul…

    ... interrupts for SP change
    ld (stack+1),sp ; Store SP using self ... hl,bc
    ld sp,hl ; SP now points correctly into LPT ...

    stack ld sp,0 ; Reset SP
    ei ; Must enable interrupts ...
    ASM ASM October 2010 Development
  • Learning Assembly LanguageHow easy would it be to learn assembly language for someone who has a decent grasp of Basic? I mean how long do you think it would take before I coul…

    ... interrupts for SP change
    ld (stack+1),sp ; Store SP using ... hl,bc
    ld sp,hl ; SP now points correctly into ... br />
    stack ld sp,0 ; Reset SP
    ei ; Must enable interrupts ... Still slightly fuzzy about the SP stuff... I get the gist ...
    sekrets sekrets November 2010 Development
  • Learning Assembly LanguageHow easy would it be to learn assembly language for someone who has a decent grasp of Basic? I mean how long do you think it would take before I coul…

    ... interrupts for SP change
    ld (stack+1),sp ; Store SP using self ... hl,bc
    ld sp,hl ; SP now points correctly into LPT ...

    stack ld sp,0 ; Reset SP
    ei ; Must enable interrupts ...
    ASM ASM November 2010 Development
  • Your Views on... GhostbustersI dusted off the Master System version of this and inspired me to try out the Speccy version. It's a good game with it's strong and weak points. I …

    ...
    DJNZ DONE2
    LD SP,$FFFF
    JP $8300 ;fast loader ...
    Jimmy Jimmy May 2011 Games
  • Repairing a faulty 48K issue 2.I am investigating one of a pair of non-working issue 2 48K Spectrums that have been sitting in a cupboard untouched for quite a few years. I haven…

    ... &page=3[/url]) sets SP=$FFFF, so PC is written to ...
    mcleod_ideafix mcleod_ideafix November 2011 Hardware
  • Repairing a faulty 48K issue 2.I am investigating one of a pair of non-working issue 2 48K Spectrums that have been sitting in a cupboard untouched for quite a few years. I haven…

    ... &page=3[/URL]) sets SP=$FFFF, so PC is written to ...
    roko roko November 2011 Hardware
  • ANN: Tipshop updated Saturday, 31 December 2011Saturday 31 December 2011 The last update of the year - Happy New Year when it comes! * GoodBoy sent in a cheat for Wacky Races. * Hippy Smith sen…

    ... !

    start:
    LD SP,$FFFF
    LD IX,$4000
    Jimmy Jimmy January 2012 Announcements
  • Another custom loaderI got into my hands a cassette with compilation of Polish programs. most of them MIA. Unfortunately some of them are saved with a kind of custom loa…

    ... Sonda):

    0xF870 ld sp,ffff
    0xF873 ld ix,4000 ... nz,f870
    0xF8DA ld sp,(5b36)
    0xF8DE pop hl ... jr f87a
    0xF8EE ld sp,(5b36)
    0xF8F2 pop hl ...
    lfaria lfaria February 2012 MIA/STP/SDP
  • Matching calls and returnsHi all, A pretty fundamental question here that I probably should have sorted by now. I've noticed how much the stack has built out in my current g…

    ... of the game (before you reset SP) do you have 30 identical ...
    BloodBaz BloodBaz April 2012 Development
  • Matching calls and returnsHi all, A pretty fundamental question here that I probably should have sorted by now. I've noticed how much the stack has built out in my current g…

    ... of the game (before you reset SP) do you have 30 identical ...
    Sokurah Sokurah April 2012 Development
  • Matching calls and returnsHi all, A pretty fundamental question here that I probably should have sorted by now. I've noticed how much the stack has built out in my current g…

    ... of the game (before you reset SP) do you have 30 identical ...
    R-Tape R-Tape April 2012 Development
  • 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…

    ... also experiment with the Z80 reset signal, see if I can ... down whether AF' is reset to #ffff or whether it's just ...
    zub zub March 2014 Hardware
  • ANN: SP1 for Z88DK (aka splib3, Sprite Pack v3.0)Well it's finally arrived, after a month of "a few days from now" release deadlines. SP1 is the lastest version of splib, a flicker-free software sp…

    ... (a timer that is automatically reset in a loop, so that ... ) LIBRARY DESCRIPTION
    ;
    ; f200 - ffff SP1.LIB horizontal rotation tables ... ------- z80 stack (512 bytes) set SP=d300
    ;
    ; * = variables located ...
    Alcoholics Anonymous Alcoholics Anonymous May 2006 Development
  • Jetpac questionHi all, I just bought a copy of Jetpac off of Ebay and I'm having problems. To start, I'm trying to play it on an issue 2 Speccy with Interface 1, 2 …

    ... Disable Interrupts

    LD SP,MyStack ; Move stack to screen ... MEASURE_FAIL
    LD (HL),0 ; Reset the byte to zero
    StartPass
    LD HL,0 ; Reset Failed Addr
    LD (FailedAddr ... /> DW $5555
    DW $FFFF
    DW $0000 ; Have this ...
    Digital Prawn Digital Prawn January 2009 Games
  • +3 how to detect if a file exist ?Need help. I am making a generic menu to my compilations over the spectrum +3. Exist some way programatically to detect if some file exists on the d…

    ... and RAM 7 to $C000-$FFFF
    48896 DI ;While ... )
    48897 LD (36864),SP ;Store the BASIC stack pointer ... )
    48950 AND %11111000 ;Reset the last three bits. (for ... the stack.
    48958 LD SP,(36864) ;And restore the ...
    spodula spodula May 2010 Sinclair Basic
  • 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,…

