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<1…19202122232425…34>
  • 128k Basic used much ?Hi - I was wondering if there were many,if any, games programmed in 128k basic? I was also thinking of doing one myself as I wish to make a text heav…

    ... proper way of accessing the ram disk.

    (god i ... some code and the return value will give you a good ...
    fog fog May 2013 Sinclair Basic
  • another faulty zx spectrum +2 to fix!!!Hello to all, I'm new here... I have got a faulty +2 (gray) and start to try fix it... I have read the treads of xaris_sm and Pluto63 as background…

    some little progress after rom ram test fitted in (with the ... two very hot ram installed)...

    this is ... correct? Can anyone read this value on a working unit?
    value on a working unit?
    emilen72 emilen72 May 2013 Hardware
  • Interface 1 bisOk, well the postmans just been and brought with him my new arrival, the Interface 1 bis. So as promised I thought I'd share some initial usage exper…

    ... interrupt ? Z80CPU need stable vector value #FF on data bus, because ... on zx bus can have unstable data bus and during IM2 ...
    velesoft velesoft May 2013 Hardware
  • Interface 1 bisOk, well the postmans just been and brought with him my new arrival, the Interface 1 bis. So as promised I thought I'd share some initial usage exper…

    ... interrupt ? Z80CPU need stable vector value #FF on data bus, because ... on zx bus can have unstable data bus and during IM2 ...
    Dan Antohi Dan Antohi May 2013 Hardware
  • Relocation with SDCCI desperately need auto- relocation with SDCC. Something that will compile all of my code using start address 0 and generate relocation table so that…

    ... array of arrays. Likewise, by-value copying of structs should not ... more to do with small ram of the 8051, which was ... bit processors with lots of RAM that don't run Windows ...
    Alcoholics Anonymous Alcoholics Anonymous June 2013 Development
  • DIVIDE PLUS - new memory mode DIVIDE128Divide PLUS contain 512kB sram + 512kB flash eprom. Memory paging in this device is enable on two different ports : 1) port #E3 is compatible with o…

    ... OUT (227),A ;connect divide ram page 3(memory ROW3) with ... LD A,30 ;value of last used ram page for DIVIDE128 mode ... 24576, length 8kB to divide ram
    DEC A
    value 2
    CP 0 ;value of first used ram page(- value ...
    velesoft velesoft June 2013 Hardware
  • Spike: 48k onlyDoes anyone know what's going on with Spike? [URL=http://s1142.photobucket.com/user/daveyboyhughes/media/spike_zps232a1745.gif.html][IMG]http://i114…

    ... 1) encrypted data, 2) some value(s) and 3) an operation ... responsible which also uses the RAM (starting at $5aff) as well ...
    Bandit Bandit July 2013 Games
  • Where do you stick the stack?...OK, so I've got a fair chunk of ASM code assembled from 24000 mark. The stack shouldn't get very big, just a few PUSHes and POPs of the main regis…

    ... free to choose its own value for SP.

    The ... is to define a low value for the RAMTOP and entire ... position is the top of RAM (65535 for 48 K Spectrum ...
    TK90XFan TK90XFan July 2013 Development
  • Poorly Issue One 16k spectrum diagnosis?Hello, everyone. :smile: I was lucky enough to buy an Issue One 16k rubber key the other week; I didn't know it was an Issue One till I opened it up…

    ... display data from the lower RAM. I encountered many variations of ... it while developing the lower RAM replacement module. Are you using ... problem by slightly increasing the value of the resistors in the ...
    Zorn Zorn July 2013 Hardware
  • Poorly Issue One 16k spectrum diagnosis?Hello, everyone. :smile: I was lucky enough to buy an Issue One 16k rubber key the other week; I didn't know it was an Issue One till I opened it up…

    ... display data from the lower RAM. I encountered many variations of ... it while developing the lower RAM replacement module. Are you using ... problem by slightly increasing the value of the resistors in the ...
    Trafferth Trafferth July 2013 Hardware
  • Poorly Issue One 16k spectrum diagnosis?Hello, everyone. :smile: I was lucky enough to buy an Issue One 16k rubber key the other week; I didn't know it was an Issue One till I opened it up…

    ... the unwanted artifacts are in RAM or are being created ... /> I agree with Zorn, the value of C8 is not critical ... should go for a higher value, e.g. if I ... fault) rather than a RAM fault as the spectrum system ... also stored in the lower RAM.

