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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…

    ... due to stack overflow as the machine stack eventually gets ... (less serious) cases of stack overflow can all be fixed ... by simply resetting the stack pointer at the end ... ; 195 121 196
    ; reset stack pointer at end of level ...
    Einar Saukas Einar Saukas May 2011 Infoseek database
  • 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…

    ... dec a ;A =$ff, Carry reset for SAVE
    ld ix ... ;(ERR_SP)
    ld sp,hl ;reset stack

    ld hl,$1b9e ... )
    MCCONT: push hl ;stack ROM return address
    LD ...
    Battle Bunny Battle Bunny September 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…

    ... ; hexadecimal
    defw x80_frstk ; re-stack
    defw x80_fsgen ; series generator ... number
    ld (stkend), de ; reset stack end
    ret ; end of ... :
    push de ; stack stack end
    push hl ; stack pointer to number ...
    chev chev October 2013 Development
  • tiny routine to shift RAMTOP & stackCompressing some data areas above RAMTOP and wanting to make the released space available for BASIC arrays, I needed to move RAMTOP without using CLE…

    ... still reference the m/c stack at the old location, so ... preserved, but the GOSUB stack still gets reset, as it just uses ... enhanced to preserve the GOSUB stack as well, but then it ...
    Battle Bunny Battle Bunny November 2011 Sinclair Basic
  • recovering the stack after an errorMy normal error handler starts with the stack as reset by LD SP,(ERR_SP) in $0053 ERROR_2, sets up some stuff and returns to BASIC via a "JP C,$1e73 …

    ... error handler starts with the stack as reset by LD SP,(ERR_SP ... , I search back through the stack to find the error code ... $0058 and my routine the stack history gets overwritten by the ... SP,(ERR_SP) to protect the stack until I've dealt with ...
    Battle Bunny Battle Bunny October 2012 Development
  • Solution for overwritten stack in 48k SNA filesIt has been known for quite some time now that the 48k SNA file format has one serious fault, which is described in the file formats section on the W…

    ... is pushed onto a stack before a snapshot is ... is possible that the stack is full when an emulator ... storing PC on the stack sometimes overwrites a graphics ... and pushing PC onto a stack, my emulator copies the ... program counter from the stack and then it copies ...
    Anonymous Anonymous October 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…

    ... P/V flag is reset, even if interrupts were ... the EI, it will be reset.

    When ... reset and the current value of PC is placed on the stack ... is accepted, IFF1 is reset, but IFF2 is left ... 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


    SCRMODA ...

    LD A,E ;reset the horizontal screen
    AND ... /> SPMOD LD SP,0 ;restore stack pointer

    EI
    dmsmith dmsmith September 2004 Development
  • 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
  • Stack Up - level 13: anyone want a challenge?okay I swear this level is not humanly possible. if anyone doesn't know Stack-Up it's a simple Tetris type game - match 3 blocks of the same colour i…

    ... . if anyone doesn't know Stack-Up it's a simple ...
    def chris def chris September 2007 Games
  • About the edge connector (reset and comp video)Recently aquired a Kempston type interface for my rubber keyed 48K. Ive been wanting to add a composite video out and it just occured to me i might …

    ... would like to add a reset button in the same manner ...
    spider spider October 2007 Hardware
  • It's a trap!So I got a CPLD (not the eventual one I want to use for the ethernet project - rather, one I actually have here and now, an XC9536 in a PLCC44). And…

    ...

    - 0x0000 - only when RESET has been asserted. (All executions ... of 0x0000 without a reset result in no trap).
    stack, so code such as:
    Winston Winston December 2007 Hardware
  • MB02+ software and system developmentsThe following text was (before last modification) first published here: [url]http://www.sintech-shop.com/forum/board.php?boardid=20[/url] As discuss…

    ... have the possibility to temporarily stack software as a snapshot into ... selecting the boot device after RESET by pressing a button. So ...
    ingo ingo March 2008 Development
  • Spectrum + Reset SwitchI've picked up a Spectrum + that doesn't have a reset switch fitted. Any recommendations / part number for a modern alternative? Cheers

    I've picked up a Spectrum + that doesn't have a reset switch fitted.
    Any recommendations / part number for a modern alternative?

