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<1234567…34>
  • 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 below to ... inspecting the registers and looking at the memory viewer to inspect the stack contents ... despite the stack being essentially a stack (duh!) of 16-bit elements, the pointer ...
    rahtgaz rahtgaz January 2009 Development
  • 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 ... I search back through the stack to find the error code, restore SP ... and my routine the stack history gets overwritten by the interrupt routine and ... SP,(ERR_SP) to protect the stack until I've dealt with ...
    Battle Bunny Battle Bunny October 2012 Development
  • Where do you stick the stack?...OK, so I've got a fair chunk of ASM code assembled from 24000 mark. The stack shouldn't get very big, just a few PUSHes and POPs of the main regis…

    ... assembled from 24000 mark. The stack shouldn't get very big ... PUSHes and POPs of the main registers, so it ... was sitting right at the top of RAM while ... was trying to write the code. But I forgot ... couple of the game disassemblies over in the announcements thread ...
    Morkin Morkin July 2013 Development
  • Using the stack to blit bufferI was using a ldir to blit my back buffer to the screen RAM, and it was working pretty well if not rather slow. After reading about using the stack …

    ... />
    After reading about using the stack to push and pop stuff ... getting a 'ghosting' effect where the sprite appears at both ends ... of the line sometimes.

    ... wide lines from memory to the screen.

    Can anybody ...
    Atari_Jetman Atari_Jetman February 2014 Development
  • Stack 100 Light Pen "not available for the Spectrum"I notice that WoS has the "Stack 100 Light Pen" in the archive, but according to the companies own advert, it is not available for the Spectrum: [ur…

    ... the "Stack 100 Light Pen" in the archive, but according to the ... it is not available for the Spectrum:

    ...
    ([i]click on the advert, and it is stated ... underneath the product name at the top[/i])< ... because I have a Stack 100 Light Pen, and ...
    spec-e spec-e May 2013 Infoseek database
  • I think my stack is in the wrong placeHi Im using SDCC and my game crashes for no apparent reason in the compilation arguments I put --stack-loc 60000 but im printing SP to the screen and…

    ... reason
    in the compilation arguments I put --stack-loc 60000
    but im printing SP to the screen ... :24969
    SP is the location of the stack right?

    I ... there a way of getting the stack location using an emulator?
    slenkar slenkar February 2015 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…

    ... It is possible that the stack is full when an emulator ... in which storing PC on the stack sometimes overwrites a graphics buffer ... a stack, my emulator copies the content of the top of the stack (2 ... and memory, pops the program counter from the stack and then it ...
    Anonymous Anonymous October 2002 Emulators
  • BASin r14d - Final bugfix for the r14 seriesOk, there's not a great deal to "show" here, as most of the work has been going on "under the hood" so to speak. And there's been a [i]lot[/i] of wor…

    ... would not properly reflect the state the emulation was in, ... today: "Don't fuck with the stack pointer". (Jimmy)
    Fixed ... showing the wrong number for the keywords.
    Fixed - The editor ... . (Jimmy)
    Fixed - The SPECTRUM command will terminate your ...
    Dunny Dunny December 2008 Emulators
  • Using the stack to copy memory blocksA [b]PUSH[/b] and a [b]POP[/b] instruction together take less time than two [b]LDI[/b], so long [b]POP/PUSH[/b] sequences are sometimes used to copy …

    ...
    ; Compare the bailout value with the MSB of the destination address.

    The nearest equivalent using LDI is ... .[/code]

    The speed advantage of using [b ... It derives from eliminating the overhead of using a ...
    ajmoss ajmoss August 2010 Development
  • clear a windowed area of the screenHi everyone! Ain't been on here for donkeys, but have recently started messing around with a little game. I'm looking for ideas/opinions on the bes…

    ... looking for ideas/opinions on the best way to clear a ... window on the screen RAM.

    My ... attempt at a game used the stack, but the code took up a ... a 25x24 char section of the screen.

    Any suggestions ...
    Atari_Jetman Atari_Jetman October 2014 Development
  • The Spectrum Show 44Episode 44 now live. This includes a review of the Stack Light Rifle. [url="https://youtu.be/oBtaqGaGrmU"]View here.[/url]

    Episode 44 now live. This includes a review of the Stack Light Rifle.
    [url="https://youtu.be/oBtaqGaGrmU"]View here.[/url]
    Paul-J Paul-J September 2015 Announcements
  • Reverse engineering "Stack Light Rifle"Hello I would like to reverse engineer the electronics inside the connector in the "Stack Light Rifle" to build adapters which can be used with mo…

    ... to reverse engineer the electronics inside the connector in the "Stack Light Rifle" to ... a picture be posted of the contents inside the connector?
    Boojakascha Boojakascha June 2017 Hardware Preservation
  • Custom Menus on the ZX Spectrum +3Today, my Friends, i have the pleasure of presenting a program i have written which gives a set of custom menus on the +3. The main features of my p…

    ... interesting; this is the option that enables the Calculator within the Editor. However ... things like the value held on the Stack (pointed to by the ERR_SP system ... with the ability to use the Calculator withing the Editor, and with the already ...
    The_Bert The_Bert October 2017 Sinclair Basic
  • 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…

