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<1…15161718192021…34>
  • IN or INKEY ?just curious which is better to use.. I have a menu done.. and use 6/7 to go up down it + space to cycle thru the options (using inkey).. obv. if I w…

    ... stack the logical operator, call RST $28 and then call FP_TO_BC ... 16 bits & strings in ROM
    roko roko October 2011 Sinclair Basic
  • AND,XOR,OR,BIT,RES,SET,CPL,NEG,RLC,RRC,SLA,SRL,RL, RR,SRA for BASICAs this was drifting away from the original INKEY$ thread I thought that I'd create a new one. So here's a routine to provide all of the above mentio…

    ... with PASMO

    ;Rutinas ROM
    STK_TO_BC equ 2307h
    jr z,DoXOR
    rst 8 ;If not, emit a ...
    mcleod_ideafix mcleod_ideafix October 2011 Sinclair Basic
  • FN nesting error?While playing with FN functions that call assembly, I've found something weird. Check out this code: [code]10 DEF FN f(a,b)=a+b 20 PRINT FN f(FN f(…

    ... ]SZX snapshot with patched ROM and BASIC test code[/ ... at the beginning of the ROM spare area, located from ... call FN error in ZX ROM.
    ;(c)2011 ... the workspace and the RST 18h routine for allocating ... SCANNING as in the original ROM code.

    - ...
    mcleod_ideafix mcleod_ideafix October 2011 Sinclair Basic
  • 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…

    ... 't call a ROM routine which uses IX ... />
    rst $20 ;step over +
    rst $20 ;step ... af

    rst $20 ;step over operator
    rst $20 ;step over ,
    Battle Bunny Battle Bunny October 2011 Sinclair Basic
  • Up/Down Left/Right scrollCan anybody give a newbie some pointer to simple one char scrolling by pixel? I've looked at a lot of resources, but as you can imagine, it's all a …

    ... of...basically just replaces the RST 16 command - I won't ... but instead of using the ROM
    ;routine to do all ... of all the crap the ROM does and free to use ... character just like PRINT....or RST 16)
    pop de
    Turkwel Turkwel November 2011 Development
  • 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…

    ... ;582386]...Then I removed the ROM and found the central display ... />
    If you remove the ROM, and if there's not ... . $FF is the opcode for RST $38, which pushes the current ...
    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…

    ... ;582411]If you remove the ROM, and if there's not ... . $FF is the opcode for RST $38, which pushes the current ...
    roko roko November 2011 Hardware
  • Auto generated spritesLooking around for some graphics I came across [url]http://blog.disktree.net/?p=19[/url] , one of several such pages. Need the odd 8x8 UDG or two (…

    ... together and poke into the rom default udg area. It' ... ,2 ;quick routine so using ROM, upper screen
    call ... ;using ROM to display no of key presses
    rst 16
    ld a,2
    rst 16
    xor a
    add a,48
    rst 16
    ld a,(23560 ...
    R-Tape R-Tape December 2011 Development
  • Tool for saving prog op codes in one neat column?[deleted]

    ... ,(IY+1)
    28B6 DF RST 18
    28B7 CD8D2C CALL ... C,A
    28C1 E7 RST 20
    28C2 E5 PUSH ... the routine names in the ROM. It accepts both start and ...
    Battle Bunny Battle Bunny December 2011 Development
  • Creating a new game - AssemblySo... finally I?m studying Assembly Z80... after 36 years. :) Well... it?s sooooooooooooo hard to make a game using Assembly? I bought a book (Spectr…

    ... 't rely on the Spectrum ROM to do the work for ... !". If you do use the ROM please remember to credit Mr ... ! For your first game the RST #10 is quite usefull, combined ...
    Dr BEEP Dr BEEP January 2012 Development
  • Creating a new game - AssemblySo... finally I?m studying Assembly Z80... after 36 years. :) Well... it?s sooooooooooooo hard to make a game using Assembly? I bought a book (Spectr…

    ... ! For your first game the RST #10 is quite usefull, combined ... ) was written using both those ROM routines - as the book I ...
    bobs bobs January 2012 Development
  • M/C mathsHow would I do the equivalent of LET A=B*7 in machine code?

