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<1…20212223242526…34>
  • 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
  • BUG in zxspin and SpecEmu - read Loading speed in WAV fileI'm created a new save, but it can run at 44.1 KHz, to test it, i make a new file from WAV 44.1 KHz to 88.2 KHz. Load this file in a emulator zx-spin…

    ... high

    The original rom of Spectrum (48 KB model ...
    jr c, l_801e ; 8022 38 fa $0c/$07ts
    push ...
    Z80user Z80user March 2012 Emulators
  • 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
  • number padding functionI wrote a number padding function in BASIC a while ago, but when I came to want it again I couldn't find it, so I've done this enhanced [url=http://w…

    ...
    call $33b4 ;STACK_NUM
    rst $28 ;FP_CALC
    defb $2e ... ;str$
    defb $38 ;end_calc
    call $2bf1 ;STK_FETCH ...
    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
  • Machine Code Routine of the weekHow about a thread that has a routine each week that is in [B]assembly language[/B] and is also described in great detail what the hell is going on …

    ... of the places in the ROM print routine where a screen ... C, L_0BD3 >*8 ;.0BBE 38 13 *delete
    BIT 1 ...
    Battle Bunny Battle Bunny June 2012 Development
  • Machine Code Routine of the weekHow about a thread that has a routine each week that is in [B]assembly language[/B] and is also described in great detail what the hell is going on …

    ... of the places in the ROM print routine where a screen ... C, L_0BD3 >*8 ;.0BBE 38 13 *delete
    BIT 1 ...
    Paddy Coleman Paddy Coleman June 2012 Development
  • Ear + Mic bits behaviour in relation to beeper outputHave just read [url=http://www.worldofspectrum.org/forums/showpost.php?p=348953&postcount=38]this old post of Joefish's [/url] in the development for…

    ... .php?p=348953&postcount=38]this old post of Joefish ... you can't hear the ROM saving routine.

    Hope ...
    Jon Needle Jon Needle June 2012 Emulators
  • 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
  • ROM POKE-able emulatorIs there an emulator available where you can POKE the ROM (and also altering it) while running? Thereby making the ROM work like RAM. Preferably a…

    ... a ZX Spectrum (when ROM was programmed or replaced with ... another ROM).

    The ... I am recoding the ROM so it can run ... needed an altered ROM to intercept a RST 8 as shortcut ... the setting of channels with RST #10 and this can ...
    Dr BEEP Dr BEEP June 2012 Emulators
  • Help needed... RND in machine codeI have been battling away trying to convert a simple BASIC routine (below) to machine code, but to no avail. The routine is used to fire 2 bullets a…

    ... = calculator code for VAL
    rst $28 ;FP_CALC
    defb $34 ... ))*5-1

    defb $38 ;end_calc
    call $2da2 ;FP_TO_BC ...
    Battle Bunny Battle Bunny July 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…

    ... some syscall to call zx rom and he replied me, ... address of routine in zx rom.

    i ... br /> ld ($5c5d),hl
    rst $18
    dw $24fb ; ... in the 128 editor ROM is fully disassembled and ...
    ub880d ub880d July 2012 Announcements
  • 64x48 full colour graphicsHow feasible is this? Could an interrupt-driven routine be used to, for example, fill the top two thirds with a 64x32 blocky picture and leave the bo…

    ... byte 0 which is in ROM and has value 243
    MV6 LD HL,37*256+38 ;HL'
    MV5 LD DE ...
    Ralf Ralf July 2012 Development
  • Messenger interfaceHave anyone photos, schematic, rom images, documentation, or software for Messenger interface ? [url]http://www.worldofspectrum.org/infoseekid.cgi?i…

    ... "void", which means reading FFh (RST 38h). If address 0038h doesn ... be active, disabling the internal ROM, but if this happens, EPROM ... and RAM_CS are high. Internal ROM is therefore active. This explains ...
    mcleod_ideafix mcleod_ideafix August 2012 Hardware
  • 40 Column Printing RoutineI've written a 40 column printing routine, which I'd like to share... It's my first piece of 'public' code so go easy on me! I don't think it is a…

    ... br /> defb 0,28,38,42,44,32,34, ... defb 0,28,34,32,38,34,38,26
    defb ... 0,34,50,42,42,38,34,34
    ...

    ;*********************************************************************************
    ; the RST $10 replacement routine
    ; accepts ...
    uglifruit uglifruit August 2012 Development
  • PRINT a numerical value i.e. the scoreHow do you fo about printing a numerical value using the print routine in the ROM? For instance I have a value 0-255 and want to PRINT the result at…

    Using ROM go with something like..
    rst 16
    ld a, ... 7 ;white paper
    rst 16
    ld a, ... 16 ;ink control
    rst 16
    ld a, ... 1 ;blue ink
    rst 16
    [/CODE]
    ... functions that can be rst 16'd. If you ...
    R-Tape R-Tape August 2012 Development
  • PRINT a numerical value i.e. the scoreHow do you fo about printing a numerical value using the print routine in the ROM? For instance I have a value 0-255 and want to PRINT the result at…

    ... the print routine in the ROM?

    For instance I ...
    mcleod_ideafix mcleod_ideafix August 2012 Development
  • Coding for 128kHi all, I wonder if anyone can suggest any useful reading/threads/examples on the fundamentals of 128k coding. Chapter 24 of the +2 manual has prov…

    ... ram pages switched instead ZX rom. Also Divide PLUS support true ... 16kB ram page instead zx rom
    ..... your allram software....
    RST 0 ;restart system

    velesoft velesoft October 2012 Development
  • Help needed...I am at my wits end with this pigs ear of a routine, can anyone simplify it and make it work as it should? Basically it should make the characters '…

    ... /> call 5633 ;tell ROM we're in the upper ... ;...is switched on
    rst 16
    call print_string ; ... ld a,(ycor)
    rst 16
    ld a,(xcor ... )
    rst 16
    ld de,(stringseed ... bytes
    call 8252 ;ROM print string
    ret< ...
    R-Tape R-Tape October 2012 Development
  • WIP: ULAPlus hardware implementationThis aims to be an "almost" plug-in replacement for the Sinclair ULA chip fitted in Spectrum 16K/48K/Plus machines. It comes in a form of a small PC…

    ... and H jumpers) at the ROM chip.
    But, according to ... pin is connected to the ROM chip. This resulted in strange ... .php?p=376245&postcount=38"]details here[/URL]). A fellow ...
    mcleod_ideafix mcleod_ideafix November 2012 Hardware
<1…20212223242526…34>

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