    ... code to move the top of the z80's stack to 54016. You ... the suggested location of the stack in the memory map listed at the end of the ... to do the same :-P) the code at 0x38 will be poking values ... file as mentioned above) has the stack as low as address $d200 ...
    Alcoholics Anonymous Alcoholics Anonymous April 2006 Development
  • Project: M.u.l.e.Wokani came up with a great idea about trying an open-development approach for spectrum games, and I thought why not try with a game I have under dev…

    ... effectively poking 30000 into address 23606/23607, thus changing the location of the ... those variables are popped off the stack and are no longer valid ... width, we'll actually be poking 16 values -- a left and ...
    Alcoholics Anonymous Alcoholics Anonymous June 2007 Development
  • Project: M.u.l.e.Wokani came up with a great idea about trying an open-development approach for spectrum games, and I thought why not try with a game I have under dev…

    ... ]

    You would be poking the 2-byte value 30000 to ... the stack (compare to the standard way where the caller must clear the parameter from the stack ... on the stack while a function runs is called the stack frame. In z88dk the stack ...
    Alcoholics Anonymous Alcoholics Anonymous July 2007 Development
  • Paging MemoryAny idea why this short piece of code doesnt work, just crashes. I am just messing with paging memory in and out (not achived this yet) and reading t…

    ... in 128K Basic and not poking the system variable ($5b5c) that tells ... /> 2) you're paging out the stack - you want to do a ...
    gasman gasman September 2007 Development
  • Transferring games into MicrodriveLast week a big pack of empty microdrive cartridges arrived, and now I'm ready to playing with my little microdrive equipped speccy. One of my aim w…

    ... fall from the sky at the start of the game. The title page ... file and found the 17 BYTE difference as expected. Poking those 17 ... BYTES into a copy of the .SNA file allowed the ... my small program on the stack that is causing the problem.

    ASM ASM November 2010 Sinclair Miscellaneous
  • 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,…

    ... possibly, the effect relies on the USR call itself putting the machine into ... very specific moment and modifying the stack just as it's ... could test this theory by poking the free space above 46578 ... 'd expect the emulator to be the one with the reproducible time ...
    gasman gasman May 2011 Emulators
  • Snapshots (SNA) -> Keeping the loading screen?I've seen quite a few Snapshots (SNA) that kind of hesitate on the loading screen prior to entering the game menu... I quite like this. Anyone know …

    ... z80user is suggesting is poking into the Snap file format ... bytes used for preserving the stack and registar state, and ... those address bytes in the stack, then the emulators automatic execution of ... the RET instruction will execute the code from ...
    kgmcneil kgmcneil April 2012 Emulators
  • How to change the colour of an input line?Hello my fellow WoS'ers I remember the way-back machine on the humble 48k where I could write a REM statement in basic, but I could also change the …

    ... to the BASIC program. Unfortunately switching modes resets the address on the stack to ... point to the default "on ... routine is ignored. I tried poking the JP exit from ONERR to ...
    Battle Bunny Battle Bunny July 2012 Sinclair Basic
  • How to change the colour of an input line?Hello my fellow WoS'ers I remember the way-back machine on the humble 48k where I could write a REM statement in basic, but I could also change the …

    ... switching modes resets the address on the stack to point to the default "on ... routine is ignored. I tried poking the JP exit from ONERR to ... and modify it, storing the address on the stack somewere and restore it ...
    Encarnado Encarnado July 2012 Sinclair Basic
  • Copying data between memory banks in USR0 modeI am experimenting with Funky Fungus to load the majority of its data (levels, screens, music etc.) into memory banks 1, 3, 4, 6 and (partly) 7 by sw…

    ... selecting a bank by poking. That isn't ... also needs to contain the information about which ROM ... Now CLEAR 49151. This moves the stack below paged RAM.
    ... /> LD DE, 16384 ; the destination address
    LD ... you need to maintain the system variables then you ...
    chev chev September 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.

    ... from BASIC, save the address from the stack in the location pointed to by ... (ERR_SP) and replace it with the ... -evaluate (ERR_SP) before poking the machine stack.

    * If the error trap is ...
    Battle Bunny Battle Bunny October 2013 Sinclair Basic
  • Basic Screen Shadow QuestionHello, I've been porting a game to the Spectrum from another platform. So far so good and I have per pixel screen scrolling working really nicely …

    ... pain. As long as the stack and interrupt routine is above ... because the the way Spectrum BASIC uses decimal for addressing / poking / peeking ... etc, that was the way address ... later and noticed that the address was wrong (then ...
    MatGubbins MatGubbins August 2016 Development
  • URGENT programming question !I've gotta draw a line from machine code using the standard routine at 24B7, which expects the delta-X and delta-Y values on the BASIC stack. I put t…

    ... line from machine code using the standard routine at 24B7, which ... values on the BASIC stack. I put these values in the stack by calling ... 2D2B (BC -> BASIC stack). However, it ... put a negative BC on the BASIC stack ?
    GOC GOC July 2003 Sinclair Miscellaneous
  • InterruptsA small piece intended for the FAQ. Comments, corrections, additions welcome. Notably: * How long does the 48K ULA hold /INT low? * What happens i…

    ... of PC is placed on the stack.

    What happens next ... : 3 tstates: write the low byte onto the stack and to set PC ... high byte of PC to the stack and decrement SP.
    * M5 ... of PC is placed on the stack, and PC is set to ...
    Philip Kendall Philip Kendall July 2004 Development
<1234567…34>

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