| Home |
| 3DCK.TXT ** Transferring a 3DCK C64 .d64 file to a Spectrum .dsk file |
| Arrays.TXT ** Sorting an array ** Rotate a 3x3 array through 90 degrees ** Saving time populating large arrays ** Compact a string array ** What's the deal with hash tables, anyway? |
| Bitwise.TXT ** AND,XOR,OR,BIT,RES,SET,CPL,NEG,RLC,RRC,SLA,SRL,RL,RR,SRA for BASIC ** Bit operations in BASIC: AND,XOR,OR,BIT,RES,SET,CPL ** Simple BIT,RES,SET in BASIC |
| Compression.TXT ** Lempel-Ziv compression routine (draft) ** Lempel-Ziv compression routine (final) ** Lempel-Ziv compression concepts |
| DB1.TXT ** Kobrahsoft DB1 - getting it to work |
| Display.TXT ** Display file addressing; Screen slicing ** Addressing bottom 4 lines of display |
| Editing.TXT ** Joining & splitting BASIC lines ** Editing strings with INPUT LINE ** INKEY$: No Key / Any Key ** INKEY$: use with caution ** Changing the colour of the INPUT line ** INKEY$ timings ** Keyboard scanning routine |
| Errors.TXT ** ON ERROR ... REPEAT ** ON ERROR ... GO TO ** ON ERROR ... REPEAT ... all models |
| GOSUB+GOTO.TXT ** Locating the GO SUB stack ** Break from GO SUB (assembler version) ** Break from GO SUB (BASIC version) ** Enhanced RETURN (in BASIC) ** Passing parameters to subroutines ** CLEAR does not RESTORE the DATA pointer ** PUTRAM - Move RAMTOP without side effects |
| HowTo.TXT ** How To Write A Program ** A Miscellany of Dangerous Tips ** UNTIL ... DO and WHILE ... DO loops ** Pathfinding in Networks/Mazes ** Learning Z80 assembler - useful links ** Adding extra commands to BASIC ** Renumbering routines ** Detecting the ZX Interface 1 ROM version ** Paging memory on the 48k Spectrum ** Converting .Z80 to .TAP ** Countdown Timer ** Calculate the BEEP pitch ** Get the starting address of a game ** A painter (enclose & fill) routine ** Check if two rectangles intersect |
| Jelly-Vision.TXT ** Jelly-Vision! |
| Mcode_Parameters.TXT ** Passing parameters to machine code ** Assembler listings with OpCodes in a distinct column ** Timing calculator extension to Z80 OpCodes spreadsheet ** BASIC commands which can include a USR call ** Machine code optimisation |
| Numbers.TXT ** Testing recursive functions ** Number base 2 through 10 conversion ** Number base 10 to 2 conversion ** Number base 2 through 36 conversion ** Calculating percentages ** Updating BASIC variables from assembler ** Unravelling the Spectrum's floating point number format ** Exponentiation of negative numbers ** Using the ROM's FP calculator's memory area ** Calculating an expression to give a target number ** Z80 math routines ** Full 16*16-digit BASIC multiplication ** Print a large binary integer as a decimal |
| Plus128.TXT ** Switching 48k/128k modes within a BASIC program ** A 128k routine to put tokens in strings ** Which 128k Spectrum is this? ** How to check the whole memory on a +2 grey ** Problem with PRINT #stream on +128k ** BEEP durations and PLAY equivalents ** Spectrum 128k programming tutorials ** Editing shortcut keys for the Spectrum 128k |
| Plus3.TXT ** +3 CAT to string ** +3 BASIC DOS_Demo ** File comparator ** 128k+3 RAM paging from BASIC ** +3e Streams & Channels ** RAM used by +3DOS ** Running the +3 self-test program without the magic word ** +3e Load & Run from assembler ** Converting commercial disk games to use standard BASIC loaders |
| Printing_Graphics.TXT ** Drawing perspective grids in BASIC ** More on storing mazes (Genesis of BOB) ** BOB the Screen Builder ** Overlaid square grid ** Increasing the number of UDGs ** Extracting pictures from GAC & PAWS ** Make 8x UDGs from attribute blocks ** Drawing UDGs at different scales ** Scrolling a map ** Scroll one column ** Plot coordinates for Spectrum character set ** Graphics Extractor ** Simple horizontal scroll ** Drawing ellipses ** Vertical downward character WrapScroll ** UDG collision detection ** Sprites in +3 BASIC ** GUI in Sinclair BASIC ** 3D line drawing ** Large sprites ** Machine code sprites and graphics for the ZX Spectrum ** Plotting and rotating wireframe graphics ** Revealing a hidden picture ** Fractal graphics ** Plotting in the lower screen ** Colour clash comments ** Erasing the screen ** Next pixel down ** Mini scroll routine ** Using SCREEN$ from assembler ** Colour considerations when plotting from assembler ** Plotting an energy bar ** Scrolling by 2 pixels |
| Printing_Text.TXT ** Number Padding Function ** Procrustean Printing ** Printing text with condensed print controls ** Printing 64 column text from BASIC ** A neat little BASIC trick for TALL letters ** Proportional Print Routine ** Printing a listing ** Printing text at any position/size |
| QuickCopy.TXT ** Quick BASIC RAM copy ** Writing Faster BASIC |
| RAMdisk.TXT ** RAMdisk functions |
| Random.TXT ** Constraining a list of RND numbers ** RND commands ** Using RND in machine code ** Some alternatives to RND ** Random point screen fill |
| Relocating_Mcode.TXT ** Relocating machine code ** Getting PC into HL |
| ROM.TXT ** Which BASIC commands/functions affect FRAMES? ** System Flag Variables ** The $028e KEY_SCAN routine ** Spectrum 48k ROM routines |
| SaveLoad.TXT ** SAVE-ing SCREEN$ & BASIC as one file ** SAVE-ing without waiting for a keypress ** LOAD-ing without displaying the filename ** Saving BASIC programs in a stack ** Using the ROM's tape routines from assembler ** Force Auto-RUN after LOAD ** Using MERGE in a BASIC program ** Recovering BASIC from a faulty tape ** Why no 'Avalon' loading screen? |
| Space.TXT ** Calculating free memory ** How much space does a number take? ** Making Room ** Unused RAM check ** Calculating FN memory usage |
| Storing_Mcode.TXT ** Storing machine code in a BASIC program ** Inserting binary code into ZX Spin assembler ** Embedding/Concealing static data in BASIC ** Insert a REM of a given length into a BASIC program |
| Strings.TXT ** String DEF FNs ** Find-Fill-Copy functions for BASIC ** Bytes to String ** Screen2String ** STR$ bug fix ** SCREEN$ bug fix |
| TAP2DSK.TXT ** Converting programs from TAP to DSK ** Converting bootstrap loaders to standard loaders |
| TXT2EMU.TXT ** TXT2EMU (load BASIC text into an emulator) ** TXT2EMU truncate REM enhancement |
| Validation.TXT ** Input Validation |
| Variables.TXT ** Finding a variable in VARS ** Indirect Variable Assignment ** Undefine function ** Using the DEFADD area for extra variables ** DumpVARS (listing variables during runtime) |