    ... BASIC variable A, using the ROM's calculator, typical steps would ... be stacked prior to a RST $28 by calling $2ab6 STK_STORE ...
    Battle Bunny Battle Bunny January 2012 Development
  • Would anyone be interested in......Hi, I'm wondering if there would be much interest in an expansion card for the speccy that gives a VGA output with enhanced gfx & sound capabilities…

    ... way around most of the ROM like the back of my ... intercept certain portions of the ROM and perform those jobs much ... faster? Think of intercepting the RST $28 opcode for example, to ... which doesn't use the ROM wouldn't lose anything; BASIC ...
    Dunny Dunny January 2012 Hardware
  • Would anyone be interested in......Hi, I'm wondering if there would be much interest in an expansion card for the speccy that gives a VGA output with enhanced gfx & sound capabilities…

    ... intercept certain portions of the ROM and perform those jobs much ... faster? Think of intercepting the RST $28 opcode for example, to ...
    guesser guesser January 2012 Hardware
  • New project: CargandoLeches. Ultraloads with ROMHi This project has started months ago, between decicoder, macleod and me. Uses the best modulation of k7zx (throwing shavings). But this ultraloa…

    ... try it without modified ROM: these models has special ... Here is this modified 48 rom with installation code for ... mode and install this rom to writeprotected 16kB ram ... br /> OUT (23),A
    RST 0

    * [ ... br /> After install is rom usable, but reset jump ...
    velesoft velesoft March 2012 Development
  • using the ROM's FP calculatorIs it possible to use the ROM's FP calculator to evaluate any FP expression in a single sequence of commands without breaking out to stack some other…

    ... possible to use the ROM's FP calculator to ... br /> stack A : stack B : rst $28 : divide : end_calc
    ... stack C : stack D : rst $28 : divide : add : end_calc ... be done in a single "rst $28 ... end_calc" sequence ... C ; stack D
    rst $28
    divide
    ...
    Geoff Geoff March 2012 Development
  • using the ROM's FP calculatorIs it possible to use the ROM's FP calculator to evaluate any FP expression in a single sequence of commands without breaking out to stack some other…

    ... C
    stack D
    rst 28h ; a, b, c, d ... it possible to use the ROM's FP calculator to evaluate ... />
    stack A : stack B : rst $28 : divide : end_calc
    stack ... C : stack D : rst $28 : divide : add : end_calc
    antoniovillena antoniovillena March 2012 Development
  • Is there a ROM modification (48K) for load without typing LOAD""?The target is to play with 48K machines with keyboard broken, or an alternative solution for new clones like Superfo instead of making a new keyboard…

    ... /> ; ( is SUB $E0 in standard ROM )

    LD ($5C74),A ... />
    ;; SA-SPACE
    L0621: RST 30H ; BC-SPACES creates 17 ...
    Dr BEEP Dr BEEP April 2012 Development
  • SPECTRUM command and 48 BASICAs we (almost) all know, when a young Rupert Goodwins redesigned the Sinclair/Investronica ZX Spectrum 128 ROM 0 in late 1985, he kept the SPECTRUM c…

    ... Sinclair/Investronica ZX Spectrum 128 ROM 0 in late 1985[/quote ... three credits in the original ROM. The UK 128 was created ... , USR 0 selects the 48 ROM with paging unlocked.

