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<1234567…34>
  • 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…

    ... ; setup workspace
    call cls_lower ; clear lower screen
    res 5 ... ; immediate jump

    ; THE 'CLEAR-SP' SUBROUTINE
    org 0x1185
    chev chev November 2013 Development
  • Games cracking...A question for the crackers out here.... What was your very first game you cracked and for how long were you 'in clouds' of it? My very first progr…

    ... saw it needed a CLEAR to change SP).

    I have ...
    Dr BEEP Dr BEEP August 2001 Games
  • Smooth Screen Scrolling RoutineHi everyone, this is a follow up to the thread on smooth screen scrolling. As promised here is the code for the routine. It's pretty long and fairl…

    ...
    LD (SPMOD+1),SP ;preserve stack pointer
    < ... )

    LD SP,HL
    EX DE,HL ... /> CLEARLP2 LD L,E ;clear each column
    LD (DE ...

    PUTBLOCK LD SP,HL
    EX DE,HL ... />
    SPMOD LD SP,0 ;restore stack pointer
    dmsmith dmsmith September 2004 Development
  • anyone got a nice clear pic of a Speccy keyboard?Im making a spectrum keyboard keyword reference widget for the OS X dashboard, basicly at the mo it's just gonna be a picture of a spectrum keyboard …

    ... having trouble finding a nice clear, reasonably high res picture to ...
    Sharopolis Sharopolis May 2005 Sinclair Miscellaneous
  • 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…

    ... copy2store


    ; Clear the screen to show we ... br /> copy2store:
    ld (spstore),sp
    c2s_source:

    ... br />
    ld (spstore),sp
    c2sc_source:
    ld ...
    robpearmain robpearmain November 2005 Development
  • CLEAR does not RESTORE the DATA pointer??According to the Spectrum manual, one of the things that a CLEAR command does RESTORE the DATA pointer. Either it doesn't actually do this, or some…

    ... of the things that a CLEAR command does RESTORE the DATA ... program:
    [CODE]
    10 CLEAR 32767
    20 READ a ... first command it sees is CLEAR 32767, which should do a ... isn't restored by the CLEAR command.
    trellis trellis September 2006 Sinclair Basic
  • How do I clear only a specific area of a screen (quickly) in machine code ?I'm looking for a machine code routine which will clear the first 20 rows of the Spectrum's display (or any number of rows or columns) . I have found…

    ... code routine which will
    clear the first 20 rows of ... in memory), which can
    clear the top third, two thirds ... F

    The 'thirds' clear method is as follows :
    This runs extremely quickly, the clear appears to
    happen instantaneoulsy ...
    bobbyjaykid bobbyjaykid July 2007 Development
  • If you've got a real working MF128,IF1, and MDR combo can I ask a favour?So, if you do have a real Multiface 128, Interface 1, Microdrive and, oh yeah, a Spectrum (48k or 128k) that are all working, can I ask a favour...? …

    ...
    ld (err_sp),sp
    ld bc,0 ; clear bc
    ld ...
    jp jp February 2008 Hardware
  • Bizarre stuff in Interface 1's shadow ROMAccording to the Complete Shadow ROM disassembly, the function that exits back to the BASIC interpreter after interpreting IF1 commands is this: [co…

    ... ]
    05C1 END1 LD SP,(ERR-SP) Clear machine stack.
    05C5 LD ... (ERR-NR),+FF Clear error code ...
    Winston Winston March 2008 Development
  • What emulators open/execute .sp files?I've come across ZX Spectrum files with the extension ".sp". It's like Spectrum Profile archive or something. Does it contain the game itself or what…

    I've come across ZX Spectrum files with the extension ".sp". It's like Spectrum Profile archive or something. Does it contain the game itself or what's up?
    finisher finisher April 2008 Sinclair Miscellaneous
  • Timex questionI've been writing a program for CCG2008 and it actually has a use for the 512x192 mode of the Timex computers. I read up about port 255 and how the d…

    ... . Why does the Timex keep SP at around $61F6 regardless of ... value you put after a CLEAR? :???:

