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  • Remainder (Mod) calculationsI've been figuring out how to calculate remainders after integer division by a constant divisor k (A mod k = A % k). I found that for most small di…

    [quote="Paradigm Shifter;982963"]Most division routines end up with the remainder as a side effect so you shouldn't have to do the multiplication to get the remainder if you have to divide first[/quote]
    If you calculate division by a constant using ...
    Magne Magne October 2021 Assembler
  • FOR vs LET (speed)Hi dear friends. A question for you 10 FOR I = 0 TO 10 11 PRINT I 12 NEXT I 10 LET I = 0 20 PRINT I 30 LET I = I+1 40 IF I < 11 THEN GOTO …

    ... , for procedures, BBC BASIC uses table system I think.

    Z80 code), it was not coded ...
    1024MAK 1024MAK November 2021 BASIC
  • Easiest way to figure instruction lengthGiven a start address, what is the easiest way to find out instruction length at that address in Z80? I found [url="http://www.z80.info/decoding.htm"…

    ... end I went for the table solution, but not a handler ... table but an index table. As I'm ... byte page and use this table to convert instruction to index ... the JIT method to "control" Z80 in all situations.
    tstih tstih March 2022 Development
  • Easiest way to figure instruction lengthGiven a start address, what is the easiest way to find out instruction length at that address in Z80? I found [url="http://www.z80.info/decoding.htm"…

    ... JIT emulation of Z80 on Z80. I have an ... because we are on Z80 already, there's ... INC HL ; Go to next table address
    DEC E ... HL ; Go to next table address
    DEC E ...
    tstih tstih March 2022 Development
  • How to disable the "scroll?" message?Hello. I'm a beginner Z80 assembly programmer and I decided to make a ZX Spectrum game to practice my skills and gain some more experience. I curr…

    ... /> ALIGN 64
    ; modify this table to be based at #4000 ...

    output:
    SjASMPlus Z80 Cross-Assembler v1.18.2 ...
    Paradigm Shifter Paradigm Shifter June 2022 Development
  • Island (the remix)I've been working on a more polished version of my C.S.S.C.G.C 2022 entry Island. So just like the old days I'd thought I create some over hyped prom…

    ... (C#) to build the frequency table super easily). Huffman is easy ... creates p-code that a z80 vm can use, the only ...
    Luny Luny August 2022 Software
  • Console frameworkStill working on Specotron, but at the point where working out the diagonal lines collision is not good at beer o'clock. In the meantime I've knoc…

    ... address of the screen rows table page
    ; add on ... first byte of value in table
    inc l
    ... (hl) ; second byte of table
    add d ; add ... address of the screen rows table page
    ; add on ... first byte of value in table
    inc l
    ...
    Paradigm Shifter Paradigm Shifter September 2022 Development
  • Console frameworkStill working on Specotron, but at the point where working out the diagonal lines collision is not good at beer o'clock. In the meantime I've knoc…

    ... ; address of the screen rows table page
    ; add on twice ... ) ; first byte of value in table
    inc l
    ld ... ; address of the screen rows table page
    ; add on twice ... /> ; code borrowed from here http://z80-heaven.wikidot.com/math#toc32 ...
    Paradigm Shifter Paradigm Shifter September 2022 Development
  • Console frameworkStill working on Specotron, but at the point where working out the diagonal lines collision is not good at beer o'clock. In the meantime I've knoc…

    ... address of the screen rows table page
    ; add on ... first byte of value in table
    inc l
    ... (hl) ; second byte of table
    add d ; add ... address of the screen rows table page
    ; add on ... first byte of value in table
    inc l
    ...
    Paradigm Shifter Paradigm Shifter September 2022 Development
  • Console frameworkStill working on Specotron, but at the point where working out the diagonal lines collision is not good at beer o'clock. In the meantime I've knoc…

    ... address of the screen rows table page
    ; add on ... first byte of value in table
    inc l
    ... (hl) ; second byte of table
    add d ; add ... address of the screen rows table page
    ; add on ... first byte of value in table
    inc l
    ...
    Paradigm Shifter Paradigm Shifter September 2022 Development
  • Console frameworkStill working on Specotron, but at the point where working out the diagonal lines collision is not good at beer o'clock. In the meantime I've knoc…

    ... ; address of the screen rows table page
    ; add on ... /> ; code borrowed from here http://z80-heaven.wikidot.com/math#toc32 ... was not found in intrinscis table
    ; otherwise DE has ... /> jr z, .notfound ; end of table
    push hl ; push start ...
    Paradigm Shifter Paradigm Shifter September 2022 Development
  • Console frameworkStill working on Specotron, but at the point where working out the diagonal lines collision is not good at beer o'clock. In the meantime I've knoc…

    ... address of the screen rows table page
    ; add on ... first byte of value in table
    inc l
    ... (hl) ; second byte of table
    add d ; add ... address of the screen rows table page
    ; add on ... first byte of value in table
    inc l
    ...
    Paradigm Shifter Paradigm Shifter September 2022 Development
  • Console frameworkStill working on Specotron, but at the point where working out the diagonal lines collision is not good at beer o'clock. In the meantime I've knoc…

