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<1234567…34>
  • 128 Memory PagingI'm having a problem getting my brain around paging. Well, actually the bit I don't understand is how reading I/O ports works! I hope the collective …

    ... />
    Port 32765 controls the memory paging. Bits 0-2 determine ... ...


    AND 248 ;Reset bits 0-2
    OR ...
    trellis trellis August 2003 Sinclair Basic
  • memory is filled up under Win XP when opening many filesDear friends, I have the big and strange problem that ZX-Rainbow's game scanner is not working properly under Windows XP. I figured out (during a ti…

    ... in the virtual memory), so that the memory is filled up ... the file stream, freeing the memory.
    I wrote another ... the complete file content in memory.

    The problem ... Also with standard Pascal routines RESET/BLOCKREAD/CLOSE the same problem ...
    Seejay Seejay April 2004 Development
  • Screen display at resetJust something for curiosity: When the Spectrum is reseted by for example NEW a very typical screen is shortly displayed. [IMG]http://i33.tinypic.c…

    ... dots to the part of memory that is the display?
    reset that makes this happen?
    Rickard Rickard September 2009 Development
  • Intermittent reset on 48K (issue 4S)I'be been fighting an intermittent selfreset the whole day. Changed ULA - did not help. Tested TR6 as i could and compared the reading with another…

    ... and either get a self reset (most likelly) or a freeze ... error" i guess.

    Memory test runs find for a ...
    ArtemKuchin ArtemKuchin May 2012 Hardware
  • Velesoft's ZX128+2 with 1.5MB memoryMy old ZX128+2 PROFI (grey model - spanish version) for sale here: [url]http://aukro.cz/super-zx-spectrum-128-2-1-5-mb-i2738723874.html[/url] Back s…

    ... is active and you press reset, then start automatically FAT32 ... />
    - new reset circuit. Long and clear reset pulse is active ... power-on, after press RESET button and before power-off ... .

    - big 512kB memory rom is full reprogrammable direct ...
    velesoft velesoft October 2012 Sales
  • Compact Flash Card In "Memory Mode" - (Help)Hello my fellow WoS'ers I have been developing a Z80 8bit interface with a compact flash card port based on Pera's ZXCF "memory mode" interface for …

    ... based on Pera's ZXCF "memory mode" interface for the +2AB ... ] CSEL
    41 [ CF Card ] RESET
    50 [ CF Card ] GND ...
    Zetr0 Zetr0 January 2014 Hardware
  • 48K Upper memory issues?Having more issues with the 48K spectrum I just fixed that had the black screen in this thread [URL="http://www.worldofspectrum.org/forums/showthread…

    ... know work and they either reset the computer half way through ... end.

    Ran the memory test
    PRINT PEEK 23732 ...
    whoremoan whoremoan November 2014 Hardware
  • AGD memoryHow low has anyone got AGD memory showing but still works without crashing or errors. My Monty game is showing 30 and will not allow you to open any…

    How low has anyone got AGD memory showing but still works without crashing or errors.

    My Monty game is showing 30 and will not allow you to open any events to edit. If I add just one letter to any text it crashes big time, full reset.
    Dazman Dazman November 2014 Chit chat
  • ZX Evolution -- contended memory and raster emulationFresh bleeding update for [url=http://www.nedopc.com/zxevo/zxevo_eng.php]ZX Evolution[/url] [url=https://code.google.com/p/pentevo/source/list]Baseco…

    ... ] -- raster and ULA contended memory emulation for original 48k and ... new feature in his EVO Reset Service and fixing bugs ... some help with raster/contended memory

    Mike & ... very valuable insight into contended memory topic and useful discussions.< ...
    lvd lvd January 2015 Hardware
  • Help with a TIMEX TC2048 and memory problemBought a 2nd hand Timex TC2048 but unfortunately I detected a problem with the machine which is preventing it from working properly. I believe it …

    ... ou cause the machine to reset!


    Now, ... , placed sockets, inserted new memory chips and the result is ... br />
    Is this a memory addressing problem? The machine doesn ... 't "see" the memory?