    You can ...
    1024MAK 1024MAK July 2013 Hardware
  • Issue 4A repair attemptI think I need some help. I have a nice Issue 4A main board here, which does not give out any video signal. I checked some voltages (the ones that se…

    ... , the coil, the entire lower RAM and TR4/TR5 all show ... guide I cannot see what value to expect on a certain ...
    schombi schombi July 2013 Hardware
  • Experimenting with turboloadersHello, My first post, having lurked here for a while. I'm a lifelong computer nerd, Spectrum fan since childhood in the eighties, and have recently…

    ... 're clear; then that value is put on port 254 ... the accumulator a random-ish value derived from E (the low ...
    ;; load pixels into screen RAM, backwards
    LD A,0x2B ... />
    ;; load attributes into screen RAM, forwards, without
    ;; an intervening ...
    stephenw32768 stephenw32768 July 2013 Development
  • Experimenting with turboloadersHello, My first post, having lurked here for a while. I'm a lifelong computer nerd, Spectrum fan since childhood in the eighties, and have recently…

    ... loader_read_edge";
    [*]the minimum value returned in B by .read_edge ... then blitted into video RAM, then the pixels are ... 0xfd00 ; last 768 bytes of RAM

    ;; start ... the beginning of the video RAM
    ret[/CODE]
    stephenw32768 stephenw32768 August 2013 Development
  • DivIDE black editions availableI have about 6 more DivIDE black editions ready, and will finish more this week. [B]DivIDE 57c BLACK edition including ESXDOS 0.8.5 and 1GB CF card[…

    ...
    8192-16383 = 8kB external ram.

    If PLUS D ... then [B]OUT #E7,any value[/B] = disconnect PLUS D memory ... )
    OUT #F7,xx send value xx to printer connector.
    value writed to port #FE (change ...
    velesoft velesoft August 2013 Sales
  • Hardware description - PLUS D interfaceThis new thread will contain onformations of different ZX devices. Some devices contain manuals, schematics or firmware for some chips, but some peop…

    ...
    8192-16383 = 8kB external ram.

    If PLUS D ... then [B]OUT #E7,any value[/B] = disconnect PLUS D memory ... )
    OUT #F7,xx send value xx to printer connector.
    velesoft velesoft August 2013 Hardware
  • Hardware description - MB-02+ interfaceOn this thread will soon released info about MB-02+ idisk interface ( memory paging mechanism, list of ports, addressing, MB IDE, schematics, etc... …

    ...
    Only 16kB rom/ram pages is supported.

    value (BIN 10000000 = connect ... is set to value (BIN 01000000 = connect ram page 0 ... and set paging port to value (BIN 10000000 = connect rom ... ZX rom external 16kB ram page number 7 with ...
    velesoft velesoft August 2013 Hardware
  • Hardware description - PLUS D interfaceThis new thread will contain onformations of different ZX devices. Some devices contain manuals, schematics or firmware for some chips, but some peop…

    ... utility. (detect if after HEX value/address is char "," and replace ... SAM COUPE... Here is 512kB ram for basic/data and make ...
    velesoft velesoft August 2013 Hardware
  • fire n iceHi does anyone have or know where i can get a tape version of fire n ice? it's the homebrew game of the sequel to solomons key, i think it was russ…

    TRD files can be loaded without problems on real ZX128 with DIVIDE (system ESXDOS). But this game is writed for fast ram (zx clones) and original ZX Spectrum models with 128kB use contended memory pages = game speed and ay music are unstable.
    velesoft velesoft August 2013 Wanted
  • Barn find #4I think this is some sort of backup device. Its got "007" on the motherboard and the mice have chewed the buttons. Will do a little research later in…

