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<1…12131415161718…34>
  • Is there an SNA halt bug?Hello all, I noticed that some SNAs don't work on my emulator but they do work in almost everyone else's, SPUD fails with them too which is a tad sp…

    ... a NEW and leaving 32k bytes of the program in memory ... R
    15 AF
    17 SP
    19 Interrupt mode ...
    John Elliott John Elliott April 2014 Emulators
  • Spectrum screen layoutSeeing the thread on displacement I was wondering why the spectrum had the stupid screen split into three sections and the addresses for each section…

    ... , the ULA reads four bytes of memory for every eight ... clock cycles, containing two bytes of pixel data (16 ... pixels) and two bytes of attribute data. To do ... that the two bytes within each pair of bytes must be ... 6, 22, 14, 30, 1, 17, 9, 25, 5, 21, 13 ...
    zub zub May 2014 Sinclair Miscellaneous
  • 30-column 8x2 multicolor (even in 48K)I don't recall any 8x2 multicolor routine for 30 columns that would work on all Spectrum models (including the Spectrum 48K), so I decided to write i…

    ... way but it's 2 bytes shorter per iteration, thus 24 ... *4*2=192 bytes shorter for the entire screen ... /> PUSH BC ; columns 16 and 17
    EXX
    PUSH IX ...
    Einar Saukas Einar Saukas May 2014 Development
  • Cool BASIC tricks and tips!Following on from Dunny's excellent suggestion of a compendium of BASIC tips + tricks, I believe it would be better to have a topic dedicated to it. …

    ... $ 19+CHR$ bf+CHR$ 17+CHR$ sp+CHR$ 16+CHR ... length of, say, 224 bytes, the above statement would need ... free RAM (plus the 80 bytes overhead required by TEST_ROOM) = ... $ 19+CHR$ bf+CHR$ 17+CHR$ sp+CHR$ 16+CHR ... 224+10 = 692 + 10 = 702 bytes. Which is rather more than ...
    Battle Bunny Battle Bunny July 2014 Sinclair Basic
  • Manic Miner loading screen adjustmentHad half an hour spare earlier and wanted to try a few things. Always like to learn anyways even now. [URL="http://www.yellowspider.co.uk/speccy/Man…

    ... copy the few loader code bytes (see below)

    LD ... pic (21280), middle of line 17 on the far left
    bytes) to 21280-21300 (20 bytes)

    JP ... I had to guess the bytes used.

    LD IX ...
    spider spider August 2014 Games
  • llvm-z80 statusFew months ago I read about efforts to produce llvm back-end for the Z80 (even perhaps as part of new z88dk). Any update on that? I found [URL="htt…

    ... /z80/asm_vfprintf_unlocked.asm?revision=1.17&view=markup"]vfprintf[/URL ... />
    which takes up three bytes, we do this:


    which takes 0 bytes. I think some linkers might ...
    Alcoholics Anonymous Alcoholics Anonymous September 2014 Development
  • Chuckie Ess 2 tap doesnt work[url]http://www.worldofspectrum.org/infoseekid.cgi?id=0000959[/url] It loads, you press a key and it returns to Basic! Anyone any idea why or got a …

    ... all but the last 256 bytes of RAM, so the Microdrive ... 243,221,33,0,128,17,17,0,62,0,55,205 ... ,5,221,33,0,64,17,0,191,62,255,55 ...
    richl richl September 2014 Infoseek database
  • Game of Life.Last year (I think) or maybe the year before, I entered a Game of Life simulator into the CSS CGC compo but for the Sinclair ZX81. I decided to port…

    ... $=" " THEN GO TO 12
    17 GO TO 13[/code]
    bytes

    RND: LD HL ...
    Battle Bunny Battle Bunny October 2014 Sinclair Basic
  • Game of Life.Last year (I think) or maybe the year before, I entered a Game of Life simulator into the CSS CGC compo but for the Sinclair ZX81. I decided to port…

    ... $=" " THEN GO TO 12
    17 GO TO 14

    Battle Bunny Battle Bunny October 2014 Sinclair Basic
  • Alkatraz Protection System - "How to" and compo?I'm thinking about writing a "how to" regarding the [URL="http://www.worldofspectrum.org/infoseekid.cgi?id=0020807"]Alkatraz Protection System[/URL].…

    ... : [unknown]
    ■ File length: 98223 bytes (680547 pulses), exploded: 9058609 (9222 ... => Program: *** LOMM * - Header: Length= 17, Pause=986ms.
    Block 2 ...
    jp jp November 2014 Announcements
  • Microdrive usageAnyone here know about microdrive files? Had a few carts in, all have stuff on, heres an example cat 1 with the error message i get for every single …

    Here's a composite of three routines from pages 16,32,35 of Andy Pennell's Microdrive book which combine to provide an extended Microdrive CAT.
    [code]1000 CLEAR 64999: GO SUB 8000: GO SUB 8350
    2000 GO SUB 8040: INPUT "Drive: ";d: GO SUB 5000: ...
    Battle Bunny Battle Bunny November 2014 Sinclair Miscellaneous
  • FZX: a new standard format and driver for proportional fonts[B]FZX[/B] is a very compact and efficient (although extremely flexible and powerful) standard format to create new fonts for the ZX-Spectrum. It sup…

    ... -07 11:05 PM 17,299 The_Jungle.c
    bytes. This would be the ... font "ff_ao_Orion" occupies 713 bytes in "fzx_reader_rodata_font_fzx.bin". The ... program itself is 452 bytes in "fzx_reader_code_compiler.bin". ...
    Alcoholics Anonymous Alcoholics Anonymous January 2015 Brand new software
  • GFX viewer from TZX/SnapshotsHello All, I use Spin .7 to view memory of games so I could find the GFX, but it's very buggy, does anyone know of something similar?

