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Rainbow Generator for 48K Spectrum using PUSHThis is what I came up with from [B]gasman[/B]'s suggestions. It's stable in ZXSpin and ZX32 simulating a 48K Speccy. Anyone like to try it on the …
... address that was called.
JR NZ,interrupts_off
;Switch ... => 022t
jp nz,interrupt_delay_loop ;10t => 032t ...
nop ;Timing adjustment tweaks
nop
nop ;Timing adjustment tweaks
nop
Hooky - hook ZX ROM and rewire RST and NMI to RAM - rantThis is a rather long rant. Not for short tempered. :) The objective is to hook into RST "vectors" and NMI on a Spectrum without affecting the normal…
... part of a grand cycle timing scheme (and it is ... (ROM TOP)?
0x11E0 JR NZ,downloop ; if not repeat
0x11E7 JR NC,test_2 ; if HL& ... ; 2-1=1
0x11EA JR Z,test)_2 ; bad value ... ; 1-1=0
0x11ED JR Z,uploop ; correct value!
Scrolling loader counter in 85 T-States?Would it be possible to write a scrolling loader counter in 85 T-States? I have a custom screen load routine that loads attribute first, then the …
... and 7
jr nz,loop1 ; jr if not 8 pixels
xor a ; 04ts ; (timing)
xor a ; 04ts ; ... ld a, ixh ; 08ts ; (timing)
ld a, $00 ; 07ts ... dlyloop: dec a ; 04ts
jr nz, dlyloop ; 07/12ts
; ...ZX81 and ZX80 emulator on Spectrum 128KA couple of weeks ago we were talking about a new ZX81 emulator for the 128K. Someone beat me. More details at [url="http://www.fruitcake.plus.com/S…
...
LD E,$94 ; timing value.
;; ... LD A,E ;
JR C,L0388 ; loop back with ...
POP DE ;
JR NZ,L039C ; to BIT-DONE
How can I tell if 128k in codeIs there an easy way in code to check if the Spectrum has 128k, rather than 48k so I can display a message "Must have 128k" etc
... 's an issue with timing, use a timing test. For this, set ... bc
cp 0
jr nz, lp[/code]
Then test ...problem using FRAMES to generate 'random' numbersI realise the pros use bytes from ROM to get their random numbers, presumably because they want to use FRAMES to synchronise the printing and avoid s…
...
JR NZ,MOVERIGHT
JP MOVELEFT
In timing it would ... MOVELEFT-routine directly under the JR-condition, then the reach-routine ...'orange' on a spectrumalways wondered why spectrums could never seem to achieve the colour orange? wasn't one of the default colours, and don't remember seeing anything th…
... quick go.
My timing is out quite out of ... ,(23560)
cp 113
jr nz,flicker
; restore paging ...ZX Spectrum (16K) sound/beepHi all, I think I'm in right place now, I've tried to find an answer how to generate two channel sound using ZX Spectrum 16K. Only think I've found …
... speaker, combined with a timing loop of sufficient accuracy to ... for first channel.
JR NZ,labl1 ; Do we play ... /> labl1: DEC L
JR NZ,labl2 ; Do we play the ... /> labl2: DEC D
JR NZ,labl3 ; Do we play the ...Rainbow Generator for 48K Spectrum using PUSHThis is what I came up with from [B]gasman[/B]'s suggestions. It's stable in ZXSpin and ZX32 simulating a 48K Speccy. Anyone like to try it on the …
... dec c ; next counter
jr nz, loop ; finished?
ret ; ... => 022t
jp nz,interrupt_delay_loop ; 10t => 032t ...