    ... a machine code program in RAM, one which disables maskable interrupts ... the FF hex floating bus value unless the ULA is accessing ... ROM SAVE routines to high RAM, then patch them so that ...
    1024MAK 1024MAK August 2013 Hardware
  • ZX Spin kicking up a strange errorDon't know if this is a 'strange' error or not, but it refuses to load certain Z80 files stating: [B][I]This Z80 file contains a block that decompre…

    ... version 1.45 packed the RAM as a single block which ... .45 these hold the PC value; for v2+ these hold zero ...
    Battle Bunny Battle Bunny September 2013 Emulators
  • Hardware description - MULTIFACE 128I make schematic of MULTIFACE 128 (v36) from PCB layers downloaded from WOS. But all PCB layers on WOS contain some bugs, absent signals, etc.. Now …

    ... MF128 contain 8kB rom + 8kB ram. Interface automatically save state of ... videoram number) in MF128. Saved value is changed only after OUT ... /> [B]OUT #3F,xx(any value)[/B] - enable MAGIC button + deactive ... /> [B]OUT #BF,xx(any value)[/B] - enable MAGIC button + ...
    velesoft velesoft September 2013 Hardware
  • Can a guy that traveled on the short bus learn machine code...Hmmm So after some soul searching I figured it was time to finaly nail spectrum machine code. Its so frustrating to sit infront of a basic listing w…

    ... semantics of [I]which[/I] value of PC you use (in ... choices - if you include the value after having read the third ... which add a value to PC, using the value after all bytes ... i can address 64k of ram or I/O. and they ...
    wibble wibble September 2013 Development
  • When is a 16k not a 16k ?Can anyone explain what this machine is supposed to be ? Speccy with a 16K sticker on the base. Doing a peek 23733 returns 255 so a 48K ? Opened …

    ... shown above and a different value for R60 (I think. It ... bodged to use OKI upper RAM (soldered in place), but I ...
    Zorn Zorn September 2013 Hardware
  • When is a 16k not a 16k ?Can anyone explain what this machine is supposed to be ? Speccy with a 16K sticker on the base. Doing a peek 23733 returns 255 so a 48K ? Opened …

    ... as 16K models' from the value of P-RAMT. This is ... not true. If the upper RAM is absent or completely faulty ... contents of P-RAMT. Any value of P-RAMT other than ... that faulty, but somewhat functioning RAM is present in the computer.
    Zorn Zorn September 2013 Hardware
  • Experimenting with turboloadersHello, My first post, having lurked here for a while. I'm a lifelong computer nerd, Spectrum fan since childhood in the eighties, and have recently…

    ... gotta remember to restore the value of shadow HL (and IY ... when writing into the video RAM? If so, that's another ...
    stephenw32768 stephenw32768 September 2013 Development
  • FREL Comcon Programmable Joystick Interface not working on 128k but on 48kAnother day, another problem :-) My FREL Comcon Programmable Joystick Interface [url]http://www.worldofspectrum.org/infoseekid.cgi?id=1000070[/url]…

    ... multiplex the video RAM. The Z80, ROM, upper RAM and edge connector ... one side, and the lower RAM and the ULA are on ... or low and override the value that the ULA placed on ... multiplexing logic for the contended ram so the resistors are no ...
    guesser guesser October 2013 Hardware
  • Clarification about Datel Genius MouseAlthough I found some threads about the Datel Genius Mouse, I still have some difficulties with it. Maybe someone can help me with these questions: …

    ... to 48basic with enable 128kB ram. Now you can load any ... ""....

    Also can be unstable IM2 vector. Some my modified ...
    velesoft velesoft October 2013 Hardware
  • SE Basic IV Buffy v4.1 source (WIP)I've been doing a major refactor on the SE Basic source and I'd appreciate a code review from anyone who has time to look at it. I've almost certainl…

    ... ; set stack to top of RAM
    call cold_start ; deal with ... /> dec e ; to top of RAM
    jp test_16k ; clear normal ... RAM in case of a hard ...
    ld sp, (err_sp) ; put value of err_sp in SP
    chev chev October 2013 Development
<1…19202122232425…34>

Latest Posts

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unstable 444 481
ram 12.6K 21.4K

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