-
The I register pointing to $40–$7f causes ULA snow and a crash. Or does it?I have heard it from numerous sources, including a few members of this forum, that 128K/+2 machines crash if the I register points to a range of $40–…
... />
[code]
ld a,($5b5c)
and $f8
ld ($5b5c),a
out (c),a
ei
ld (hl),d
ld a,$f7
ld i,a
... push af
ld a,%01001000
ld ($5800),a
pop af ... -
Spanish M.I.A. List Hi all, I have a page which URL is: <a href="http://www.espectrum.org devoted" target="_blank">[url]http://www.espectrum.org[/url] de…
... all,
I have a page which URL is:
... the spectrum. And I've got a M.I.A list of some ... of them. I would ... Team]
Shooting Range -Mix I- (GunStick) [New Frontier]
... published but taht is a thing I don't know. [ ... -
The I register and IM 1Hi al! I've been doing some coding, replacing the BASIC ROM with my own code and upon examination of a few 16Kb cartridges, all the ones I've look…
Hi al!
I've been doing some coding, ... examination of a few 16Kb cartridges, all the ones I've looked ... />
[code]ld a,63
ld i,a
im 1
I register, apart from its use ... -
IM 2 interrupts and smooth scrolling - easy peasy!Okay, been fiddling around with IM 2 and have actually mastered (I think) how to use IM 2! Now I run my game Ragnar Revival in IM2 and use HALT to sy…
... , i.e at 65278. ALSO, I guess I made the table a couple ... prepint
mainloop
ld a,07Fh ;Trap Space key
ld hl,58880 ;Building up a table with
ld de, ... br />
di
ld a,230
ld i,a
im 2
IM2 Machine Code Sprites Example Code Using Char Based SystemFurther to my earlier post, here are sprites running using char method with IM2 driving it Note, for 48k spectrum using TASM [code] ; ***********…
...
LD A,RECTLEFT
ps3: LD C,A
INC C
LD A,C ... up a table with
ld bc,0FDh ;253*256+253, i.e ...
di
ld a,0FEh
LD I,A ; I=FE
IM 2 ...Smooth Color Masked Sprites using fast page flip on 48kHere is a quick demo of using char based sprites using the Page flip method: a) Background is copied to buffer b) Sprites drawn on buffer c) Buffer …
... UP A TABLE WITH
LD BC,0FDH ;253*256+253, I.E ...
DI
LD A,0FEH
LD I,A ; I=FE
IM 2 ...Smooth Masked Sprites using fast page flip on 48k Part 2Ok, After all the suggestions in Part 1, which were all excellent (Thankyou), I opted on the following: I have 2 x 6k Offscreen areas (Yes, that's …
... A TABLE WITH
LD BC,0FDH ;253*256+253, I ...
DI
LD A,0FEH
LD I,A ; I=FE
IM 2 ... INC B
LD A,(BC)
LD (HL),A
LD A,(DE) ; Get ...Urgent Help needed to fix this: calling all machine code gurusI am currently trying to write tutorials on the amazing Orfeus music composer by Proxima which allows you to do multi channel music through the beepe…
... /> ret
l8900: ld a,#3b
ld i,a
im 2
call l8c5c
ei
ld hl ... /> ld a,#00
ld (l8994+1),a
ld (l899d+1),a
ld (l89e3+1),a ...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 …
... ;Disable interrupts
ld a,c ;On entering from BASIC ... main interrupt routine:
ld hl,sample_jump ;Sample instruction ... of address table...
ld I,A ; ...goes into the interrupt ... 06t => 014t
ld a,b ;04t => 018t
Need help with interrupts againI'm fighting to understand how interrupts code handling works I'm trying to set my simple own interrupt routine, as I don't want to be dependent on …
... /> LD A,24
LD (65535),A
LD A,251
LD (65524),A
LD ... />
LD (65525),HL
LD A,91
LD I,A ;the adress ... of interrupt code is stored at (I ...joining lines of BASICDue to overwhelming demand - well, one demand - well, more of a suggestion, really - here's a routine to join together lines of BASIC. The vertical c…
... ) ;65136
SUB 1
LD I,A
IM 2
RET ...
DISABLE:LD A,$3F ;65146
LD I,A
IM 1
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…
...
