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<1…13141516171819…34>
  • Faulty Issue 1Hi all, thought I'd document my efforts in getting another speccy working. I've never done this before so please bear with me... I recently took a p…

    ... (start)(screen RAM and system variables in this section of RAM ... : 65535 End of Z80 address space.

    [b][i]Mark ...
    1024MAK 1024MAK November 2015 Hardware
  • ZX81 Character SetHello, hope I don't offend anyone with my request. I've put together a program on my Amstrad that redefines a condensed text and displays it appropri…

    ... BASIC doesn't support integer variables so you'd need to ... work with character/string variables instead. Ideally you'd pack ... tightly into bytes to save space, but this would obviously slow ...
    GReW GReW December 2015 Sinclair Miscellaneous
  • BASIC Tenliners 2016I would like invite all basic programmers to this year's BASIC Tenliners contest. You have to code a game in 10 lines of BASIC. For details please ta…

    ... is saved with all the variables intact, is that allowed, or ... it with data/reuse the space for variables?

    Finally, you ...
    GReW GReW January 2016 Announcements
  • BASIC Tenliners 2016I would like invite all basic programmers to this year's BASIC Tenliners contest. You have to code a game in 10 lines of BASIC. For details please ta…

    ... is saved with all the variables intact, is that allowed, or ... it with data/reuse the space for variables?

    [/quote]
    Bunsen Bunsen January 2016 Announcements
  • 48K Memory MapHi, I'm having some trouble understanding the top of the 48K Memory Map. From reading elsewhere I have this as the memory map: 0 to 16383 - …

    ... time the system needs more space, items in the top of ... being held in the system variables, or in Z80 registers.
    1024MAK 1024MAK March 2016 Development
  • Function with push and popIm trying to see if I understand push and pop when it comes to using to pass parameters to functions: [code] LD HL,16384 LD A,5 Push AF Ld A…

    Keeping variables on the stack is not ... /> [code]; First, we reserve some space.
    LD IX,-2

    ;Finally, we free the space on the stack.
    LD ...
    Jmk Jmk April 2016 Development
  • Function with push and popIm trying to see if I understand push and pop when it comes to using to pass parameters to functions: [code] LD HL,16384 LD A,5 Push AF Ld A…

    ... the current working set of variables in registers (working set = stuff ... smaller method for accessing stack variables. This is partly helped by ... byte
    189
    190 ; Variables indexed by ix, LSB first ...
    Alcoholics Anonymous Alcoholics Anonymous April 2016 Development
  • z88dk TutorialHi, Could anyone direct to to a recent MS Windows based tutorial on getting started with z88dk. I know a small amount of C, so it's more the comp…

    ... build and set some environment variables as detailed in the instructions ... in ROM from the RAM variables.

    The drivers in ... is taking up the memory space in the output binary:
    space in the output binary.
    Alcoholics Anonymous Alcoholics Anonymous June 2016 Development
  • A z88dk + sp1 demo (with source)Since nowadays people are still wondering about how difficult it is to make something in z88dk, I thought I just put a very simple demo to show how e…

    The version for the new c library is split between two files. One holds the C code and the other holds the asm stuff. The compile lines are listed at the top of demo.c. "q" increases the number of sprites, "a" decreases the number of sprites, "p" ...
    Alcoholics Anonymous Alcoholics Anonymous June 2016 Development
  • Leading Zeroes on a Score in BASICI'm trying to print the score with leading zeroes such that it's always 6 characters wide, i.e.: 000010, 000150, 006100 etc. I quickly knocked thi…

    ... stages are:
    * declare any variables;
    * mark start time;
    variables (ie. assigning space for them before they ... performance if frequently referenced variables are declared first. Variables can be declared ...
    Battle Bunny Battle Bunny July 2016 Sinclair Basic
  • Empire - port of trs80 basic programBack when I was a little kid, I had the opportunity to play around with a trs80 model 1 with level 2 basic. One of the games I often played was call…

    ... size strings. The amount of space set aside for growing these ... like sinclair basic unless the variables have been defined as a ...
    Alcoholics Anonymous Alcoholics Anonymous July 2016 Brand new software
  • Empire - port of trs80 basic programBack when I was a little kid, I had the opportunity to play around with a trs80 model 1 with level 2 basic. One of the games I often played was call…

    ... the instructions, as there's space for the file in RAM ... in RAM = 19,613
    variables in VARS = 1,653
    Not all of the variables have been declared, as the ...
    Battle Bunny Battle Bunny August 2016 Brand new software
  • Question - SAMS Timex Sinclair 2068 Beginner/Intermediate GuideHi all, I just acquired a T/S 2068 and the a book that came with it is, SAMS Timex Sinclair 2068 Beginner/Intermediate Guide. On page 18 of thi…

    ... ts2068 reserves more space for the system variables for future expansion and ...
    Alcoholics Anonymous Alcoholics Anonymous August 2016 Hardware
  • Empire - port of trs80 basic programBack when I was a little kid, I had the opportunity to play around with a trs80 model 1 with level 2 basic. One of the games I often played was call…

    ... in a PAUSE option (Press SPACE to pause the scrolling text ... slowly flash black/white; Press SPACE until current BORDER colour restored ... in RAM = 21,478
    variables in VARS = 2,242 (details ...
    Battle Bunny Battle Bunny August 2016 Brand new software
  • Speeding up programs by hacking the SysVarsPositively pleased to properly discover this area of the forum! I have a couple of recent tricks that might be of interest - they're probably old hat…