    Where should ...
    Renegade Renegade December 2017 Hardware
  • AY musicThis is a format I'm proposing for an AY music player. If anyone can see any problems or anywhere it can be improved please say so. An AY music form…

    ... with the right values to reset it's variables.

    memory loaction offsets plus a final ... at the bottom of the memory 16k in the top page ... can be used at any memory location. Thus all the information ...
    cyborg cyborg October 2001 Sinclair Miscellaneous
  • Assembler code from tutorial, problem!I was wondering if anyone could help me decipher this z80 assembler code? ORG 60000 LOAD 60000 EA60 21BCEA LD …

    ... (HL),A ;replace digit in memory
    EA68 FE8A CP 8AH ... /> EA6C 3680 LD (HL),80H ;reset digit to zero
    EA6E ...
    Duxbuz Duxbuz August 2001 Sinclair Miscellaneous
  • Machine Code ChallengeHere's a challenge for all you Z80 programmers. Points to be awarded for elegance and brevity. (I haven't got the solution either) HL addresses the …

    ... number of contiguous bytes in memory the number of bytes being ... make it difficult, the first reset bit encountered is not to ...
    Geoff Geoff July 2002 Sinclair Miscellaneous
  • ANN: Spectaculator 2.5 available for downloadHi. I've just released a new version of Spectaculator, available from [url="http://www.spectaculator.com/"]http://www.spectaculator.com/[/url]. Hopef…

    ... />
    - 'View Cassette recorder' and 'Reset the Spectrum' are available on ...
    toolbar.

    - Poke Memory option on Tools menu.
    Jon Needle Jon Needle July 2002 Emulators
  • Memory usageBrowsing the online documentation for the Spectrum I came across a peculiar discrepency. As we all know the start of the RAM is at 16384 which is whe…

    ... is where the screen memory resides. The screen memory ends at 23296 ... is what on earth the memory before KSTATE and after the ... video memory is used for on a ...
    cyborg cyborg November 2002 Sinclair Miscellaneous
  • Spectrum +2 problem...I've just had a Spectrum go down on me (not that way TK, so don't try it...) I was playing a game with no problems for about 20 minutes, and the Spe…

    ... Spectrum (original +2) crashed. I reset the machine, but now it ... .

    Every time I reset, it does something different. I ... it's saving something from memory. Other strange things happen too ...
    chaosmongers chaosmongers August 2003 Sinclair Miscellaneous
  • ZX80/81 memory expansion and 48k + Lightpen for saleAll are in original packaging and the lightpen has it's software and manual. The memory expansion is a 16k one. E-mail me at [email="patrick@wych01…

    All are in original packaging and the lightpen has it's software and manual.

    The memory expansion is a 16k one.

    E-mail me at [email="patrick@wych01.freeserve.co.uk"]patrick@wych01.freeserve.co.uk[/email] if intrested..
    zeropolis79 zeropolis79 September 2003 Sales
  • Spectrum spares / repair jobsI recently bought a few faulty Spectrum 48+'s and have built a fully functional unit from the best bits of them, however this has left me with two pa…

    ... the cable and it'll reset) and the other has a ... a few odd keys (from memory I think they are extended ...
    BuzzinRich BuzzinRich November 2003 Sales
  • [NEW]: Spectaculator 6.0Spectaculator is a Sinclair ZX Spectrum emulator for PCs running Windows 95, 98, ME, NT 4, 2000 and XP. Spectaculator emulates the 16K/48K/128K/+2/+…

    ... />
    - Autoboot facility to automatically reset the Pentagon/Scorpion and
    (little-endian) in main memory.

    - Displays can be ... and data from either main memory or a
    specific RAM ...
    Jon Needle Jon Needle December 2003 Emulators
  • Memory Available for 16k and 48kAm I right in thinking that if I am writing a 16k Game, I have 8k available for the machine code prog 6000h to 8000h, and for a 48k game I have 40K a…

    ... /> If so, what are the memory areas available for 16k and ...
    robpearmain robpearmain May 2004 Development
  • Pentagon interface news from VELESOFTIt's from Xagon's board. It is about new interface for Speccy - it make Your comp compatible with Pentagon (and not only) and also it gives You up t…

    ... version expands the ZXS 128 memory to 512kB,
    includes ... />
    - Pentagon 512kB mode (all memory is fast)
    Higher RAM ... /> The extended memory is of course not erased after reset and
    complete image (.TRD) into memory and swith on TRDOS.
    Yerz Yerz June 2004 Sinclair Miscellaneous
  • InterruptsA small piece intended for the FAQ. Comments, corrections, additions welcome. Notably: * How long does the 48K ULA hold /INT low? * What happens i…

    ... the EI, it will be reset.

