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Screen2StringFurther to writing that BASIC one-liner to redirect CAT to a string I thought that I'd do a general redirection routine for anything which normally p…
... FN p(a)=PEEK a+256*PEEK (a+1): DEF FN ... (v)=v-FN h(v)*256: DEF FN h(v)=INT ... (v/256)
3 CLEAR appropriately
Store and restore attribute valuesI am needing ideas on how to write a machine code routine that will store/restore (more important to restore) attribute values to the 22528 area. I …
enhanced GOSUB/GOTO (in BASIC)Further to my previous post under "BREAK from GOSUB" here's the two ideas mentioned there put together. Note that to keep it quick it expects the DEF…
... FN p(a)=PEEK a+256*PEEK (a+1):
DEF ... (v)=v-FN h(v)*256: DEF FN h(v)=INT ... (v/256)
2 LET prog=FN ...What's wrong with this code ?OK, working my way through Jonathan Cauldwells 'How To' tome and I can't get the following to run in either spin or basin. ( iused the assembler in b…
... with 'ld hl,21+15*256'
Anybody help ?
ld hl,21+15*256 ; load hl pair with starting ...Spectrum 48K - upper memory problemsHi I have a ZX Spectrum 48K issue 3B which does not see upper memory. On PRINT PEEK 23732+256*PEEK 23733 i got result 32767. POKE 32768,85 and PRINT …
... .
On PRINT PEEK 23732+256*PEEK 23733 i got result ...Moving a line down the display in assembler?...It's not a "[I]how can I do it[/I]" question, it's more a "am I missing something in trying to do it a new way" kinda question. What I've been doing…
... - ie. two tables of 256 bytes each placed on the ... start of a 256 byte page.
ld h,SCRTABLE/256
add a,(hl)
ld h,SCRTABLE/256
add a,(hl)
CMWC random number generator for Z80Seeing the interest regarding the [URL="http://www.worldofspectrum.org/forums/showthread.php?t=23070"]Xor-Shift random number generator for Z80[/URL]…
... />
ld h,c ; t = 256 * y
ld l,b ... /> ld d,h ; c = t / 256
ld (rnd+1 ... /> ld a,l ; x = t % 256
cpl ; x = (b-1 ... . Having the table aligned to 256 byte boundary could be used ...AY-3-8912 emulationI am trying to improve the emulation of the AY-3-8912 in FBZX wii. I studied the code of some emulators and read some documents. I would like to be…
... /> 2) Envelope frequency is 1/(256*envelop_period) of AY-3-8912 ...A "bit" of a curiosityHaving to use a bit of m/code to do the AND in that key check function, I was prompted to revisit the "AND,XOR,OR,...for BASIC" topic and came up wit…
... llll: LET da=PEEK 23639+256*PEEK 23640+8:
POKE ... ,da-INT (da/256)*256: POKE 23564,INT (da/256)
....