nop ; timing adjustment tweaks
nop
nop ; timing adjustment tweaks
nop
Creating a Spectrum game that won't load...Dear All, I have recently been using my ZX Spectrum as a reference for the production of a new body of art work and something I keep coming back to …
... />
LD HL,$0C98 ;timing
EX AF,AF'
DEC L
JR NZ,SALEAD
DEC B
LD BC,$3B0E ;timing
EX AF,AF'
SABI1 DJNZ SABI1
JR NC,SAOUT
... /> LD B,$3E
JR NZ,SABI2
DEC B
Please test my Manic Miner remake!Thanks to everyone who downloaded my sneak preview of Manic Miner Turbo. Thanks especially to na_th_an who is the only person so far to give feedback…
... save registers
IFDEF TIMING
ld a, 0
.finished
IFDEF TIMING
ld a, 7
ld (tune_tick), a
jr nz, .skipnote
ld a, ( ... attribptr), a
IFDEF TIMING
ld a, (bdr_colour)
Sorting an array...Hi Folks, Over the weekend I had a play with sorting algorithms - takes me back to my student days! :-o My first try was with the good old Bubble S…
... was correct. It runs the timing loop twice, once with the ... time. Unfortunately using FRAMES for timing isn't precise enough, as ... go about getting an accurate timing for this, or for the ...
NEXTS2: dec b
jr nz,FORS
ld a,1 ...Optimization for this codeHello, I have done and submitted a small program for the CSS Crap Game Compo which involves a machine code routine. The z80 with BASIC and MC is av…
...
ld (hl),a
jr nz, kontroll1[/CODE]
could ... />
[CODE]inc (hl)
jr nz, kontroll1[/CODE]
That ... perhaps want to maintain some timing so people can actually see ...Spectrum 128K RS232 to PC serial cableIf you have read some of my recent posts then you will know that I am eager to link my Spectrum +3 to a PC. This will be done by wiring a standard PC…
... to replace the x86 software timing loops with hardware timers. I ... /> dec e ; 4
jp nz,txd ; 10
ld ... /> and a,a ; 4
jr nz,write ; 12
ret
Ocean's Cobra - +3 incompatability. Is their a fix?Hello all, Anyone know of a fix for Ocean software 'Cobra' (the one with stallone in it) ? This was the first game I bought for my 128k toastrack, a…
... area (bright) for flicker free timing crap. And won't work ... b ; 9604 b8 $04ts
; jr nc, l_9601 ; 9605 30 fa ... /> ; nop ; 9604 00 $04ts
; jr nz, l_9601 ; 9605 20 fa $07 ...LCD interfacingHas anybody interfaced [url=http://mdfs.net/Info/Comp/LCD]an LCD[/url] to a Spectrum? I'm toying with putting together an interface, a small 32x8 dis…
... without complex ports
; or timing problems.
; Interface equates ... ,A ; check status bit
JR NZ,BUSY1 ; loop if still busy ... HL,DE ; decrement HL
JR C,LOOP2 ; loop if not ...Oscilloscope Speccy ProgramHi all, I remember very well in the old days when my Speccy was my single computer (around 1992) that I have had an oscilloscope software. This uses…
... 6, A ; CB 77
JR NZ, L_7F67 ; 20 01
INC ... , disabling IRQs while in a timing loop is essential in order ...Serial protocol, help!Hi, simply trying to find best way to transfer programs from PC to real ZX Spectrum for testing purposes. Under Windows I tried using Spxfr and it w…
... ,b
or c
jr nz,populate
ld hl ... ,b
or c
jr nz,send
ret
di ; no interrupts for precise timing
;; raise CTS
BackgroundDoes anyone know how i would create a background similar to [URL=http://imageshack.us/photo/my-images/42/backgroundmockup.png/][IMG]http://img42.ima…
... row
dec a
jr nz,loop2 ;repeat 'a' times
halt ;intricate beam tracking & timing
xor a ;zeroise accumulator ... ;black border
halt
jr loop3[/CODE]
(Despite ...Another custom loaderI got into my hands a cassette with compilation of Polish programs. most of them MIA. Unfortunately some of them are saved with a kind of custom loa…
... /> And I get these timing values for the "special" ... 0xF88D cp a
0xF88E jr nz,f870
0xF890 call ... 0xF89C or l
0xF89D jr nz,f898
0xF89F call ... inc h
0xF8B1 jr nz,f8a4
0xF8B3 ld ... cp e
0xF8D8 jr nz,f870
0xF8DA ld ...28-character wide multicolour(ish) on 48k SpectrumLong-time lurker here... I've always been interested in rainbow effects on the 48k Spectrum, mainly from a perspective of "Just what [I]would [/I]ha…
... that I've lost the timing in the second row down ... ,b
or c
jr nz,waitlp
ld hl,18247 ...