    ... /> Similarly with VARS, if variables are pre-declared so that ... separate local & global variables with the same name. Something ... are just place holders for variables, but in that case ... question, multi-statement lines save space, not time. Each statement ...
    Battle Bunny Battle Bunny August 2016 Sinclair Basic
  • Speeding up programs by hacking the SysVarsPositively pleased to properly discover this area of the forum! I have a couple of recent tricks that might be of interest - they're probably old hat…

    ... space allocated by a DEF FN as a mini-variables ... This locates the parameter space for the FN and saves ... So there can be global variables r,c,z$ present as ... As long as all variables for each area are declared ... always re-allocated new space below E_LINE when a ...
    Battle Bunny Battle Bunny September 2016 Sinclair Basic
  • Line DemoI was looking in the source code of another game (that Akalabeth game), with lots of line drawings. The difference was that they don't use the PL…

    ... , or even reserving some space between the System Variables and (CHANS). The ...
    The_Bert The_Bert September 2016 Sinclair Basic
  • Running out of fingers in AssemblyDear all, Still trying to learn Assembly and have put a few routines together. However, as my routines become a little more involved I find myself…

    ... 't think of registers as variables. Treat registers as the temporary ... of calculations.

    For variables, label a byte or two ... to save that space. But initialising all your variables through code takes ...
    joefish joefish September 2016 Development
  • Running out of fingers in AssemblyDear all, Still trying to learn Assembly and have put a few routines together. However, as my routines become a little more involved I find myself…

    ... , separation of io and address space, register pairing, etc) and non ... intermediate or final values to variables in memory. You just want ...
    Alcoholics Anonymous Alcoholics Anonymous September 2016 Development
  • Where does the BASIC program sit 48K Spectrum memory?Hi there First post so be gentle, I've had a spectrum since the 80's and have recently started programming it for fun again. I wrote the followin…

    ... screen memory and the system variables, and can keep growing until ... CLEAR command is that all variables are reset, and must be ... re-allocated within the new space under RAMTOP - if there's ...
    joefish joefish September 2016 Sinclair Basic
  • Akalabeth gamei found now that someone ported an ansi-basic game (coded in 1979?) to msx-basic - what about a zx-spectrum basic version of it? ;) https://plus.goo…

    ... as there are too many variables.

    As it is ... to save time rather than space, relocating the code as near ...
    Battle Bunny Battle Bunny September 2016 Sinclair Basic
  • Startup colours of the Spectrum ROMHi Folks, Thought I would have a go at changing the startup colours of the Spectrum ROMs used within BasinC which ships with 48.rom (16384 bytes) …

    ... (@Memory[$1B33], $00ED);

    // Variables Window update traps

    space for SPECTRUM and PLAY.
    space.

    PutWord(@Memory[$1B44 ...
    Dunny Dunny October 2016 Development
  • RANDOMIZE USR, PRINT USR etcHello just wondering why is it called RANDOMIZE UsR what does randomising have to do with it ? When calling machine code routine from adress x you ty…

    ... on A, taking some space from the variables area. If you have ...
    Zup Zup October 2016 Sinclair Basic
  • ZX Spectrum CartridgesI have been thinking of "cloning" ZX Cartridges for a while (case, board and silicon skirt), to be able to make new releases or replace damaged cartr…

    ... printer buffer, or free stack space.
    However, I'm sure ... completely overwrite BASIC/ROM system variables, to use maximum memory, for ...
    RMartins RMartins October 2016 Hardware
  • How to get more than 21 UDG's in BASIC?So with graphics mode under the G cursor how many UDG's can you do from BASIC is it 21? It's all POKE 65368 and above and it's sequential ABCD.... an…

    ... BASIC using that memory for variables or something.

    My ... first printable character, ASCII 32 = SPACE, starts at 32*8=256 ...
    joefish joefish November 2016 Sinclair Basic
  • how to load machine codeI'm reading Jon Caldwell's how to write Spectrum games but can't enter the code! Here's an example:_ LD BC, (score) Call 6683 I tried putting…

    ... . This is the 'SYSTEM VARIABLES' area. It also sets ... .75K, then the system variables are stored, then the ... program will likely set up variables and arrays, and these ... sit within the 64K address space. In fact, when ... of the 64K addressable space. To use the full ...
    joefish joefish December 2016 Sinclair Miscellaneous
  • how to load machine codeI'm reading Jon Caldwell's how to write Spectrum games but can't enter the code! Here's an example:_ LD BC, (score) Call 6683 I tried putting…

    ... . This is the 'SYSTEM VARIABLES' area. It also sets ... .75K, then the system variables are stored, then the ... program will likely set up variables and arrays, and these ... sit within the 64K address space. In fact, when ... of the 64K addressable space. To use the full ...
    manicAlien manicAlien December 2016 Sinclair Miscellaneous
  • ZX GameDev tools consolidatedHello WoS! It's been a while, yet with a plenty of decent gamedev tools (including new ones!), is there a [i]single/pivot table[/i] or some datash…

    ... file :P Keeping all ram variables in one place is a ... much space that takes up and you can document what the variables ...
    Alcoholics Anonymous Alcoholics Anonymous January 2017 Development
  • Memory questionsQuestion 1: PRINT PEEK 23732+256*PEEK 23733 returns 65535 for a 48K Spectrum and 32767 for a 16K Spectrum. PRINT PEEK 16388+256*PEEK 16389 return…

    ... :

    [code]10 REM -{space}{space}T0
    POKE 16431,201 ... [/code]
    Remembering that BASIC variables are signed 16-bit integers ...
    GReW GReW March 2017 Sinclair Miscellaneous
<1…13141516171819…34>

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