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<1…12131415161718…34>
  • The Programmers Development System (PDS)Hi everybody, I recall this system has been mentioned several times on WoS forums. Last time was, I think, when those sources from Maz Spork (Buggy …

    ... and with no larger value than 16384. I found ... ; --------------------------------------------------------------------------


    ; Display RAM.


    if 1 ... br />

    ; ULA shared RAM.


    contended defs ...
    ASM ASM October 2010 Sinclair Miscellaneous
  • Do ULAs die?Thought I'd start this thread as people often think their ULA is dead, when it's actually the RAM or power circuits. Searching the forum in the futur…

    ... would say that RAM was alternating between the value 20h (00100000b) and ... means one of the two ram chips for the top 64k ... idea which of the 4 ram chips these are.
    spodula spodula October 2010 Hardware
  • Alien8 will not run on Divide?I can't seem to get Alien8 running on my 128+ with Divide. I have the original tape and have loaded into an emulator to create a snapshot, (.z80) an…

    ... why... This OUT command write value #7F,#7E or #00 to ... with black screen and switch ram to 48kB mode...

    velesoft velesoft October 2010 Hardware
  • Games in machine codeHi everyone, How do go about doing multiple shots like a machine gun, do you have to store every x and y position of each bullet? When you kill som…

    ... WRKRAM 0x00000000 ~ 0x001EFFFF 0x001F0000 Work RAM.
    HWBASE 0x001F0000 ~ 0x001FFFFF 0x00010000 ... list entry

    Value Description Value Description
    0000 Width / height ... - DISCTRL

    Name Value Description
    PF0MD 0 Playfield ...
    ASM ASM October 2010 Development
  • Whole upper memory lostHi! I own a rubber key Spectrum with 48K RAM. Suddenly it lost it's whole upper memory. All diagnostic programs says that it's 16K model with workin…

    ... that's just a failed RAM chip, or perhaps a ... bad contact between a RAM chip and the IC ... each poke compare read-back value with what you just poke ... , and schematic shows which RAM chip corresponds what that bit ... (s). Re-socket that RAM chip a few times in ...
    RetroTechie RetroTechie October 2010 Hardware
  • Whole upper memory lostHi! I own a rubber key Spectrum with 48K RAM. Suddenly it lost it's whole upper memory. All diagnostic programs says that it's 16K model with workin…

    ... PEEK 32768 and i got value 1. It's 00000001 ... be sure, POKE the same value (0) to other locations ... as well, or any other value.

    [QUOTE=lillaolle64 ... RAS/CAS circuit inside the RAM, or the tri-state ... left "floating" and the value of a floating data bit ...
    mcleod_ideafix mcleod_ideafix October 2010 Hardware
  • Whole upper memory lostHi! I own a rubber key Spectrum with 48K RAM. Suddenly it lost it's whole upper memory. All diagnostic programs says that it's 16K model with workin…

    ... be sure, POKE the same value (0) to other locations above ... as well, or any other value.[/QUOTE]
    That's only ... a possible failure mode for RAM chip and/or circuit board ... is enough to declare a RAM chip failure. Since in order ...
    RetroTechie RetroTechie October 2010 Hardware
  • Games in machine codeHi everyone, How do go about doing multiple shots like a machine gun, do you have to store every x and y position of each bullet? When you kill som…

    ... PCs have stupid ammounts of RAM - 3GB for example it should ... develop for 512MB to keep RAM usage under control.

    value and catalog returns nearest KB ...
    ASM ASM October 2010 Development
  • Learning Assembly LanguageHow easy would it be to learn assembly language for someone who has a decent grasp of Basic? I mean how long do you think it would take before I coul…

    ... ; Origin at start of uncontended RAM.


