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<1234567…34>
  • Who want to remake Double Dragon?Seeing as the Speccy version was crap (see my review: [url="http://www.gamestyle.net/retro.php?article=31"]http://www.gamestyle.net/retro.php?article…

    ... byte

    moving memory by push pop takes about a litlle ...
    Fikee Fikee July 2003 Games
  • Loadsa bullets on screen (silkworm)Did games like silkworm just draw everything to the screen or did they have complicated optimisations? and the types of games where sprites can occu…

    ... the destination is uncontended memory).
    A PUSH and a POP takes ... -to-back PUSHes into contended memory. And on top of that ... advantage is if you can PUSH each POPped value multiple times ...
    joefish joefish October 2017 Development
  • How many T-states takes PUSH DE ?Hi. Just a quick one. According to z80.info docs, a PUSH DE should take 11 T-States to be executed. But WHAT if SP is pointing to Contended Memory,…

    ... to z80.info docs, a PUSH DE should take 11 T ... SP is pointing to Contended Memory, specially to the display file ... ULA must access the video memory to generate the pic.
    AE.Vasconcelos AE.Vasconcelos April 2005 Development
  • Using the stack to copy memory blocksA [b]PUSH[/b] and a [b]POP[/b] instruction together take less time than two [b]LDI[/b], so long [b]POP/PUSH[/b] sequences are sometimes used to copy …

    ... requires several kilobytes of memory - it would be much ...
    push hl ; 11
    push de ; 11
    push bc ; ... br /> exx ; 4
    push bc ; 11 Subtotal = 54< ...
    ajmoss ajmoss August 2010 Development
  • Simple memory transfer routineI'm looking for a simple memory transfer routine that shifts 32 bytes of data from the address HL is set to 55143, I have tried using LDIR, but cant …

    ... 'm looking for a simple memory transfer routine that shifts 32 ... data minus 32
    loop push bc
    ld b,32 ...
    daveysludge daveysludge November 2013 Development
  • 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
  • 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 ...
    trellis trellis August 2003 Sinclair Basic
  • 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
  • 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 with ... the file stream, freeing the memory.
    I wrote another testing ... the complete file content in memory.

    The problem does ...
    Seejay Seejay April 2004 Development
  • 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
  • IM 2 interrupts and smooth scrolling - easy peasy!Okay, been fiddling around with IM 2 and have actually mastered (I think) how to use IM 2! Now I run my game Ragnar Revival in IM2 and use HALT to sy…

    ... it's probably much more memory space efficient to place the ... (16384)

    intfunc
    push hl
    ld hl,16384 ...
    ekoman ekoman 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
  • need help with speed optimization. this procedure draws a sprite with mask from memory onto the screen with x-coordinate in pixels. it doesn't shift sprites in realtime, it just uses …

    ... (4 kbytes
    long) from memory.

    Does anybody ... LD B,A
    PUSH HL
    PUSH BC
    DRAWBEG ;drawing ... sprite.
    DRAWEND
    PUSH BC
    EXX
    LD ...
    moroz1999 moroz1999 August 2004 Development
  • 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…

    ... sprites

    Spriteloop:
    PUSH BC

    CALL MoveSprite ... moving 256 bytes forward in 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] ; ***********…

    ... br />
    PUSH AF
    PUSH BC
    PUSH HL
    PUSH IX

    Spriteloop:
    PUSH BC

    ; Is ... moving 256 bytes forward in memory to FB0Ah
    LD ...
    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
  • Smooth Color Masked Sprites using fast page flip on 48kHere is a quick demo of using char based sprites using the Page flip method: a) Background is copied to buffer b) Sprites drawn on buffer c) Buffer …

    ...
    lp1:
    PUSH BC
    PUSH DE
    LD A ... /> DI
    PUSH AF
    PUSH BC
    PUSH HL
    PUSH IX
    MEMORY TO FB0AH
    LD ...
    robpearmain robpearmain September 2004 Development
  • Smooth Masked Sprites using fast page flip on 48k Part 2Ok, After all the suggestions in Part 1, which were all excellent (Thankyou), I opted on the following: I have 2 x 6k Offscreen areas (Yes, that's …

    ...
    PUSH AF
    PUSH BC
    PUSH HL
    PUSH IX
    PUSH DE ... MOVING 256 BYTES FORWARD IN MEMORY TO FB0AH
    LD H ...
    robpearmain robpearmain September 2004 Development
  • 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
  • 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
  • Fastest way to write something to screen$Hi, I just got pasmo.exe and start playing with attr scrolling, well, not scrolling, just write different values to a block and see if I can introdu…

    ... to fill a block of memory with 1 value ?

    push vs ld (hl),a.
    LOOP
    PUSH DE
    DEC BC
    AE.Vasconcelos AE.Vasconcelos April 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
  • Push/Pop methodMachine code question: Could somebody explain, how do we use the stack in assembler to copy data from one place of memory to another? I've heard it i…

    Machine code question:
    Could somebody explain, how do we use the stack in assembler to copy data from one place of memory to another?
    I've heard it is one of quickest methods, faster then e.g using ldir or writing a loop.
    Is it true?
    Ralf Ralf July 2005 Development
  • Optimisation Needed! Is this the Fastest way to copy bytes from screen and back again?I have the screen address (say 0,0 i.e 16384) I want to copy 4 bytes wide by 32 bytes high from the screen to an area of memory. I then want to cop…

    ... screen to an area of memory.

    I then want ... /> setup:
    di

    push iy

    ; Draw a ... ixh,32
    lp1:
    push hl

    ld a ...
    robpearmain robpearmain November 2005 Development
  • Interface 1 Memory Map(I'm not sure which section this post should go in, but here seems as good as any) Since the Interface 1 ROM is only 8k long, does anyone know what …

    ... appears in the 8-16k memory range when IF1 is paged ...
    MikeW MikeW May 2006 Hardware
  • Wanted: Gamecube memory cardI'm looking to buy a gamecube memory card. I don't need a large capacity memory card but a card that can save information for upto 3 games will do. I…

    ... looking to buy a gamecube memory card. I don't need ... a large capacity memory card but a card that ... they own or a used memory card (in working condition of ...
    Arjun Arjun May 2006 Chit chat
  • The Rocky Horror Show - Alternate version or just weak memory?Ok, I have a question that has been bugging me all my life... "The Rocky Horror Show" was the first game I have ever played, it was for some reason…

    ... a case of blurry child memory?

    And by the ...
    Fred_PJ Fred_PJ August 2006 Games
  • Emulator with ability to watch memory?Hi! I'm looking for an emulator that can give me a realtime update of an address in memory. I've tried Fuse (on OS X) where I can set a breakpoint i…

    ... update of an address in memory. I've tried Fuse (on ...
    bigredswitch bigredswitch August 2006 Emulators
  • Where do you keep your tape images? CD, DVD, USB drive or Memory Sticks?I have my most beloved games (well over 300 titles) on my SD memory card. What's your type of archive medium?

    I have my most beloved games (well over 300 titles) on my SD memory card. What's your type of archive medium?
    Uros Zupan Uros Zupan September 2006 Sinclair Miscellaneous
  • Memory Map/ContentionHi I'm new to speccy coding (well I did some z80 coding a few years back - like 20yrs ago :) ), and I'd like to get back into writing some scrolling…

    ... this a correct map for memory contention?

    Address Size ...
    5B00-7fff 08k Contended Memory
    8000-FFFF 32k Fast ... Memory (well normal memory really :) )

    Cheers ...
    ZJones ZJones September 2006 Development
<1234567…34>

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