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<1234567…34>
  • Z80 RRCA instruction...Hi Folks, Well my exploration of Z80 MCODE continues apace! I am struggling to understand how the RRCA instruction works. The official Zilog manua…

    ... succceed in dividing a 16 bits number by an 8 bits number, and then catch ... the result in 8 bits, I ...
    roko roko August 2010 Sinclair Basic
  • How do i learn to programAll the years i had a computer the only one i could program was the Texas Instruments Ti99/4a and when using extended basic with its so simple sprite…

    ... and give an effective binary number 16 bits in length. If you multiply ... you also get 65536.
    Compare with decimal where you multiply ... single register now represents a number 256 times greater. The ... this forumla to caculate the number they represent as a ...
    cyborg cyborg January 2002 Games
  • The Only Reason Sinclair Succeeded (Provoking Controversy)Although I love my Sinclairs dearly, I think that the only reason they succeeded was because at the time most people did not know any better (factori…

    ... , the Z80 can handle 16 bit number internally and the 6502 only ... you can still deal with 16 bit number faster using multiple instructions ... bits / pixel or 4 times the number of bits!
    Using games to compare ...
    JamesD JamesD September 2006 Sinclair Miscellaneous
  • The Only Reason Sinclair Succeeded (Provoking Controversy)Although I love my Sinclairs dearly, I think that the only reason they succeeded was because at the time most people did not know any better (factori…

    ... , the Z80 can handle 16 bit number internally and the 6502 only ... you can still deal with 16 bit number faster using multiple instructions ... bits / pixel or 4 times the number of bits!
    Using games to compare ...
    Spector Spector September 2006 Sinclair Miscellaneous
  • 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…

    ... of numbers we might compare: integers (16-bit and therefore ... scores. An unsigned integer, 16 bits, can hold a maximum ... range); // return random number from 0..range-1
    C's standard random number generator should generate numbers from ...
    Alcoholics Anonymous Alcoholics Anonymous July 2007 Development
  • Learning Assembly LanguageHow easy would it be to learn assembly language for someone who has a decent grasp of Basic? I mean how long do you think it would take before I coul…

    ... print
    call OUT_NUM ; Call number print

    ld de ... you are not sure how compare works then think of it ... data.
    DEFW: Define WORD - 16 BITS of data.
    DEFS: Define ...
    ASM ASM November 2010 Development
  • Deterministic random number generatorI'm looking for a random number generator in assembly which, given a seed, the generated sequence is always the same. You change the seed, you get a …

    ... below to get the full 16-bits. This is the one that ... /> ;
    ; Generates a random number in the range 0 .. RAND_MAX ... 32767
    ;
    ; This random number generator is a 32-bit ... /> ;
    ; exit : hl = random number in [0, 32767]
    ;
    Alcoholics Anonymous Alcoholics Anonymous February 2014 Development
  • (Collected) Darkhog's noob question about z80 assemblySince when I'm learning new language or library, I tend to ask lots of stupid (for any advanced person) questions and I don't want it to have mess up…

    [quote="Darkhog;52514"]
    - Regular IF z80 equivalent. e.g. If A
    Alcoholics Anonymous Alcoholics Anonymous April 2016 Development
  • Speccy games with better graphics than 16 bit versionsRecently been checking out the Atari ST, and was pretty shocked at a few games that have attrocious graphics compared to the spectrum versions... I`…

    ... speccy wins out over the 16 bits (or even arcade version)...
    CKay CKay April 2005 Games
  • Commercial life of the 16 bits?Just sat here, browsing the archive looking at the game adverts. The Spectrum went North commercially around 1993, and the C64 managed to hold on (al…

    ... how much longer did the 16-bit "replacements" the Amiga and ...
    MattLamb MattLamb March 2008 Chit chat
  • The Sinclair ZX Microdrive Resurrection Project (long)Dear Spectrum fans! [Management summary: Download [url]http://www.bartheld.net/temp/mdv2img.zip[/url] and tell me what you think. All help very much…

    ... maximum number of sectors to skip before giving up) to 16 bits. So ... probably not reading the sector number I intended to, since the ... mercy unless that exact sector number is unoccupied.

