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<1…17181920212223…34>
  • Some thoughs about fast scrolling on 128 modelPlease, consider this article as technically interesting concept not a proven algorithm. ONE The fastest scrollers use long sequence of PUSH inst…

    [QUOTE=joefish;707054]Also a PUSH takes 11 cycles, or 16 ... uniformly (counter updates etc), the memory itself only produces contention when ... of +5 tacts per each PUSH is highly conservative. In my ... tacts of delay per screen memory access. Using words halves this ...
    introspec introspec June 2013 Development
  • Some thoughs about fast scrolling on 128 modelPlease, consider this article as technically interesting concept not a proven algorithm. ONE The fastest scrollers use long sequence of PUSH inst…

    ... /> PUSH HL
    is the most efficient way of filling the memory ... use
    LD HL, xx : PUSH HL
    all the time ...
    introspec introspec June 2013 Development
  • Fantasy Z80 instructions?This follows on from something catmeows said in another thread, and that I've been meaning to ask for a while. This may sound daft to people with mo…

    ... index registers than push/pop. It avoids unnecessary memory access if you ...
    u6c87 u6c87 June 2013 Development
  • Some thoughs about fast scrolling on 128 modelPlease, consider this article as technically interesting concept not a proven algorithm. ONE The fastest scrollers use long sequence of PUSH inst…

    ... executed in a non-contented memory. So we only worry ... accessess to screen memory during the screen drawing using PUSH we should ... can be developed further. The memory is only contended during the ... delays in average (when using PUSH), which seems to correspond ...
    introspec introspec June 2013 Development
  • Some thoughs about fast scrolling on 128 modelPlease, consider this article as technically interesting concept not a proven algorithm. ONE The fastest scrollers use long sequence of PUSH inst…

    ... executed in a non-contented memory. So we only worry ... accessess to screen memory during the screen drawing using PUSH we should ... instance, if you execute another PUSH immediately after this, it ... can be developed further. The memory is only contended during the ...
    Einar Saukas Einar Saukas June 2013 Development
  • 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…

    ... once they're loaded into memory. A typical scheme is 1 ... : ld sp, $5fb4
    5b3d: push hl
    5b3e: ld hl ...
    Bandit Bandit July 2013 Games
  • SkoolKit 3.4SkoolKit - a suite of utilities for creating disassemblies of Spectrum games in HTML (and ASM) format - has reached version 3.4. Some of the new stuf…

    ... the data so that each memory address takes a nibble rather ... instance, marking addresses accessed with PUSH/POP would be useful to ...
    Einar Saukas Einar Saukas July 2013 Announcements
  • Full 16*16-digit BASIC multiplicationI liked Andre Adrian's 32-bit long multiplication routine so much that I decided to a decimal version. After all, 2^63 is only 9223372036854775808, a…

    ... them to be adjacent in memory. It just looks for the ... ;HL=$106E
    push hl
    push de
    push bc
    ld ... /> gsRR: ; 900 REM RR
    push hl ;save decimal register address ...
    Battle Bunny Battle Bunny July 2013 Sinclair Basic
  • 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…

    ... loaded byte is stored in memory.
    ;; D: a bitmask ... ; decrement data length
    push bc ; save new data length ... br />
    .verify_checksum:
    push bc ;exit code assumes data ...
    stephenw32768 stephenw32768 August 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…

    ... />
    ;; start loading into high memory
    ld ix,.attrs
    ;; is important
    push de
    ;; move attrs into ...
    stephenw32768 stephenw32768 August 2013 Development
  • 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…

    ... running multicolor 8x1 from contended memory:

    [CODE] ; ... nn
    ; 15952T
    PUSH HL ; columns 11 and 12 ... nn
    ; 16000T
    PUSH HL ; columns 9 and 10 ...
    Einar Saukas Einar Saukas August 2013 Development
  • melbourne drawIt could be said I am easly pleased,:grin: Very nice peice of software. I was realy impressed by its ease of use. I think a lot of time and effort w…

    ... soon gives an "Out of memory" error otherwise as SP is ... /> ld bc,$fe00
    LOOP1: push bc
    ld a,b ... bc
    djnz LOOP1
    push bc
    RETADD: ret ;reset ...
    Battle Bunny Battle Bunny August 2013 Development
  • 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…

    ... already cleared that part of memory before but I figure its ... chance.

    Next we push whatever value we want into ...
    wibble wibble August 2013 Development
  • JSW2 - Game Loader DifferencesThere are three official releases of JSW2. I'm not counting the 'JSW2-128' version here as far as I'm aware this was not in any way 'official' as it …

    ... from 4EDDh onward (after the memory image has been decrypted):
    LD BC, 64h ;AF
    PUSH BC
    LD A,3Fh ... /> LD BC, 614h ;AF'
    PUSH BC
    POP AF
    LD SP, 5FFDh ;SP
    PUSH AF
    LD A, 24h ...
    John Elliott John Elliott September 2013 Sinclair Miscellaneous
  • Clashbasher a new interface to reduce colour clashI've been working on this for a while now. [IMG]http://markamy.uwclub.net/cauldron.JPG[/IMG] Basicly its an add on for a 48k spectrum, which reinte…

    ... as push which writes 2 bytes in quick sucsession to memory. The ...
    Basher Basher September 2013 Hardware
  • Finders Keepers+I know a few of you are interested in this project so I thought it was about time I started a proper thread for it rather than just slipping bits int…

    ... should go away if you push against it by trying to ... in the shops. My abiding memory of Knight Tyme was getting ...
    bon got ron bon got ron September 2013 Development
  • IF1bis StabilityI just thought I would start a different thread relating to the IF1bis, and leave the copyrighters to it elsewhere...:-P I've had mine for a few mon…

    ... consider flash for non volatile memory.
    [/QUOTE]

    This ... the push of a button.


