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  • Manic Miner ZX81Hi Guys, Can anyone explain why [url=http://www.worldofspectrum.org/infoseekid.cgi?id=0017539]Manic Miner ZX81[/url] is not able to reproduce the ex…

    ... 's changing where in the ROM it looks for character set ... there's nowhere in the ROM where you'll find every ... ' is a list of random numbers you have to hunt through ...
    joefish joefish March 2012 Sinclair Miscellaneous
  • 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 ... number samples taken for both numbers and the difference is about ...
    Z80user Z80user March 2012 Emulators
  • Deathchase improvementsI have spent the last couple of months bringing out an "enhanced" version of Deathchase which I called "Deathchase 2012". Unfortunately because it us…

    ... Deathchase uses the Spectrum ROM at any point during ... /> [*]The game uses the ROM fonts (print routine at $6949 ... /> [*]The game uses random ROM data ($3CDD+) when drawing explosion ... uses random ROM data ($0000-$07FF) to generate random numbers (routine ...
    Jimmy Jimmy April 2012 New game ideas
  • Screen routinesHello. For my games I?m using the sprites routine method of a screen buffer and when I finish to print all the sprites I dump all the buffer in the …

    ... dumps 16 columns of background (rom in this case) and masks ... forum, was treating 16 bit numbers in an 8 bit fashion ...
    R-Tape R-Tape May 2012 Development
  • 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
  • Xor-shift random number generator for Z80[QUOTE=Patrik Rak;320244]Come on, people, [URL="http://www.jstatsoft.org/v08/i14/paper"]xor-shift generators[/URL] devised by Marsaglia, that's the w…

    ... bit 16.16 fixed point numbers, it's pretty trivial to ... that spits out 8 bit numbers.

    To make a ... , and doesn't use the ROM one; though I think the ...
    Gedlion Gedlion May 2012 Development
  • Encode two positive int numbers into one?Hi guys) Recently I've been trying to simulate short lists in Basic, but the point is that using limited values, say, 0-99 or 0-999, I remembered ho…

    ... 't you have to pad numbers of less than 3 digits ... to BASin. Looking at the ROM disassembly that's no wonder ...
    Battle Bunny Battle Bunny June 2012 Sinclair Basic
  • Odd versions of the Multiface One.I've been looking through the adverts for the Multiface One and it's clear that there were a number of versions available. Note the earliest advert …

    ... has the usual E4, FF numbers, and matches the CRC32 of ... changes whenever I modify the ROM (add 1 to any byte ... overwriting the MF1 ROM with the MF128 old rom and see if ...
    Jmk Jmk June 2012 Hardware
  • Odd versions of the Multiface One.I've been looking through the adverts for the Multiface One and it's clear that there were a number of versions available. Note the earliest advert …

    ... thought about how your ROM could be the same ... would return different second numbers. Another thing that needs ... br /> To confirm that the ROM is exactly the same go ... : "fc /b mf1.rom mf1other.rom" and see if there ... and get the mf12835.rom from the Romantic Robot ...
    Jmk Jmk June 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 …

    ... a routine for printing hexadecimal numbers:
    [code]
    printhexhl
    ROM to display the numbers). I had something ...
    Dr BEEP Dr BEEP June 2012 Development
  • Sending key presses to the spectrumfor a project I want to send automated keyboard presses to the ZX via a micro-controller. Is it possible to send these through the expansion slot? …

    ... " and "ENTER", whose row/columns numbers would be: 1,3 and ... with the Spectrum running the ROM keyboard routine, which changes the ... per second than the standard ROM keyboard routine.
    mcleod_ideafix mcleod_ideafix August 2012 Hardware
  • redirecting Z80 sub-routine CALLsI'm working on changing a TR-DOS disk program to work from standard +128k tape and thought that rather than painstakingly working through the code ma…

    ... just to determine the sector numbers & lengths being read, and ... /> Debugger breakpoint + burning your own ROM. Or special hardware (but relatively ...
    tstih tstih 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…

    ... a non ROM method that allows bigger numbers. Or maybe ... a,22 ;ROM 'at'
    rst 16 ;rom routine deals with ... br /> rst 16 ;rom routine deals with contents of ... br /> rst 16 ;rom routine deals with contents of ... br /> call 6683 ;rom routine that prints the ...
    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…

    ... by 100. 6683 is the rom routine you're after. Trouble ... find a non ROM method that allows bigger numbers. Or maybe stopping ...
    ub880d ub880d August 2012 Development
  • Tutorial - learn machine code in 30mins[B][I]Message from the moderators[/I] - bigjon has requested that readers' attention be drawn to a better version of this tutorial, one which is easi…

    ... deals with single bytes only (numbers 0 to 255), the other ... -
    Choose a location in ROM where the are 256 random ... ;source of random bytes in ROM
    ld d,0
    ROM
    ld d,0
    buzzy buzzy September 2012 Development
  • What Spectrum projects (Software/Games/Utility)(Hardware)(Others) are you working on?So, basically that :) You dont have to give names or more clues if you dont want to ;) Also, if you are working on more than one, you can tell all of…