    Data ...
    Volker Volker March 2012 Emulators
  • A "bit" of a curiosityHaving to use a bit of m/code to do the AND in that key check function, I was prompted to revisit the "AND,XOR,OR,...for BASIC" topic and came up wit…

    ... inevitably slow, as it does 16 divisions and 8 exponentiations for ... 8 bits.

    [code]
    REM a = val1 = 1st number
    d = bits = number of bits to check
    g = nnnn ...
    Battle Bunny Battle Bunny June 2012 Sinclair Basic
  • Math Quiz - MultiplicationThe topic is fast multiplication routines, from 8x8 to 32x32 and all points in between. These functions sit underneath floating point libraries, gen…

    ... for multiplying two 8 bits to get a 16 bit result:
    16-bit number by an 8-bit, result in 24-bits.
    One tests whether the 16-bit number is in fact 8-bit ... if the LSB of the 16-bit number is zero and if ... of 8-bits, that's only a savings of 16 cycles. The ...
    Alcoholics Anonymous Alcoholics Anonymous January 2014 Development
  • Ports of 16 bit gamesI was watching a video for the Speccy version of Turbo Outrun where the guy who posted the video said that whilst he didn't think it was as good the …

    ... it was superior to the 16 bit versions, something I disagree ... few games ported from the 16 bits I feel that the Speccy ... pretty good conversions of the 16 bit games.

    So ... feel fell short? And what 16 bit games would you liked ...
    RonnieASA RonnieASA August 2014 Games
  • Divide by 16 problem...I think.I *think* I have a problem with division. Now, this is not for the Spectrum but it [i]is [/i]for another Z80 platform. I'm converting [b]Speccies …

    ... is why I'm using 16 bits to hold the position) the ... HL then divide it by 16 and leave the result in ...
    Sokurah Sokurah July 2015 Development
  • Enciclopedia Homebrew, new Crowfunding book about 8 and 16 bits homebrew gamesAs the Homebrew software is a Little bit forgotten compared to the classic ones, we, 3 people, have decided to write a book about Homebrew games, whi…

    ... of games from 8 and 16 bit systems (ZX, CPC, MSX ...
    Ivanzx Ivanzx October 2015 Announcements
  • undocumented Z80I am documenting a feature nobody has done before and no emulator gets right at this time. I'll have a report after doing some more tests. Fraser.

    ... HL)instruction, setting of flag bits 3 and 5.
    The ... two bits values depends upon the last 16 bit arithmetic instruction ... high byte of the last 16 bit number decremented/incremented.

    bits to reset.

    ...
    Fraser Fraser September 2002 Emulators
  • "Sinclair Zx Spectrum: Absolutely Better Than Commodore 64"Did you ever read this? [url="http://www.alfonsomartone.itb.it/fztsmo.html"]http://www.alfonsomartone.itb.it/fztsmo.html[/url]

    ... /> It's like comparing graphics. Compare the NES Super Mario Bros ... the same. The hybrid 8-16 bits CPU the SNES has is ... things than the humble 8 bits, 1 Mhz computer the NES ...
    na_th_an na_th_an July 2005 Games
  • Spectrum Gaming Eras.Hello everybody. A question I'd like to submit: In which eras would you divide the Spectrum years from the point of view of game production? Examp…

    ... to the emerging 16 bit systems. A surprising number of games are ... actually conversions of 16 bit titles ... is being done on the 16 bits leaving the Spectrum wallow in ... high street. The 8 bits and 16 bits are swept away by the ...
    Cappy Cappy September 2005 Games
  • The Only Reason Sinclair Succeeded (Provoking Controversy)Although I love my Sinclairs dearly, I think that the only reason they succeeded was because at the time most people did not know any better (factori…

    ... the Z80 isn't the number of registers it's ... 64180 but since it's 16-bit they could have ... Since each memory fetch was 16 bits wide, they could achieve a ... full 16-bit opcode fetch in one ... ez80 they also reduced the number of cycles in bus ...
    Alcoholics Anonymous Alcoholics Anonymous September 2006 Sinclair Miscellaneous
  • The Only Reason Sinclair Succeeded (Provoking Controversy)Although I love my Sinclairs dearly, I think that the only reason they succeeded was because at the time most people did not know any better (factori…