IM 1
LD A,3FH
LD I,A
RET
HIRON LD A,0FEH
LD I,A
LD BC,0100H
LD H,A
LD L ... ,C
LD D,A ...Byte-order backbufferThis is a tool for Z80 coders who wish the Spectrum screen had a serial layout. It runs as an interrupt mode 2 service routine and uses POP and PUSH …
... byte of vector table
ld i, a
pop af
... attr ; write the attributes
ld ix, attributes + 768 - 16 - ... (chunk * 2048)
ld hl, $ + 9
ld (endcall), hl
... Martijn and I had a discussion about hosting this but a) it ...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…
... $80E2 ;32994
DEACTIVATE: LD A,$3F
LD I,A
IM 1
;33001
ACTIVATE: LD A,$80
LD I,A
IM 2
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…
... ED57 ld a,i
61DA 67 ld h,a
61DB ED5F ld a,r
ld a,h
62A7 ED47 ld i,a
62A9 7D ld a,l
62AA ED4F ld r,a
z88dk and im2I set up a minimal IM2 mode so I can draw sprites for a laff [code] #include <string.h> #include <stdio.h> #include <im2.h> #include <stdlib.h> #in…
...
writeagain:
LD (BC),A
INC BC
INC ...
writeagain:
LD (BC),A
INC BC
INC ... a precaution.
ld a,200 ; high byte of pointer table location.
ld i,a ...Scrolling Bi-Colour Engine for 4-Player GamesJust putting this code up for people to have a look at. Far from finished. Should simply compile and run a bit of a demo. Only good for 128K and +…
... to the table:
ld a,190
ld i,a
im 2
;------------------
never_end
ld a,0
ld a,I
ld a,(IX+0) ;odd time ... /> ld a,c
add a,a
add a,a
add a,a
add a,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…
... br /> 0x0001 XOR A ; A=0
0x0002 LD DE,#0xFFFF ; DE ... ...
0x11CB LD B,A ; B=0
0x11CC LD A,#0x07 ; A=0b00000111
0x11CE OUT (FE),A ... 0x3f (ff)
0x11D2 LD I,A ; QUESTION: what does this ...Interupt service routinehas anyone set up a interupt service routing with pasmo? this one I tried resets the speccy EDIt- I placed the code after the END directive, I fi…
... a precaution.
ld a,254 ; high byte of pointer table location.
ld i,a ...
ld a,#255
ld hl,$4000
ld (hl),a
ld a,#255
ld a,1
ld hl,$4000
ld (hl),a
Labelif2 ...Help With infinite music on 128KHi :) I'm trying to play infinite simple music on 128K , but i don't know what is wrong with the loop I tried this routine but doesn't work I…
...
ld (hl), hiRSI
ld a,$FE
ld i,a
... /> bucle
ld a,(hl)
or a
jr nz, ... (c),a
inc hl
ld a,(hl)
ld b,$ ...
ld (pos),hl
dec a
ld (hl),a
...type in to learn about IM2I'm trying to mess around with learning about IM2 and I found a nice little article in Sinclair User September 1988, issue 78, Page 70-71 [url="https…
... ;disable maskable interupts
ld A, $3f
ld I, A
im 1
INT_ON:
di
ld A, $fe
ld I, A
im 2
;
ld HL, $fe00
line routineWondered if anyone can help me out. I have been programming a 3d graphics library for the spectrum, in Machine code. The line routine that I have i…
... ld hl,0
ld (counter),a
ld a,&xx
ld i,a
ld ... hl,&xx00
ld ... de,&xx01
ld ... this as a gaming engine then I would try ...Best way to codeHi, I've been using Zeus Assembler to code MC programs so far. Nothing fancy just the odd scroll left or animation stuff. Wot I'd like to know is, …
... is how to make a table:
. LD HL,#F000 ; START ... ),#F1 ; 257 value !!
. LD A,#F0
. LD I,A ; point to high byte ...what are the advantages and disadvantages of using.........what are the advantages and disadvantages of using an emulator rather then using a zx spectrum? octave
... , gave me some trouble with a snowwy interrupt routine. In the ... runned fine, but in real I had not thought about the ... snow-intrupt.
i.e.
LD A,100
LD I,A
RETSpectrum edge connectors and 'Dataman Softy S4'Hi, I moved this from the sales thread because it seems more appropriate...anyway... I was twerping around the idea of turning a Spectrum into a we…
... br />
LD A,#FD
LD I,A
LD HL,#FD00 ; TABLE
LD B,0
FILL LD ... /> MY_PROG PUSH HL
LD HL,#4000
INC (HL ...Basic and AY musicis it possible to play an ay-music in background while a basic program is running?
... />
DI
LD HL,HIGHBYTE ; table
LD DE,HIGHBYTE + 1 ... /> LD BC,257
LD A,VECTOR ; IM2 vector
LDIR
LD I,HIGHBYTE ... that you would make a Z80-error.
I-reg can not ... /> it must be
LD I,A
;)