    ... values: all registers set to $FFFF. SP set to $6003, sometimes ... proper (maybe short enough) reset pulse, registers values are preserved ... are commonly preserved through a reset operation. Note that sometimes ... after a warm reset (using the reset button with the ...
    mcleod_ideafix mcleod_ideafix May 2011 Emulators
  • Interface 1bis updateSupport for connecting a standard PC keyboard to the interface?s PS/2 socket, in place of a mouse, has been added. The external keyboard?s output is …

    ... MAIN_E
    ; *
    ; Reset the Carry flag for LOAD ... : 11ffff EXT_KB LD DE,#FFFF
    388d : cd7a38 ... /> 3894 : e3 EX (SP),HL; address
    3895 ...
    Dan Antohi Dan Antohi April 2014 Hardware
  • Interface 1bis updateSupport for connecting a standard PC keyboard to the interface?s PS/2 socket, in place of a mouse, has been added. The external keyboard?s output is …

    ... MAIN_E
    ; *
    ; Reset the Carry flag for LOAD ... : 11ffff EXT_KB LD DE,#FFFF
    3887 : cd7438 ... /> 388e : e3 EX (SP),HL; address
    388f ...
    Dan Antohi Dan Antohi April 2014 Hardware
  • A few questions about sound and keys in BASICIf I want sound in my BASIC game I have to use BEEP right ? It seems to lock up the CPU for far too long . On Arjun's page I found how to use CALL 94…

    ... />
    . The Zero flag is reset if pressing more than two ... pressing no key, then DE=$ffff.

    The key codes ... 00100010 EN 21 33 00100001 SP 20 32 00100000
    [/code ...
    Battle Bunny Battle Bunny December 2016 Sinclair Basic
  • SPIN Public Beta 0.1b Available for downloadHi all, back again, and as just recently announced on CSS, SPIN has been updated. Here's the post to CSS (or the relevant parts): It's been a bu…

    ... Snapshot saving in 48k mode (SP pointer bug), and a related ... +3 code

    Changed Reset Icon to a power icon ...
    Dunny Dunny May 2002 Emulators
  • InterruptsA small piece intended for the FAQ. Comments, corrections, additions welcome. Notably: * How long does the 48K ULA hold /INT low? * What happens i…

    ... : acknowledge the interrupt and decrement SP.
    * M2: 3 ... tstates: acknowledge interrupt and decrement SP.
    * M2: 3 ... tstates: acknowledge interrupt and decrement SP.
    * M2: 3 ... was zero (thus causing a reset). However various peripherals, most ...
    Philip Kendall Philip Kendall July 2004 Development
  • Smooth Screen Scrolling RoutineHi everyone, this is a follow up to the thread on smooth screen scrolling. As promised here is the code for the routine. It's pretty long and fairl…

    ...
    LD (SPMOD+1),SP ;preserve stack pointer
    < ... br />
    LD SP,HL
    EX DE,HL ... br />
    PUTBLOCK LD SP,HL
    EX DE,HL ...
    LD A,E ;reset the horizontal screen
    AND ... />
    SPMOD LD SP,0 ;restore stack pointer
    dmsmith dmsmith September 2004 Development
  • Announce: EmuZWin 2.5 Release 2.2 Post-FinalEmuZWin Version 2.5 Release 2.2 post-FINAL (16-Oct-2004): [-] A small pause added between TAP blocks while loading tape from .TAP image (otherwise s…

    ... emulated prog uses mouse and reset Spectrum by itself (e.g ... in the catalog did not reset video page to 0. Fixed ... load and save .ZX and .SP snapshots.
    [*] Sprite Finder made ...
    Vladimir Kladov Vladimir Kladov October 2004 Emulators
  • BASin Release 13 is now availableI'm still at it. BASin is now in it's 13th incarnation (disregarding the inter-version updates) and is now available at [url="http://homepage.ntlw…

    ... are, but not after a reset. (Necros)
    Fixed - PRINT statements ... RAM Disk when they triggered - SP was being corrupted.
    Fixed ...
    Dunny Dunny January 2006 Emulators
  • BASin Release 13 is now available[unashamedly x-posted from Emulators forum] I'm still at it. BASin is now in it's 13th incarnation (disregarding the inter-version updates) and is …

    ... are, but not after a reset. (Necros)
    Fixed - PRINT statements ... RAM Disk when they triggered - SP was being corrupted.
    Fixed ...
    Dunny Dunny January 2006 Sinclair Basic
  • What happens during a reset?I always used to wonder about this, but only thought a bit more about it last night when noticing after all these years what actually happens. Obvio…

    ... what is happening during a reset: the entire RAM is set ... from address 65535 downwards, then reset to 0 upwards from 16384 ...
    Gwyn Gwyn February 2006 Sinclair Miscellaneous
  • Spectrum ResetHi All I have asked this before but in another thread as part of something else. I really cannot recall all this stuff from way back :[ When I ha…

    ... what is the process to reset the
    Spectrum other than ...
    Chris A Chris A December 2006 Sinclair Miscellaneous
  • 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 …

    ... ; copy

    ; simulate cold reset

    rst 0h ;
    dec sp ; $1900
    dec sp ; $1901
    jp $2bb1 ...
    chev chev March 2007 Emulators
<1234567…34>

Latest Posts

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