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  • Setting breakpoints in source code to make debugging easierAfter two years I've resumed my Speccy coding project. I'm porting a yet "unported" game from C64/Atari to 48k Spectrum using Z80 assembler. At the m…

    ... Speccy" emulator for running my code. Occasionally I also use Fuse ... instruction or macro in the code, which when encountered, would ... long delay loop in the code in the "interesting place", ... and memory, continuing the code execution is not possible as ...
    arttu arttu August 2019 Development
  • zx81 loading and saving codei cant get registered with the zx81 forum, so i thought id try here. how is this done? ive tried loading and saving using code xxxxx,xxxx but nothing…

    i cant get registered with the zx81 forum, so i thought id try here. how is this done? ive tried loading and saving using code xxxxx,xxxx but nothing seems to work.
    digital digital October 2019 Chit chat
  • How do emulators make code appears as running at 3.5Mhz?Decent Z80 emulators on github return t-states after executing an instruction, giving you the ability to emulate Speccy relatively well. But there ar…

    ... ) If I were to write code to emulate screen I would ...
    tstih tstih October 2019 Development
  • 2xBooks: Assembly Language For Arcade Games & Machine Code Sprites And GraphicsI'm looking for the following two books to help my machine code game programming: 1) Assembly Language For Arcade Games and Other Fast Spectrum Prog…

    ... books to help my machine code game programming:
    1) Assembly ... Stuart Nicholls
    2) Machine Code Sprites And Graphics For The ...
    LevelUp LevelUp November 2019 Wanted
  • im having problems stripping the database out of this code for quill adventure writerim trying to get the database out of rouge midget. ive managed to do this with another game written using quill but this one is too big. theres no…

    ... to remove some of the code in the last game to ... trying to load the "rmidget" code file.
    digital digital April 2020 Assembler
  • how do i set this code up, so i can print more than one line of text?well i got it working but how do i set this code up, so i can print more than one line of text? with a loop or something? not sure where to start on …

    ... how do i set this code up, so i can print ... , or using completely different code

    [code]org 40000
    ld ... 21, 0, 20, 0
    [/code]
    digital digital June 2020 Assembler
  • why am i getting b integer out of range in this code?ive tried running this in spin but thats what i get [code]main org 40000; ; We want a black screen. ld a,71 ; white ink (7) on black paper (0…

    ... i get

    [code]main
    org 40000;
    mushlp ld a,22 ; control code for AT character.
    rst ... basexy ld a,22 ; AT code.
    rst 16
    ld ... /> ld a,144 ; ASCII code for User Defined Graphic 'A ... ,60,60,60 ; mushroom.[/code]
    digital digital June 2020 Assembler
  • this code wont give me a random starfieldim using a peice of code that ive copied from a book, ignore most of it as it is redundant. for some reason i get a strange random starfield instead …

    ... one.

    [code]main
    org 40000;
    code.
    rst 16
    ... ld a,144 ; ASCII code for User Defined Graphic 'A ... 60,60,60 ; mushroom.
    [/code]


    ... look at the peice of code ''this is the bit ...
    digital digital July 2020 Assembler
  • Penetrator - Compiled Basic ?For clarity: The Melbourne House sideways scrolling 'shoot em up' game, a very good game for its time and it still plays relatively well today, with …

    ... clarity: The Melbourne House sideways scrolling 'shoot em up' game, a ... very cursory glance at the code did not really reveal anything ...
    spider spider July 2020 Games
  • CODE instruction in array$ PRINTSo I'm still plugging away at BASIC and have found a line of code (another!) that's really puzzling me. The line is as follows: PRINT A$(P+Q TO P…

    ... have found a line of code (another!) that's really ... $(P+Q TO P+R+CODE A$(P+T)),
    ... /> So as I understand the code line, it reads:
    ... br /> However, there's a CODE instruction in there and I ... I am misundertanding how the CODE instruction works or I' ...
    LevelUp LevelUp October 2020 BASIC
  • Prefered Tools for Developing Maching Code in 2021I am considering this year to fulfill my goal of actually writing machine code programs for the ZX Spectrum. I am an accomplished object oriented cod…

    ... goal of actually writing machine code programs for the ZX Spectrum ...
    Scottie_uk Scottie_uk January 2021 Assembler
  • Last Problem in Chapter 3 of Toni Baker's Mastering Machine Code on your ZX Spectrum.Chapter 3 of this great book is all about how to use the registers and covers the operations LD, ADD, ADC, SUB, SBC, INC, DEC, SCF and CCF. The la…

    ... would be appeciated.

    [code]Op Hex Notes
    LD ... C9 Return to basic
    [/code]
    Scottie_uk Scottie_uk February 2021 Assembler
  • Did you know that OBD II Code Readers can be bought new very cheaply?I got mine before Covid struck and the cheapest one was about £10 .Most cars built after about 1997 have an OBD II port hidden away usually under th…

    ... up your car and the code tells where the fault is ... mostly from China) . The cheaper Code Readers are very basic and ...
    harriusherbartio harriusherbartio August 2021 Chit chat
  • ZEsarUX 10.0ZEsarUX 10.0 is out! Download it from : https://github.com/chernandezba/zesarux/releases/tag/10.0 Changes: Version 10.0 - Clive Sinclair edi…

    ... : click (toggle breakpoint, change registers), scrolling up/down by using the ... line setting to load source code

    Improved ZX Vision ...
    chernandezba chernandezba October 2021 Emulators
  • How do you publish your Z80 code online?I'm starting a blog about my pet project. One of the requirements is to publish explanatory Z80 code. What tools do you use for syntax highlighting? …

    ... is to publish explanatory Z80 code. What tools do you use ... I can feed raw Z80 code with and it does formatting ... 'm not afraid to write code for that). Perhaps even a ... that require me to feed code into editor and convert it ...
    tstih tstih December 2021 Development
  • shamazx dma 15x anyone intereted? was hoping to get ula+ full screen animations working any programmers think they could disect rtype replace screen scrolling…

    ... disect rtype replace screen scrolling with dma code?