    ... research into emulation for endless numbers of minority disk interfaces (Wafadrive ... /Kempston (missing bootdisk and one ROM), SwiftDisc (really puzzling) and Rocky ...
    Jmk Jmk November 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 ... is what I assume the numbers mean here) at 0x3800. Spectaculator ...
    mcleod_ideafix mcleod_ideafix November 2012 Hardware
  • Elliptical ChallengeSubsequent to the recent "Graph Plot" thread, I wrote this general purpose ellipse drawing routine which will plot (although it doesn't actually use …

    ... slow sqrt routine in the rom. They were pushed for space ... times faster for 16 bit numbers and 50 times faster for ... 32 bit numbers. That's usually close enough ...
    Gedlion Gedlion November 2012 Development
  • z80 mathMost likely you know old good [url]http://baze.au.com/misc/z80bits.html[/url] . Moment ago i accidentally find this page : [url]http://www.andreadr…

    ... be faster than ROM calculator, allowing simple manipulation with numbers through 16 ...
    catmeows catmeows November 2012 Development
  • [B]THE ROM CHIPS[/B]Could anyone see and tell me which the exact numbers and letters printed on the rom chips in Spectrum +2 are?

    ... which the exact numbers and letters printed on the rom chips in ...
    guesser guesser December 2012 Hardware
  • RAM used / corrupted by +3DOSAs I said previously, [url=http://www.worldofspectrum.org/forums/showthread.php?t=41775]I'm trying to put some games in hard disk[/url] so they can b…

    ... is paged. Page 7 and ROM 2 must be selected, in ... SET to ensure that proper ROM is selected, but In your ... showing the "true" values of numbers. Also, it can list the ...
    Zup Zup December 2012 Games
  • calculator and sinusok, look at the Sysel's routine: [PHP]3 5b00 *s 4 5b00 tabsin = #7000 03 mksin 19.11.1995 Busy soft …

    ... /> would be great to find ROM routine which prints FP from ... less than 1, and large numbers, numerically greater than 2 ^ 27 ... the decimal. This brings all numbers into the middle range, and ... the numbers of digits required before the ...
    g0blinish g0blinish December 2012 Development
  • Time for all games to become (legally) available?It just came to me that none of us are getting any younger. Not much of an earth-shattering statement I know, but more came of this original thought.…

    ... return (particularly given the high numbers of copies which get sold ... sell games collections on CD-ROM or DVD - is it fair ...
    rwap rwap March 2013 Games
  • Time for all games to become (legally) available?It just came to me that none of us are getting any younger. Not much of an earth-shattering statement I know, but more came of this original thought.…

    ... need enough to make the numbers work.

    It's ... single SNES or Genesis/Megadrive ROM.
    Sadako Sadako March 2013 Games
  • A quick newbish questionI'm reading through 'mastering machine code on your spectrum',as kindly posted by Mr bert on this forum. Correct me if I'm wrong from what i read,bu…

    ... only and contains the Spectrum ROM .

    Locations 16384 -22527 ... . (Try POKEing 16384 with different numbers and you see how each ...
    rich_chandler rich_chandler March 2013 Development
  • Font hack that was used in a lot of early gamesThere was a little hack for changing the fonts on a spectrum and I remember it being used in a couple of old games on the 48k, it was a sort of ye od…

    ... one in the ROM. Then BASIC and the ROM routines would display ... of the font from the ROM. But you could get several ... (ASCII 32-95) which covers numbers, capitals and punctuation and forget ...
    joefish joefish April 2013 Sinclair Basic
  • Raising to the powerA curiosity of ZX Basic I found yesterday is that you can't do this: [code] 10 LET x=-3 20 LET y=x^2 [/code] While you can for example do LET y=-3^…

    ... explained ...

    The Spectrum ROM calculates X^Y as EXP ... won't work for negative numbers and repetitive multiplication has to ...
    Battle Bunny Battle Bunny April 2013 Sinclair Basic
  • BIN2BAS (load BASIC text into emulator) utilityI've nearly finished testing this. It allows a BASIC program to be loaded from a text file in any emulator which has a "load binary" option. I was wo…

    ... the first time the Shadow ROM is paged, not only does ... /> 1010 OPEN #4;"m";1;"Numbers": CLOSE #4
    1020 FORMAT ...
    2010 MOVE "m";1;"Numbers" TO #2: MOVE "m";1 ... ;"Numbers" TO "m";1;"Numbers2"
    < ...
    Battle Bunny Battle Bunny April 2013 Sinclair Basic
  • BIN2BAS (load BASIC text into emulator) utilityI've nearly finished testing this. It allows a BASIC program to be loaded from a text file in any emulator which has a "load binary" option. I was wo…

    ... /deleted, as it uses the ROM's editor to enter the ... lines manually.

    * Line numbers do not need to be ... using the Spectrum's own ROM routines to check the BASIC ...
    Battle Bunny Battle Bunny May 2013 Sinclair Basic
<1…13141516171819…34>

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