    I've never ... program starts with CLEAR 30000, so it expects SP in a similar ... area. When I was trying to clear ...
    Jimmy Jimmy May 2008 Development
  • GBA SP - recommendationsIt seems that over the last year this is the third thread I've started regarding my buying of a new games system. First it was the Game Cube, then an…

    ... an XBox, now a GBA SP which I picked up for ... , I now have my GBA SP and very nice it is ...
    MattLamb MattLamb May 2008 Chit chat
  • Fastest way to clear a screen.We haven't had an optimizing fun for some time, so let's have some: What's the fastest way to clear a screen (i.e., filling the 6912 bytes at 16384 w…

    ... 's the fastest way to clear a screen (i.e., filling ...
    Patrik Rak Patrik Rak February 2009 Development
  • Gameboy Advance SP -> UK PAL TV?Was a Gameboy Advance SP -> UK PAL TV converter ever produced - to put up the console's screen display on a regular TV? The only one I can find info …

    Was a Gameboy Advance SP -> UK PAL TV converter ... won't fit the square SP model. What's the picture ...
    Battle Bunny Battle Bunny August 2009 Chit chat
  • SP and IM2 woesI have a function that writes the backbuffer to the screen using the method by which SP is stored, I "POP" a load of registers and then chnge SP to t…

    ... using the method by which SP is stored, I "POP" a ... of registers and then chnge SP to the screen and "PUSH ... /> If before I do the SP byte swap function I disable ... in the middle of an SP function with interrupts on without ...
    robpearmain robpearmain November 2009 Development
  • SP DOS interfaceLong time lurking so finaly signed up :) Does anyone have a SP DOs interface from Watford Electronics ? I'm trying to find a system disk that came w…

    ... />
    Does anyone have a SP DOs interface from Watford Electronics ... am I missing something ? Its SP Dos Ver 1.2
    Ging Ging May 2010 Hardware
  • A tidy loader for minigamesThe minigame competition doesn't permit the use of separate loaders like [code]10 LOAD "": RAND USR 32768[/code] The loader must be included in the b…

    The minigame competition doesn't permit the use of separate loaders like
    [code]10 LOAD "": RAND USR 32768[/code]
    The loader must be included in the byte count.

    In an attempt to save as many bytes as possible, people have written ...
    ajmoss ajmoss June 2010 Development
  • automatic relocating of non-relocatable codeI was pondering upon the problem of changing absolute addresses used by CALL, JP, etc. when code is moved, without reassembling at the new location; …

    ... CLEAR LOCATE-1
    STACKP: equ 23670 ;=SEED =where SP ... br /> ADJUST: dec sp
    dec sp
    pop hl ... /> PUT_SP: ld (STACKP),sp ;save stack pointer
    ... br /> ld sp,hl ;point SP to list ...
    Battle Bunny Battle Bunny August 2011 Development
  • Kiwi OS for z80 computerHi everyone, Nearly made my z80 computer with 2K ROM 32K RAM. It has an OS im still writing called Kiwi (apple, blackberry, you get the idea ;D) he…

    ... STACK POINT LOCATION
    LD SP, HL ;SET STACK POINTER TO ... COMMAND
    OUT (1), A ;CLEAR SCREEN
    GOTO_START
    LD ...

    LD A, $01 ;CLEAR SCREEN COMMAND
    OUT ($1 ... /> SAVE_MENU
    LD A, $01 ;CLEAR SCREEN COMMAND
    OUT (1 ...
    Robin Robin August 2011 Announcements
  • AND,XOR,OR,BIT,RES,SET,CPL,NEG,RLC,RRC,SLA,SRL,RL, RR,SRA for BASICAs this was drifting away from the original INKEY$ thread I thought that I'd create a new one. So here's a routine to provide all of the above mentio…

    ... . The demo listing makes this clear.