    When ... details on IFF2) are reset and the current value ... from the data bus. The memory at location 256 * I + ... is accepted, IFF1 is reset, but IFF2 is left ... was zero (thus causing a reset). However various peripherals, most ...
    Philip Kendall Philip Kendall July 2004 Development
  • Strange layout of Spectrum video memoryHello, does anyone have an idea why the Spectrum's video memory has such a strange layout? I understand that a resolution of 256x192 is an easy mean…

    ... why the Spectrum's video memory has such a strange layout ... it easier to address video memory. I also understand that the ... ) are a compromise to limited memory. But where does the line ...
    J?rg Pleumann J?rg Pleumann August 2004 Sinclair Miscellaneous
  • Machine Code Sprites Example Code Using Char Based SystemBelow is my WIP code to do smooth screen wrapping sprites using char positions and offsets, as opposed to writing direct to a line (0-191) and shifti…

    ... />
    LD (IX+2),0 ; Reset x offset to 0
    memory to FB0Ah
    LD H ...
    robpearmain robpearmain August 2004 Development
  • IM2 Machine Code Sprites Example Code Using Char Based SystemFurther to my earlier post, here are sprites running using char method with IM2 driving it Note, for 48k spectrum using TASM [code] ; ***********…

    ... anim frame until target reached, reset to 0

    LD ... />
    LD (IX+2),0 ; Reset x offset to 0
    memory to FB0Ah
    LD H ...
    robpearmain robpearmain August 2004 Development
  • what extra port for extra memory ? (256K, 512K, 1024K, etc.)I know that Pentagon uses some extra bits from port 7FFD for extra memory pging: - for 512K model, bit 6 & 7 of port 7FFD - for 1024K model, bit 5, 6…

    ... from port 7FFD for extra memory pging:
    - for ... those bits for extra memory switching and if it ... / port DFFD for extra memory paging.
    What is ... keep track of a memory bank number, by combining ... established port for extra memory, other than the Pentagon ...
    secarica secarica September 2004 Sinclair Miscellaneous
  • SPIN - debugger / fill memory / how ?I try to fill the screen with 00 value, but I don't get the expected result. - pause the game - debugger - hex numbers - fill memory block - fill wi…

    ...
    - hex numbers
    - fill memory block
    - fill with 00 ...
    - main memory
    - start address - 4000
    - ok
    then
    - view memory
    - all screen data is ...
    secarica secarica October 2004 Emulators
  • Announce: EmuZWin 2.5 Release 2.2 Post-FinalEmuZWin Version 2.5 Release 2.2 post-FINAL (16-Oct-2004): [-] A small pause added between TAP blocks while loading tape from .TAP image (otherwise s…

    ... emulated prog uses mouse and reset Spectrum by itself (e.g ... some disk commanders).
    [-] Loading memory block in the Dubugger did ... in the catalog did not reset video page to 0. Fixed ...
    Vladimir Kladov Vladimir Kladov October 2004 Emulators
  • Data at the top of memoryWhilst viewing memory locations on the "Spin" emulator I noticed data starting at 65336. Does a "real" ZX Spectrum 48k use the top end of available m…

    Whilst viewing memory locations on the "Spin" emulator I noticed data starting at 65336. Does a "real" ZX Spectrum 48k use the top end of available memory ? If so, what is the last memory location that is safe to use ?
    Mr Millside Mr Millside February 2005 Development
  • Emulator Dev: Memory Use When Loading RZXsHi, I am currently working on a port of an emulator to a system with limited memory (64mb). I am running out of memory when loading large snapshots …

    ... to a system with limited memory (64mb). I am running out ... of memory when loading large snapshots (ie ... let me know how much memory is needed to decompress a ...
    Crabfists Crabfists June 2005 Emulators
<1234567…34>

Latest Posts

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  • Memory usageBrowsing the online documentation for the Spectrum I came across a peculiar discrepency.<br /> As we all know the start of the RAM is at 16384 which …
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