    In other words: Memory ...
    Dan Antohi Dan Antohi September 2013 Hardware
  • BandersnatchI have recently viewed the 1980's programme 'Commercial Breaks: Battle For Santa's Software' about Imagine in the early 1980's and their ill-fated Ba…

    ... . Back in those days the memory chips were quite big and ... upright boards must have been memory. The flat board has a ... this to be a simple memory switcher. This would make sense ... +3 would have been a push though being 170K floppy drive ...
    wiper2001 wiper2001 October 2013 Hardware
  • A few questions about ZX Spectrum assemblyHi, I have a few questions about ZX Spectrum assembly language programming: - What's the best assembly tool for ZX Spectrum? I tried a bit the ZXSpi…

    ... find the code in the memory.
    My program was:

    If I push the "Assemble" button, the emulator ...
    Zerg Zerg October 2013 Development
  • A few questions about ZX Spectrum assemblyHi, I have a few questions about ZX Spectrum assembly language programming: - What's the best assembly tool for ZX Spectrum? I tried a bit the ZXSpi…

    ... find the code in the memory.
    My program was:

    If I push the "Assemble" button, the emulator ...
    spectrumlinux spectrumlinux October 2013 Development
  • Copy 4Kb in Assembly?Here's an interesting problem: what's the best way to copy a block of 4Kb in assembly? The most obvious solution is to use [B]LDIR[/B]: [CODE] l…

    ... previous post assumes uncontended memory. If using contended memory (for instance copying ... "rolled loop" sequence of [B]PUSH[/B]es above would have ... "rolled loop" routine so [B]PUSH[/B]es are executed during ...
    Einar Saukas Einar Saukas October 2013 Development
  • Copy 4Kb in Assembly?Here's an interesting problem: what's the best way to copy a block of 4Kb in assembly? The most obvious solution is to use [B]LDIR[/B]: [CODE] l…

    ... /> LD HL,NN
    PUSH HL
    LD HL,NN ...
    PUSH HL
    LD HL,NN ...
    PUSH HL
    LD HL,NN ...
    PUSH HL
    LD HL,NN ...
    PUSH HL
    ...[/QUOTE]
    ... have 2 blocks of memory and a copying routine ...
    Ralf Ralf October 2013 Development
  • Copy 4Kb in Assembly?Here's an interesting problem: what's the best way to copy a block of 4Kb in assembly? The most obvious solution is to use [B]LDIR[/B]: [CODE] l…

    ... "rolled loop" [B]PUSH[/B] I listed above would ... memory (except on Spectrum +2A/+3). Moreover, the "rolled loop" [B]PUSH ... use "rolled loop" [B]PUSH[/B]. And if your program ... of "rolled loop" [B]PUSH[/B] during screen scan ... such that all [B]PUSH[/B]es are always ...
    Einar Saukas Einar Saukas October 2013 Development
  • Copy 4Kb in Assembly?Here's an interesting problem: what's the best way to copy a block of 4Kb in assembly? The most obvious solution is to use [B]LDIR[/B]: [CODE] l…

    ... "rolled loop" [B]PUSH[/B] I listed above ... memory (except on Spectrum +2A/+3). Moreover, the "rolled loop" [B]PUSH ... is still preferable to PUSH though, like when ... "rolled loop" [B]PUSH[/B]. And if your program ... "rolled loop" [B]PUSH[/B] during screen scan ...
    chev chev October 2013 Development
  • Copy 4Kb in Assembly?Here's an interesting problem: what's the best way to copy a block of 4Kb in assembly? The most obvious solution is to use [B]LDIR[/B]: [CODE] l…

    ... /> push bc
    push de
    push hl
    exx
    push bc
    push ... de
    push ... /> It seems another compromise between memory and speed but I'd ...
    Ralf Ralf October 2013 Development
  • 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…

    ... ; error if out of memory
    ret ; end of ...
    l_numeric:
    push hl ; stack destination pointer
    push de ; stack pointer to ... pointer to existing
    push bc ; stack length of ...
    chev chev October 2013 Development
  • 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…

    ... and discriminator byte
    push bc ; stack parameter
    push hl ; re-stack counter ... error if out of memory
    push de ; stack element ... total
    push bc ; stack counter
    push hl ; ...
    chev chev October 2013 Development
  • 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…

    ... defw x80_fst ; store in memory
    defw x80_fgt ; ... />
    ; THE 'MEMORY LOCATION' SUBROUTINE
    org 0x3469 ... memory area

    org 0x3475
    x80_fgt_2:
    push ... MEMORY AREA' SUBROUTINE
    org 0x3483
    x80_fst:
    push ...
    chev chev October 2013 Development
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