    Attach Poll ...
    rogerjowett1 rogerjowett1 April 2022 Hardware
  • shamazx dma15x anyone intereted? was hoping to get ula+ full screen animations working any programmers think they could disect rtype replace screen scrolling w…

    ... disect rtype replace screen scrolling with dma code?

    Attach Poll ...
    rogerjowett1 rogerjowett1 April 2022 Hardware Preservation
  • shamazx dma 15x anyone intereted? was hoping to get ula+ full screen animations working any programmers think they could disect rtype replace screen scrolling…

    ... disect rtype replace screen scrolling with dma code?

    Attach Poll ...
    rogerjowett1 rogerjowett1 April 2022 Hardware
  • 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…

    ... raw machine code. You won't find any 8 way scrolling games ... for basic and the machine code. You don't have enough ... a way condusive to good code.

    I'm sorry ...
    cyborg cyborg January 2002 Games
  • Your favourite machine apart from The SpectrumI've asked this on a couple of other sites, so now it's time to ask it here: what is your favourite machine, forgetting about the Speccy? For me, it'…

    ... 2 used a 8x8 pixel scrolling pattern to avoid attribute clash ... - easier, quicker and using less code than if the memory was ...
    cyborg cyborg November 2001 Games
  • Your favourite machine apart from The SpectrumI've asked this on a couple of other sites, so now it's time to ask it here: what is your favourite machine, forgetting about the Speccy? For me, it'…

    ... C64 is absolutely better for scrolling games.. but his wider pixels ... also speccy had cool ones.. Zynaps, AgentX or R-type has ... plenty of colors.. I guess Zynaps is comparable with C64 shootemups..
    Javier Javier November 2001 Games
  • Games UNDERated by magazinesYep, a slight twist on the previous topic. Which were the games you thought were underrated by mags, but were really much better in your opinion. …

    ... about Zynaps - perfectly programmed!

    Stormlord - same sort of scrolling - but ...
    +CotL-DS +CotL-DS April 2002 Games
  • Whos Your Favourite Game Programmer ? Mine's Keith Burkhill, Mike Lamb. Its the people behind Commando, Arkanoid. There are others cant remember their names, I'll continue later [img]/_…

    ... the Mask (revolutionary, pieces of code used in Incentive's Freescape ... 2
    14. Dominic Robinson - Zynaps (Flying Shark is a piece ...
    Mikie Mikie June 2002 Games
  • Whos Your Favourite Game Programmer ? Mine's Keith Burkhill, Mike Lamb. Its the people behind Commando, Arkanoid. There are others cant remember their names, I'll continue later [img]/_…

    ... colour large sprites and fast scrolling)

    7. P.Mochan ... /> 14. Dominic Robinson
    > Zynaps * Flying Shark (I believe it ...
    Arjun Arjun June 2002 Games
  • ScrollingBit of a daft topic but anyway... Which game had the best scrolling? I would have to volunteer Commando and its silky-smooth scrolling. A particula…

    I thought Zynaps had great full colour horizontal scrolling and alongwith ... two had the best horizontal scrolling on the Speccy.
    ... liked the fast full colour scrolling in Lightforce too. Brilliant ... for Extreme, yep good scrolling effects in full colour but ...
    Arjun Arjun June 2002 Games
  • ScrollingBit of a daft topic but anyway... Which game had the best scrolling? I would have to volunteer Commando and its silky-smooth scrolling. A particula…

    I reckon Ghosts & Goblins had the smoothest scrolling, 8 directional & 2 speed! Runners up are:

    Stormlord
    Zynaps
    Terra Cresta
    Marauder
    +CotL-DS +CotL-DS June 2002 Games
  • ScrollingBit of a daft topic but anyway... Which game had the best scrolling? I would have to volunteer Commando and its silky-smooth scrolling. A particula…

    ... should be for the bit scrolling in. Then you need to ... .
    I would post some code examples but I don't ...
    Anonymous Anonymous June 2002 Games
  • ScrollingBit of a daft topic but anyway... Which game had the best scrolling? I would have to volunteer Commando and its silky-smooth scrolling. A particula…

    Yes. You are quite right. Scrolling a speccy screen is painful ... /> Commando, I believe, uses dedicated code to dump each background feature ...
    frobush frobush June 2002 Games
  • ScrollingBit of a daft topic but anyway... Which game had the best scrolling? I would have to volunteer Commando and its silky-smooth scrolling. A particula…

    I once wrote a machine code to scroll the screen horizontally - ... to write than a vertical scrolling routine, but would be harder ... speed.

    I think scrolling made some games worse - Cybernoid ... it had been done with scrolling it would have had to ...
    Neil^P Neil^P June 2002 Games
  • ScrollingBit of a daft topic but anyway... Which game had the best scrolling? I would have to volunteer Commando and its silky-smooth scrolling. A particula…

    ... />
    I'll find my code and write some comments on ... /> I still maintain that vertical scrolling is a lot more straightforward ...
    Anonymous Anonymous June 2002 Games
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