    ... address of the screen rows table page
    ; add on ... first byte of value in table
    inc l
    ... (hl) ; second byte of table
    add d ; add ... address of the screen rows table page
    ; add on ... first byte of value in table
    inc l
    ...
    Paradigm Shifter Paradigm Shifter September 2022 Development
  • Console frameworkStill working on Specotron, but at the point where working out the diagonal lines collision is not good at beer o'clock. In the meantime I've knoc…

    ... ; address of the screen rows table page
    ; add on ... /> ; code borrowed from here http://z80-heaven.wikidot.com/math#toc32 ... was not found in intrinscis table
    ; otherwise DE has ... /> jr z, .notfound ; end of table
    push hl ; push start ...
    Paradigm Shifter Paradigm Shifter September 2022 Development
  • Console frameworkStill working on Specotron, but at the point where working out the diagonal lines collision is not good at beer o'clock. In the meantime I've knoc…

    ... ; address of the screen rows table page
    ; add on ... /> ; code borrowed from here http://z80-heaven.wikidot.com/math#toc32 ... was not found in intrinscis table
    ; otherwise DE has ... /> jr z, .notfound ; end of table
    push hl ; push start ...
    Paradigm Shifter Paradigm Shifter September 2022 Development
  • Standard Development LibrariesSo after some time away I decided to re-register after a Twitter thread (https://twitter.com/SpectrumNez/status/1578158361236963328) led me to a Visu…

    ... make games, Spectrum hardware and Z80 programming. Just do it!
    table at a specific place like ...
    Timmy Timmy October 2022 Assembler
  • Dos emulators / games & Win XPHaving just brought a new computer which comes with XP I am having difficulty running my usual spectrum emulator (Z80). When I run it, it runs in a D…

    ... running my usual spectrum emulator (Z80). When I run it, it ...
    Martin Martin February 2002 Emulators
  • can you make .dsk files?Hi all, Does anyone know of an emulator or prog that lets you save a tap,tzx or z80 file to a +3 dsk file? I have access to a friends pc that has an…

    ... save a tap,tzx or z80 file to a +3 dsk ...
    Bluemanjay Bluemanjay February 2002 Emulators
  • Z80, TZX and TAP formatsHi again I?ve seen these three formats as the most common of all. The doubt is... Which is the best of them? What are the differences between them? …

    Hi again
    I?ve seen these three formats as the most common of all. The doubt is... Which is the best of them? What are the differences between them? Which should I take, if the three are available for the same game?
    Thanks in advance again
    Anonymous Anonymous November 2001 Emulators
  • PocketClive bugHi... thought I would give all of you that downloaded PocketClive, the PocketPC spectrum emuator a small bug report! There is a bug that prevents …

    ... prevents you from seeing any .z80 files stored in the \Program ... .sna file and all your .z80 should appear as by magic ...
    Anders Anders October 2001 Emulators
  • Warajevo compilerThere is a problem by Warajevo Z80-compiler. I want to compile files with the possibility of record and load. I use an option / TAPE (/ TAPE!). Ever…

    ... is a problem by Warajevo Z80-compiler.
    I want to ...
    Ozzy Ozzy September 2001 Emulators
  • Emulator compatibility with real SpectrumHi emulator programmers... Having spotted for the last 6 months that my iPAQ is still missing a Spectrum emulator I started typing last tuesday - an…

    ... is really simple (run the z80 for 69888 tstates, issue a ... z80 interrupt and update the display ( ... that I have converted a Z80 emulator found on the net ...
    Anders Anders September 2001 Emulators
  • Help with my first emulatorActually, when I say 'first' that's a bit of a lie - I used to own a mac and had Macspectacle which was dandy. Now, however I have a PC running Windo…

    ... emulator to use. I downloaded Z80 and that was a bit ...
    Jeff Jeff August 2001 Emulators
  • Joystick helphi...... I am trying to find a spectrum emulator that supports my Gamepad that i have plugged into my PC. Which is the best emulator for PC joystick/…

    ... ........i have tried r80 and z80 but (unless) i am doing ...
    I I May 2001 Emulators
  • Missing in action!!!!!!!!!From here, I hope gamers can exchange hard to find files with one another. Personally, I am looking for a TAP or Z80 version of Seymour goes to Holl…

    ... looking for a TAP or Z80 version of Seymour goes to ...
    Rob Rob March 2001 Emulators
  • Why so few open source Spectrum emulators?A couple of days ago I started to look into converting an existing Spectrum emulator to Pocket PC (mainly the iPaq) and ran into problems directly. T…

    ... some excellent emulators such as Z80 and zxz that I might ...
    Anders Anders January 2001 Emulators
  • Interface for PC ZXSee last entry of former TOPIC. I'm working on the interface. Info about it on MISCELLANEOUS Author: Arjun (---.bng.vsnl.net.in) Date: 08-13-01 …

    ... ? I been trying to master z80 machine code for 20 years ...
    Dr BEEP Dr BEEP November 2001 Games
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