    ... each memory fetch was 16 bits wide, they could achieve ... they also reduced the number of cycles in bus ... to have improved the 16-bit addition. There are ... large savings especially for 16-bit add with carry ... IX and IY. Other 16-bit effective address calculations ...
    Alcoholics Anonymous Alcoholics Anonymous September 2006 Sinclair Miscellaneous
  • New version of k7zxHere it is version 3 of k7zx [url]http://personal.auna.com/casariche/k7zx/k7zx3.htm[/url] It supports 128k snapshots. It adds new loading methods …

    ... t 2.75))

    16 bits stereo and invert right cannel ... have to do with how bits are coded in the audio ... it is a table to compare methods and reliability:
    [url ...
    decicoder decicoder April 2007 Development
  • 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…

    ... (struct sp1_update.tile is now 16-bits; if the most significant byte ... you below and you can compare to see the differences. If ... /> ;GRAPHIC DATA:
    ;Pixel Size: ( 16, 24)
    ;Char Size: ( 2 ...
    Alcoholics Anonymous Alcoholics Anonymous July 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…

    ... . It will push 16 bits for "uchar *sbuf", then 16 bits for "uchar *dbuf ... " then 8 bits for "uchar l ... variable disp from the stack (compare to the standard way where ...
    Alcoholics Anonymous Alcoholics Anonymous July 2007 Development
  • Starting on machine code - BASIC first?Howdy. If I wanted to start learning machine code for the speccy, from scratch, would you recommend I learn BASIC first or is it entirely possible to…

    ... "near" binary with hex number equals four binary digits, what ... to add 10 to a number I don't do ... yourself months later!) that the number's bit pattern has significance ... if he sees a hex number he can be clued ... in hex (or binary but 16 bits is very very hard to ...
    Alcoholics Anonymous Alcoholics Anonymous November 2007 Development
  • Packing numbers in as least memory as possibleI am writing some code for drawing vector lines etc. on the screen. These need to be stored in memory and I want to pack them in a smaller area as po…

    ... 127 requires 7 bits to uniquely represent each number
    < ... br /> The range 0-48 requires 6 bits ... /> So the total number of bits you need is 7+ ... br /> This would use 16-bits per pair of co-ordinates ... , only wasting three bits per pair, which ...
    Digital Prawn Digital Prawn March 2008 Development
  • A BASIC compiler projectHi, I started my own BASIC compiler for the ZX Spectrum (and Z80 machines) 3 months ago. It's still in ALPHA stage (when it is mature, I will write …

    ... for two parameters
    - For 16 bits operands : HL as parameter; HL ... are implemented as 16 bits (unsigned pointers). So proceed as 16 bits.

    number of "pops" pending. The exit ... H'L' to store the number of bytes SP must be ...
    boriel boriel April 2008 Development
  • [WANTED] ASM routinesHi there, 1.) i really need 5-6 working and well commented routines, showing assembler capabilities. They should be simple, but not too much complic…

    ... , how to store previously computed number in register pair HL? zxspin ... 8-bit (1 register) in 16 bits (2 registers).

    If ...
    piters piters June 2008 Emulators
  • megadrive and mastersystem gamesyo know what to do next, list your faves, and discuss

    ... (simpler than the arcade or 16 bit versions but added the ... the original not seen on 16 bits til super ghouls n' ghosts ... a really shite game, but compare the 2 versions and laugh ...
    dm_boozefreek dm_boozefreek July 2008 Chit chat
  • In ye olde days of computingI found this page about some of the the history of home-computing. Maybe not complete, but still: [URL]http://www.jaapan.de/jp/homecomputer.php?page=…

    ... miles ahead of the 8-bits in terms of technology.[/QUOTE ... solved eventually with a sufficient number of parallel 8-bit CPUs ... :

    8-bit to 16-bit was a massive jump ... perfect replicas on the 16-bits.

    16-bit to 32-bit ...
    Lockett Lockett October 2008 Chit chat
<1234567…34>

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