    ; --------------------------------------------------------------------------

    ld d,0 ; Value to write to screen
    ld d,7 ; Value to write to attributes
    ASM ASM October 2010 Development
  • divide deviceHi, This is first my first post,so hello to you all I first Spectrum 48k was a Xmas present way back in 1983,best gift ever. Then I moved on to a C…

    ... interface with external memory rom/ram or old kempston joystick ... 1MB (512kB rom + 512kB ram) with MB02 compatible paging. This ... same time to data bus value with joystick state = collision ... connection of external memory rom/ram on all devices connected ...
    velesoft velesoft November 2010 Hardware
  • divide deviceHi, This is first my first post,so hello to you all I first Spectrum 48k was a Xmas present way back in 1983,best gift ever. Then I moved on to a C…

    ... interface with external memory rom/ram or old kempston joystick interfaces ... are mixed and this incorrect value is writed to DIVIDE PLUS ... connection of external memory rom/ram on all devices connected to ...
    Alien 8 Alien 8 November 2010 Hardware
  • Fast AY PlayerThis is player for ay register dump stream (compiler for PC included). Speed: 980..1067t / 1200..1287t (without pattern change/with pattern change) …

    ... ... Before clicking compile, change its value to something lower, like 64 ... of avoiding the out of ram message when compiling the PLAYER ...
    kgmcneil kgmcneil November 2010 Development
  • Fast AY PlayerThis is player for ay register dump stream (compiler for PC included). Speed: 980..1067t / 1200..1287t (without pattern change/with pattern change) …

    ... />
    First, compiler calculates the value taken for the registers r0 ... />
    If you getting the "RAM limit exceeded 65536" error message ...
    tmk79 tmk79 November 2010 Development
  • 48k Out of memoryIv just had a 48k Speccy arrive today. The keyboard wasnt working right so I changed that. Now when I tried to load Cyclone it started to load ok fo…

    ... off the shelf replacement RAM but you have to ... work out what type of RAM your Spectrum currently has. ... the upper 32K of RAM. Each RAM chip holds one bit ... two of the eight RAM chips require replacing so ... then the value you do get would suggest which RAM chip ...
    BloodBaz BloodBaz November 2010 Hardware
  • Genesis: dawn of a new day, new game from RetroWorks!It's been a long development, but finally we made it. We proudly present the latest game from RetroWorks, Genesis: dawn of a new day. [img]http://ww…

    ... from data bus 8bit vector value. Pull-up resistors in ZX ... time, but practicaly this value can be unstable if any external hardware ... via resistors to data bus value #FF (via resistors only = better ...
    velesoft velesoft November 2010 Games
  • Learning Assembly LanguageHow easy would it be to learn assembly language for someone who has a decent grasp of Basic? I mean how long do you think it would take before I coul…

    ... ; Origin at start of uncontended RAM.


    ; --------------------------------------------------------------------------

    ld d,0 ; Value to write to screen
    ld d,7 ; Value to write to attributes
    sekrets sekrets November 2010 Development
  • How to clean up video output to TFT LCD - Spectrum 48kHi, I hope that there is an easy answer to this question. I have modded the RF socket on my 48k Spectrum to output composite video as described in t…

    ... receiving equipment.

    Capacitor value (in combination with 75 Ohm ... ]and a shot of the RAM chips that I removed becuase ...
    RetroTechie RetroTechie November 2010 Hardware
  • Learning Assembly LanguageHow easy would it be to learn assembly language for someone who has a decent grasp of Basic? I mean how long do you think it would take before I coul…

    ... ; Origin at start of uncontended RAM.