GO ...Jelly-Vision!As threatened in the "'Spectrum Play' Error" thread, here's a ruff'n'reddy interrupt driven full screen wobbling routine which has no practical use w…
... 1
ld bc,6144-256
jr nz,MOVEUP
MOVEDOWN: ld hl,16384+256
ld de,16384
ld hl,16384+6143-256
lddr[color=green]
Spectrum Emulator that supports low resolutions and runs smoothlyHello to All, I have been trying to find a spectrum emulator that will work well through my CRT TV (using RGB to Scart) Most emulators seem to supp…
Developing apps for ZX Spectrum with SDCCDue to troubles with makebin utility which always starts coversion at memory address 0x0000 and can only produce binaries < 32KB, it can't be used to…
Due to troubles with makebin utility which always starts coversion at memory address 0x0000 and can only produce binaries < 32KB, it can't be used to create ZX Spectrum programs with SDCC. I present [B]makezxbin[/B] utility (see chapter 4. bellow) and ...Issue 2 headache!Ive got an issue 2 here that firstly had a blown regulator (fixed), now its reading as a 16k machine (its fully populated), ive replaced and socketed…
... PRINT PEEK 23732 + PEEK 23733 * 256 I get 44053;
Then ...saving time populating large arraysI use a variation on this idea for storing machine code at the end of programs without interfering with LIST, then it occurred to me that it would al…
... FN p(a)=PEEK a+256*PEEK (a+1):
DEF ... (v)=v-FN h(v)*256: DEF FN h(v)=INT ... (v/256)
11 LET offset=24 ...Graph Plothi! please, help with code: [PHP]For x=-100 To 100 For y=-100 To 100 If (x/2-25)*(x/2-25)+(y-50)*(y-50)<200 Or (x/2+25)*(x/2+25)+(y-50)*(y-50)<200 th…
hi! please, help with code:
[PHP]For x=-100 To 100
For y=-100 To 100
If (x/2-25)*(x/2-25)+(y-50)*(y-50)A 128 Routine to Put Tokens in StringsI was writing a DEF FN on the +128k and decided that I'd had enough of not being able to put function tokens in strings without a great palaver and s…
... p(23639):
LET la=256*PEEK (a+1)+PEEK (a ... FN p(a)=PEEK a+256*PEEK (a+1)
[/code ...RCS (Reverse Computer Screen)[B]RCS[/B] ("Reverse Computer Screen", or simply SCR written backwards) is a small utility I'm about to release, that reorders bytes from the ZX-Spec…
Fastest Z80?Hi , Could somebody explain more about the Kawasaki Z80 33 MHz to me? Is it fully backwards binary compatible with older Z80s and could it be used a…
... RAM
? Single voltage
? 256 I/O ports
? 8080 ...TRDCUT for WindowsI see only old DOS version of TRDCUT utility on WOS: [url]ftp://ftp.worldofspectrum.org/pub/sinclair/tools/pc/trdos/TRDCUT11.zip[/url] Exist any new…
... filesize will always multiple of 256 bytes (TRD image with all ...Keyboard TrickI know how to use the multi key in BASIC with IN you can get the keys [QUOTE]IN 254+256*(255-2^K)[/QUOTE] K is the keyboard's half row, comes from …
...
[QUOTE]IN 254+256*(255-2^K)[/QUOTE]
let a = 254+256*(255-2^c)
let ...Fastest redraw of screen from UDGsHere's a question for everyone, to generate a bit of code to be used in games: On a standard 48K Spectrum, what's the fastest way to redraw the scre…
... block of data that defines 256 8x8 UDGs. We then have ... the first byte of all 256 chars, then the second byte ...Z80 internal compressionThis isn't exactly a ZX Spectrum problem, but since WOS probably has some of the best Z80 coders in the world, I thought I might ask anyway. For my …
... />
4) in range of 256 rows, check for row duplicates ...Homebrew Microcomputer design...getting ICs and stuffFor anyone interest in homebrew microcomputer design or just making add-ons and electronics gizmo's..this might be of interest. Sourcing affordable …
... , Hardware accelerator functions too ! 256x192 (256 Colors), 512 x 192 (16 ...What is the ULAplus 64 colour palette that is closest to the Spectrums own?I think the title says it all. :) I'm finding it hard to find the colours from the 256 colours that match the original 16(15) colours the most. Can …
I think the title says it all. :)
I'm finding it hard to find the colours from the 256 colours that match the original 16(15) colours the most. Can anyone help?quick RAM copy using LET in BASICI'm in the process of reviewing, revising and refining all the programming tips & utility routines which I've posted on this forum over the last eigh…
... FN p(a)=PEEK a+256*PEEK (a+1):
DEF ... FN l(v)=v-256*FN h(v): DEF FN ... h(v)=INT (v/256)
20 DEF FN q ...How slow can a CF-card goSurprising. My 48k Spectrum did not allow me to CAT all the 254 files that my private DOS (for CF-card) can store in each sub directory. Spectrum get…
... when all requested 8 sectors (256* 16 bytes) are not yet ...