    [code]
    EX1NUM ... ,12
    add hl,sp
    ld sp,hl ;undo USR
    Battle Bunny Battle Bunny October 2011 Sinclair Basic
  • Is it possible to access the +3 disk drive via m/c in USR0 mode?Is it possible to access the disk drive of the +3 via m/c +3DOS calls when running in USR0 mode? I ask because I'm having an awful lot of trouble ge…

    ... /> [CODE] di
    ld ($9000),sp ; 36864
    ld bc,$7ffd ...
    ld sp,$9c40 ; 40000 (we are doing a CLEAR 49050 before ... /> out (c),a
    ld sp,($9000) ; 36864
    ei
    CLEAR 49050 and injecting the code ...
    cmonkey cmonkey October 2011 Development
  • tiny routine to shift RAMTOP & stackCompressing some data areas above RAMTOP and wanting to make the released space available for BASIC arrays, I needed to move RAMTOP without using CLE…

    ... to move RAMTOP without using CLEAR so that existing variables were ... 0
    ADD HL, SP ; 57
    LD SP, HL ; 249
    CLEAR routine to finish off. It ...
    Battle Bunny Battle Bunny November 2011 Sinclair Basic
  • Invalid combination of operands and opcodesIt says the error in the title, why is this?? [CODE] ORG 0000 LD HL, 63000 ;LOAD HL WITH STACK LOCATION LD SP, HL ;SET STACK POINTER TO HL LD A, …

    ... STACK LOCATION
    LD SP, HL ;SET STACK POINTER ...
    CALL CLEAR_LINE ;CLEAR THE LINE
    KEYBOARD_SCAN_MENU ...
    CALL CLEAR_LINE ;CLEAR THE LINE
    LD ... br />

    ;*********************************
    ;(CLEAR LINE)
    ;> A IS ...
    Robin Robin December 2011 Sinclair Miscellaneous
  • Quick question about CLEAR...Hi Folks, I should know the answer to this but I wanted to make sure I understand totally. If I execute a CLEAR then I know it lowers RAMTOP to the…

    ... totally. If I execute a CLEAR then I know it lowers ... +1 e.g.

    CLEAR 60000

    means the ...
    Paddy Coleman Paddy Coleman January 2012 Sinclair Basic
  • .tapein load crashes if no CLEAR performed first(!)Hi Guys, Can anyone explain the following as it has be stumped: I came across an unexpected crash today when loading in a 16K block of code at 8000…

    ... the following:
    [code] 10 CLEAR 32767
    20 LOAD "" CODE ... don't bother performing the CLEAR during development as I keep ... well clear of RAMTOP.

    However ... />
    If I do the CLEAR 32767 before the LOAD "" CODE ...
    BloodBaz BloodBaz August 2012 Hardware
  • Gameboy advance Speccy emulation?I have heard , but can not find clear / understandable info on emulating the spectrum on a Gameboy Advance... but it is apparently possible? Using '…

    ... heard , but can not find clear / understandable info on emulating the ... it... I have a GBA SP.
    Any one know anything ...
    retromad retromad October 2012 Emulators
  • Optimisations in Exomizer Z80 decrunch codeThis is the 163 bytes old code (simple and optimized): [CODE] ld iy, exo_mapbasebits ld a, 128 ld b, 52 push de exo…

    ... add hl, bc ;Always clear C flag
    ld ... br /> [CODE]
    ex (sp), hl
    ld d, h ... ;bc=offset
    ex (sp), hl
    ld d, ... add hl, bc ;Always clear C flag
    ld ...
    antoniovillena antoniovillena November 2012 Development
  • Seikosha SP-1000 VCHello! Is Seikosha SP-1000 VC compatible with ZX Spectrum?

    Hello!
    Is Seikosha SP-1000 VC compatible with ZX Spectrum?
    Saltor Saltor June 2013 Hardware
  • Idk>le me browsing through some game's code >..... [code]61A8 F5 push af 61A9 3EFF ld a,FF 61AB D37F out (7F),a 61AD D33F ou…

    ...
    61C2 ED73FC62 ld (62FC),sp
    61C6 E1 pop hl ... hl
    61CA 31F862 ld sp,62F8
    61CD D5 push ... hl
    62B8 ED7BFC62 ld sp,(62FC)
    62BC 00 nop ... [/img]

    It seems clear it's something else entirely ...
    Hikaru Hikaru June 2013 Development
<1234567…34>

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