    ; --------------------------------------------------------------------------

    ld d,0 ; Value to write to screen
    ld d,7 ; Value to write to attributes
    ASM ASM November 2010 Development
  • Problem with se basicI use MB02 memory paging (ram 16kB instead 48rom) and via one OUT 23,xx can switch between original 48 rom and SE ROM. But if I write basic program i…

    ... at adress #FFFF on ZX ram. Value xxxx are readed from rom ...
    velesoft velesoft December 2010 Sinclair Basic
  • Recent talk of developing new SpectrumsHi all, I can see from a few threads on here that some Wossers like Vasil and Aien 8 are interested in developing more powerful Spectrums or improvi…

    ... maximum resolution of 256x192? original RAM and CPU limitations?[/QUOTE]
    RAM etc), quartz crystals come in ... number of popular frequencies (popular value = cheap quartz), etc, etc. Throw ...
    RetroTechie RetroTechie December 2010 Hardware
  • zx spectrum +2 troubleshootingHi There I am new here and I need some advise as to where to look for issues on my zx spectrum +2 it was working fine this morning .. then while pl…

    ... ram bank. of my +2 grey, POKE 32768,0 returned a value ... 24 were the non-contended ram chips and IC 24 likely ... faulty one. Piggybacking a good ram chip over IC 24 confirmed ...
    john58 john58 December 2010 Hardware
  • Loading a screen in to memory...Hi Folks, I want to load a SCREEN$ in to memory and save it out to RAM disk without it being displayed on the screen. I am worried about over writi…

    ... you want to use the RAM disk, it's better ... give the variable the proper value.

    Then, ... [code]9000 REM SAVE TO RAM DISK
    9001 IF is128 ...
    9010 REM LOAD FROM RAM DISK
    9011 IF is128 ... 1000 bytes block to RAM disk from address 50000 ...
    na_th_an na_th_an December 2010 Sinclair Basic
  • Loading a screen in to memory...Hi Folks, I want to load a SCREEN$ in to memory and save it out to RAM disk without it being displayed on the screen. I am worried about over writi…

    ... you want to use the RAM disk, it's better to ... give the variable the proper value.

    Then, everytime you ... /> [code]9000 REM SAVE TO RAM DISK
    9001 IF is128 ... />
    9010 REM LOAD FROM RAM DISK
    9011 IF is128 ...
    Paddy Coleman Paddy Coleman December 2010 Sinclair Basic
  • Screen$ command, ROM routineHi All, Does anyone know which ROM routine to call for the Screen$ command (and/or the ATTR command)? Any comments on how well it works or the spee…

    ... speed compared to a homemade RAM one?

    It's ... />
    SCREEN$ will store the value on the stack and you ... must get the value from it.

    I ...
    Dr BEEP Dr BEEP January 2011 Development
  • Fuse: what do you want to see?An open brainstorm. If you had a team of programmers working on [url=http://fuse-emulator.sf.net/]Fuse[/url], what would you tell them to work on? …

    ... system variables with a random value before LOADing a game, as ... state of the Spectrum's RAM + registers +whatever to the PC ... 's RAM every half-second or so ...
    ewgf ewgf January 2011 Emulators
  • Platformer BAS file?Does anyone have an example of a platformer in BASIC? Specifically one that uses drawn sprites, etc.

    ... you want to use the RAM disk, it's better ... give the variable the proper value.

    Then, ... [code]9000 REM SAVE TO RAM DISK
    9001 IF is128 ...
    9010 REM LOAD FROM RAM DISK
    9011 IF is128 ... 1000 bytes block to RAM disk from address 50000 ...
    na_th_an na_th_an January 2011 Sinclair Basic
  • Some TAP files not working on DivIDEOne of the people who ordered a DivIDE from me told me het can't load certain TAP files, which load perfectly on emulators. I have encountered that …

    ... /divide_57c_top.jpg[/url]

    Value of resistors R4,R5,R7 ... is erased system in DIVIDE ram and after power-on start ...
    velesoft velesoft January 2011 Hardware
  • +2A/+3 compatibility fixes thread!It might be a good idea to keep these fairly common +2A/+3 compatibility fixes (and requests) in a single thread for quick reference ;) Let's start …

    ... /> ; $7FFD (Out) - Bits 0-2: RAM bank (0-7) to page ... a copy of the last value written to port $7FFD
    jp jp January 2011 Games
<1…12131415161718…34>

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