    ... it obvious which order the bytes were being read in each ...

    byte 1 byte 17 byte 33 byte 49
    byte 1 byte 9 byte 17 byte 25
    byte 2 ... /> byte 5 byte 11 byte 17 byte 29
    byte 6 ...
    rich_chandler rich_chandler January 2015 Emulators
  • Specbas new game PacmanWell I have been beavering away at this for a bit and I am now happy with it. (nearly) it's not bad (even if I say so myself) [img]http://i699.phot…

    ... .exe
    04/08/2013 17:10 18,020 specbas_sysfiles.zip ... File(s) 3,069,709 bytes
    [/COLOR]


    ewgf ewgf February 2015 Sinclair Basic
  • EmuZwin 128k banks in assembler Having looked at the assembler help file " ORG [{ RAMn | ROMn },] #target_address [, #dest_address ] Defines target assembling address and ta…

    ... from .tap file via LD-BYTES (with the 48K ROM1 ... br /> LD DE,17
    CALL $0556 ; LD-BYTES
    SCF< ... , ; could parse this from bytes 12 and 13 of header ... ;)
    CALL $0556 ; LD-BYTES

    DI
    ...
    dbolli dbolli August 2015 Emulators
  • 128K programmingDoes anyone know any good resources on assembly programming for the 128? All I'm after is an "idiot's-getting-started-guide" on how to utilise the…

    ... number plus 16, e.g. 17 for bank 1
    ... transferred in chunks of 6144 bytes each to avoid interfering ... ,16384 ; copies the first 6144 bytes
    LD DE,49152 ; ... bank 0 and all 16384 bytes of data have been ... not to exceed 11264 bytes of data instead of ...
    Alessandro Grussu Alessandro Grussu February 2016 Development
  • Are turbo loaders worth it?I found turbo loaders fascinating and I've spent quite some time disassembling and trying different types, and they work great when I load the games …

    ... load address) from +1 to +17 (IIRC) and then proceeds to ... inject a blank screen 6912 bytes into the screen area and ...
    nuggetreggae nuggetreggae March 2016 Development
  • ZX7: an "optimal" LZ77 packerAbout 20 years ago, I started a M.Sc. in Computing, planning to work on data compression. Although I quickly changed to another subject for a number …

    ... 17 (1 + 16).
    ; Data is transferred in chunks of 6144 bytes ... the last
    ; 768 bytes), thus avoiding screen corruption (colored ... ; copies the first 6144 bytes
    LD DE,49152 ... transferring all of the 16384 bytes
    LD BC,4096 ...
    Alessandro Grussu Alessandro Grussu April 2016 Brand new software
  • 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…

    [quote="slenkar;857988"]
    So using IX and IY is a bit more generic and easy but has a size and speed penalty?
    [/quote]

    It is easy but it's not always slower nor is it always bigger. If you can't hold the current working set of ...
    Alcoholics Anonymous Alcoholics Anonymous April 2016 Development
  • bin to tap with basicI have compiled some machine code to binary. How I can convert it to tap (or tzx, doesn't matter) with custom basic part? Of course, I can create …

    ... br />
    #code PROG_HEADER,0,17,headerflag
    defb 0 ; Indicates ... ; the block name, 10 bytes long
    defw variables_end-0 ...
    mister_wavey mister_wavey August 2016 Development
  • 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…

    ... t converted yet, these 17 numbers are referenced 1,283 ... than values saves 5 bytes for every 1-digit ... at 5840 + 690 bytes, less 161 bytes for the declarations = ... below, which uses 368 bytes. Using a bit of ... which uses 96 bytes. So 272 bytes have been saved on ...
    Battle Bunny Battle Bunny September 2016 Sinclair Basic
  • Must be missing the point - machine code... Hi Folks, Trying my hand at machine code again but falling at the first hurdle. I hand crafted the following to run at address 62000 and the co…

    ... L not zero $20 (-4 Bytes) $FC
    62012 INC H ... ; Next row of screen bytes $24
    62013 CPL ; Invert ... C not zero $20 (-10 Bytes) $F7
    62017 RET ; Return ... 0,12;"MSB";AT 0,17;"LSB";AT 0,22;"DEC ... +P
    260 PRINT TAB 17;P;TAB 22;D
    Paddy Coleman Paddy Coleman 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…

    ... 64 LD HL,32768
    17, 0, 128 LD DE,16384 ... LD HL,16384
    65347 17, 0, 228 LD DE,58368 ... LD HL,58368
    65359 17, 0, 64 LD DE,16384 ... />
    A screen is 6912 bytes, or 27 * 256. So you ...
    joefish joefish September 2016 Sinclair Basic
  • 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…

    ... ="joefish;880055"]Here's 12 bytes of machine code you can ... 64 LD HL,32768
    17, 0, 128 LD DE,16384 ... LD HL,16384
    65347 17, 0, 228 LD DE,58368 ... LD HL,58368
    65359 17, 0, 64 LD DE,16384 ...
    ivanb303 ivanb303 September 2016 Sinclair Basic
  • 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…

    ... =B). Then it comes across 17,0,228 which is LD ... third of the screen (2048 bytes starting at 18432) and ignore ... LD HL,18432
    65347 17, 0, 175 LD DE,44800 ... LD HL,44800
    65359 17, 0, 72 LD DE,18432 ...
    joefish joefish 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) …

    ... /> // unprotected.

    Memory[$0D2C] := $17;

    // $ED Unused Opcode ... /> // Now a trap at LD-BYTES, where we can get the ... [$2351] := 0; // That takes three bytes to NOP out a CALL ...
    Dunny Dunny October 2016 Development
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