    ROM revision?[/QUOTE]

    Having the wrong value when calling RST ...
    chev chev May 2012 Sinclair Miscellaneous
  • Internal ROM expansionHas anybody designed a multiple-ROM interface that plugs into the internal ROM socket instead of plugging onto the edge connector? It would be useful…

    ... version of ROM (yes, 3 versions of ROM!). I've ... second table with the appropriate ROM routine:

    [ ... version of Interface 1 ROM is fitted by querying ... 00 07 $11ts
    rst $00 ; 82e3 c7 $0bts ... to call the appropriate ROM routine for the fitted ...
    jp jp May 2012 Hardware
  • question re. STR$ bugCould someone point me to whereabouts in the ROM this goes wrong? [code]PRINT PAPER 5;1;STR$ 234[/code] (Only the "1" prints in cyan.) It's not the m…

    This routine (48 bytes) provides a BASIC replacement for STR$ which fixes those two bugs; use "FN s$(numeric_expression)" instead of "STR$ numeric_expression". I copied the ROM's method used in CIRCLE & DRAW for checking -1
    Battle Bunny Battle Bunny May 2012 Sinclair Basic
  • Would things of been better if the NMI was fixed ?I was just wondering, if the NMI bug was fixed say early on in production, so for instance all issue twos (and late issue ones) and beyond had the "f…

    [QUOTE=RST#08;629286]On the paging ... this, as a more sophisticated ROM (and RAM) paging protocol and ... to be extended. The shadow ROM in the Interface I was ... sold to replace the original ROM.

    The Spectrum 128 ...
    chev chev May 2012 Hardware
  • Would things of been better if the NMI was fixed ?I was just wondering, if the NMI bug was fixed say early on in production, so for instance all issue twos (and late issue ones) and beyond had the "f…

    [QUOTE=RST#08;629194]... changing the JRZ ... worth remembering that the Spectrum ROM is unfinished. The original plan ...
    spider spider May 2012 Hardware
  • Simple explanation of interrupts (in the context of Z80/Speccy)I wondered if somebody on here could explain in simple terms how interrupts work on the Speccy and where interrupts are source from. Are they a natur…

    ... handler, for example, issuing a RST 38h for IM 1 interrupts ... . With the standard non-patched ROM (48K machines), the NMI routine ... access page in their own ROM that offers a suitable NMI ...
    mcleod_ideafix mcleod_ideafix June 2012 Development
  • Simple explanation of interrupts (in the context of Z80/Speccy)I wondered if somebody on here could explain in simple terms how interrupts work on the Speccy and where interrupts are source from. Are they a natur…

    ... handler, for example, issuing a RST 38h for IM 1 interrupts ... . With the standard non-patched ROM (48K machines), the NMI routine ... access page in their own ROM that offers a suitable NMI ...
    takapa takapa June 2012 Development
  • Multi-sized character screen driverFollowing on from the thread on [url=http://www.worldofspectrum.org/forums/showthread.php?t=24618&page=14]character output routines[/url], I've dug o…

    ... .net/Software/Spectrum/Harston]replacement ROM[/url] which has the BBC ... it was slightly slower than RST 16![/QUOTE]Can you remember ...
    Jonathan Harston Jonathan Harston June 2012 Development
  • ESXDOS v0.8.0 released (with NMI Browser)Hello, To celebrate the speccy's 30th birthday, here's the latest version of ESXDOS for DivIDE users. The full changelog is too long to post here, s…

    ... , 0. That will select ROM 0, the editor ROM. However, you may ... of where you are in ROM 1 when you execute the ...
    OUT (C), A
    RST 0
    chev chev June 2012 Announcements
  • ESXDOS v0.8.0 released (with NMI Browser)Hello, To celebrate the speccy's 30th birthday, here's the latest version of ESXDOS for DivIDE users. The full changelog is too long to post here, s…

    ...
    OUT (C), A
    RST 0[/QUOTE]

    But ... then the RST 0 will be trapped by ... will behave sensibly with the ROM traps active. (I seem to ...
    gasman gasman June 2012 Announcements
  • ESXDOS v0.8.0 released (with NMI Browser)Hello, To celebrate the speccy's 30th birthday, here's the latest version of ESXDOS for DivIDE users. The full changelog is too long to post here, s…

    ... =gasman;634880]But then the RST 0 will be trapped by ... will behave sensibly with the ROM traps active. (I seem to ... version of the 128 Editor ROM that avoids the trap locations ...
    chev chev June 2012 Announcements
<1…15161718192021…34>

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