    Cheers
    jp jp May 2008 Hardware
  • So you want to make a cardgame......but you haven't got a good deck to display. Well here is a fully relocatable routine that will do the job for you. Place the code anywhere in me…

    ... CALL #2BF1 ; fetch value from stack
    EX DE,HL
    LD (23606),HL ; reset old charset
    RET ; back ...
    Dr BEEP Dr BEEP December 2008 Development
  • Questions about registers, stack, etc.I was told that if I wanted to export code and create unprotected versions of games I should do the following: 1-Find the starting address by using …

    ... -Make a note of registers/stack
    5-Create a small ...
    zxbruno zxbruno January 2009 Sinclair Miscellaneous
  • Understanding the StackSorry folks. I guess I'm going to be a pain for a little while. Hope it's ok with everyone. I'm currently studying the stack and wrote the little pr…

    ... /> I'm currently studying the stack and wrote the little program ... memory viewer to inspect the stack contents and pointer location.
    stack being essentially a stack (duh!) of 16 ...
    rahtgaz rahtgaz January 2009 Development
  • Screen display at resetJust something for curiosity: When the Spectrum is reseted by for example NEW a very typical screen is shortly displayed. [IMG]http://i33.tinypic.c…

    ... some temporary "malfunction" during the reset that makes this happen?
    Rickard Rickard September 2009 Development
  • Composite video and reset buttonOK, I've got some Kempston clone interface here, and I've added a phono socket and a small momentary switch to it (ages ago but forgot about it) . :)…

    ... connector

    Wire reset to reset signal on edge connector.
    reset, is it just the what ... I'd guess (reset pin on one side of ...
    spider spider November 2009 Hardware
  • Converting games from tap to dskHi to all from Greece, Being an old Speccy user and now owner of most models of Spectrum (48k , 48k+ , 128K, +2 grey and +3) , I desided to salvage m…

    ... the basic stack gets corrupted and you get a nice reset in ...
    batsilos batsilos January 2010 Emulators
  • Defenda (Interstella) makes resetDefenda from Interstella makes a reset if I take No. 1 Kempston joystick. My jockstick interface is from Ram Electronics (Fleet) Ltd. Joystick is a C…

    Defenda from Interstella makes a reset if I take No. 1 ...
    -Micky -Micky January 2010 Games
  • Which reset method on ZX 48K?What reset method is correct on issue 3b ZX 48K: One wire to R68 and one to C27 (Manual from ZX Spectrum +) or One wire to Pin 26 from CPU and one …

    What reset method is correct on issue 3b ZX 48K:

    One wire to R68 and one to C27 (Manual from ZX Spectrum +) or

    One wire to Pin 26 from CPU and one to GND


    Micky
    -Micky -Micky February 2010 Hardware
  • Adding a reset switch to a 48K?I've done this before but can't for the life of me remember which line to pull to ground! I tried /NMI which does reset the machine when it's in bas…

    ... /> I tried /NMI which does reset the machine when it's ... running. Would it be the /RESET line?

    TIA
    elshiftos elshiftos March 2011 Hardware
  • Locating the GOSUB stackI was wondering if someone could explain how to locate the dividing line between the GOSUB stack and the machine stack. Looking at the GOSUB routine …

    ... line between the GOSUB stack and the machine stack. Looking at the ... make entries on the GOSUB stack, but I can't see ...
    Battle Bunny Battle Bunny May 2011 Development
  • 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,…

    ... a power cycle (not RESET) and without any interface ... If I do a CPU reset (on a Plus), or ... until the CPU meets the stack, and then it interprets ... .
    But AFAIK, the stack contains the same values after ... cycle, or because the RESET button has been pressed. ...
    mcleod_ideafix mcleod_ideafix May 2011 Emulators
  • Kiwi OS for z80 computerHi everyone, Nearly made my z80 computer with 2K ROM 32K RAM. It has an OS im still writing called Kiwi (apple, blackberry, you get the idea ;D) he…

    ... HL, 32800 ;LOAD HL WITH STACK POINT LOCATION
    LD SP ... , HL ;SET STACK POINTER TO HL
    LD ... , $2A ;LOAD A WITH RESET SDA RESET SCLW RITE MODE (00101010) < ... $ 26 ;LOAD A WITH RESET SDA RESET SCL READ MODE (00100110)
    Robin Robin August 2011 Announcements
  • Tile based graphics and scrolling thingy...Here's my best attempt so far at a tile based rendering and scrolling routine. It draws in 22 8*8 graphics tiles along the top of the screen (junk i…

    ... ,16385
    ld (position_var),hl ; Reset print position

    ret ... />
    ld (32859),sp ; Preserve stack pointer

    ld sp ...
    Zoltar Zoltar September 2011 Development
  • AND,XOR,OR,BIT,RES,SET,CPL,NEG,RLC,RRC,SLA,SRL,RL, RR,SRA for BASICAs this was drifting away from the original INKEY$ thread I thought that I'd create a new one. So here's a routine to provide all of the above mentio…

    ... zero if the bit is reset and non-zero if it ... ;step over ,
    call EX1NUM ;stack 1st variable
    pop af ... ;step over ,
    call EX1NUM ;stack 2nd variable
    call FPTOBC ...
    Battle Bunny Battle Bunny October 2011 Sinclair Basic
<1234567…34>

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