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RCS HelpThis plea for HELP is related to the RCS screen handling routines thread. To further save space in the current crop of routines its looking like the …
... /> Current routine:
[CODE]78 ld a,b
A9 lp1 xor ... xor c
57 ld d,a
A8 xor b
07 rlca
5F ld e,a[/CODE] -
SpecBAS 0.789 releasedHi all! Back with another SpecBAS release - this one's mostly just about sprites and bug fixes. One new addition I do quite like is the expression c…
... a=MENUBOX("Title",a$())
Fixed:
Strange bug ... index
An obscure bug that caused some commands ... command, ironically enough
A bug in the sprite frame address ... array hashing function
A bug in BIN followed by ... -
LZ4 decoderI encountered the [URL="http://code.google.com/p/lz4/"]LZ4 compressor[/URL] a few weeks ago. Reading the [URL="http://fastcompression.blogspot.co.uk…
... =0
.mainloop:
ld a,(hl) ; place token into accumulator ... already
;; been decompressed
ld a,4 ; always at least four ... (4T)
.getlength_nocarry:
ld a,(hl) ; re-read the byte ... -
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
... ; interrupts off as a precaution.
ld a,200 ; high byte ... of pointer table location.
ld i,a ... -
Troublesome routine, help needed!Having problems with this routine, it basically fires a rocket up the screen, but refuses to detect collisions. I'm using attribute blocks for detect…
... LD A, (rx1) ;calculate ATTR
LD (av1), A
LD A, (15)
LD (bv1), A
LD A ... , (av1)
LD H ... -
Simple memory transfer routineI'm looking for a simple memory transfer routine that shifts 32 bytes of data from the address HL is set to 55143, I have tried using LDIR, but cant …
I'm looking for a simple memory transfer routine ...
ld a,(51990) ;level number
ld b,a
ld hl,udg ... /> loop push bc
ld b,32 ;8 x 4 ...
djnz loop
ld b,32 ;hl should now ... level x 32
ld de,55143 ;de pointing to ... -
Z80: ABS(HL) functionI must be very tired but I cannot get my head around whether this function provides a correct implementation of a ABS function for a signed 16-bit va…
... provides a correct implementation of a ABS function for a signed ... ]
; Input: HL contains a signed 16-bit value
LD A, H
CPL
LD H, A
LD A, L< ... br /> NEG
LD L, A
About how z88dk generates code and makes room for variables.When you attempt to code games for the 128K models using z88dk in C you need to somewhat control where variables are stored in memory. I thought tha…
... /> [code]ld A, $06
ld ($5EF1), A
ld A, $07
ld ($5EF2), A
ld HL ... , $0008
ld ($C729 ... ), HL
ld ...Calculating screen address to alternative ATTR area?I'm using this small snippet of code to convert a screen address to an attribute cell address... [CODE]AttrDE: ld a, d ; get the hig…
... br />
[CODE]AttrDE: ld a, d ; get the high byte ... ?
[CODE]DFtoATTR LD A,H
RRCA
RRCA ... /> OR 58H
LD D,A
LD E,L
RET ...Convert AT co-ordinates to PLOT co-ordinatesHow do you convert the 2 from MC? I don't know how to convert the vertical value as they're differently ordered... Heres what I have so far: [CODE]…
... ;calculated plot points
ld a,(50000-3) ;vertical AT co ... /> ld b,22
sub b
add a,a
ADD A,A ...
add a,a ;times by 8
ld (x),a ...Math Quiz - MultiplicationThe topic is fast multiplication routines, from 8x8 to 32x32 and all points in between. These functions sit underneath floating point libraries, gen…
... /> ; sort the multiplicands
ld a,l
cp e
ld a,e
ld e,l
ld a,e
ex de,hl ...
ld a,h
ld h,l
ld l,d
Colission detection problems.G'ah...it's always the same (I've asked before too) - I'm always struggling when it comes to doing box colission checks, so I'm basically hoping you …
... /> ld a,h ; player's y coordinate.
inc a
ld b,a
ld a ...Ghosts n' Goblins loaderI'm trying to put Ghosts n' Goblins onto a +3 disk but struggling to understand the mc loader. Basic loader [code] ink 7 : clear 25000 : load "" cod…
... : LD A, D
65276: LD (65378), A
65279: LD A, E
65280: LD (65375), A ... : LD A, (DE)
65506: LD (HL), A
65507: LD (HL), A
65508: LD A, B ...
65509: LD (DE), A ...Venturespeak Helplooking at the code from ZX Computing, October, November & December 1986. How do I make the code do more then 3 letters say 5. and could it be made …
... 3E01 LD A,001
60175 32DFEB LD (TIME),A
60178 3A9BEB LD A,(COUNT ... )
60181 329CEB LD (CT2),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 +…
... /> ;------------------
never_end
ld a,0
ld a,I
ld a,(IX+0) ;odd ... /> ld b,0
ld a,c
add a,a
add a,a
add a,a ...
add a,a ;a = y ...Questions about Vortex Tracker II exported songsHi, I have been experimenting with Vortex Tracker II lately and have a couple of questions. By exporting the song to TAP format, a file is generated…
... Tracker II lately and have a couple of questions.
... =1]
[*]There is a noticeable gap in the TAP ... org 27789
LD A,1
LD (27810+10),A
CALL ... CALL 27810+5
LD A,(27810+10)
RLA
4294967296 pseudo output portsIn an effort to avoid any hardware conflicts with the clashbasher interface I've been looking for an alternative to using the spectrum's ports for ou…
... has. Unfortunatley the prime candidates LD a,a LD b,b etc seem to ... Woody View Post
Ld a,a; ld b,b; ld c,c...
These ... quite straightforward to detect when a LD (HL),n is being executed ... open a set of 65536 ports for writing I use LD (IY ...dumping protected BASIC loadersI wrote this a few weeks ago but forgot to post it. It will load & list from tape/TAP/TZX any BASIC program which has been saved with SAVE, including…
... a+PEEK (a+1);":";FN p(a+2); PAPER 7;" ";:
LET a=a ... PRINT INK 2;"]";: LET a=a+6: GO TO 21 ... /> [code]
LD A,$FF ;$FF for a data block
SCF ... ;Carry set for LOAD
LD ...JP (HL) confusionokay.... JP nn will jump to memory address nn. JP (HL) ,I assumed would read the contents of memory address HL and jump to the location and be a gre…
... the location
and be a great and cheap goto command ... instead of using a list of CP...JP nn ... /> LD A,bytetocheck ; Has to be a multiple of 2
LD L,A
LD ...Help needed with calculating screen addressesCan anyone help me finally crack Jonathan Cauldwell's screen addressing calculator and, more to the point, is the reason I'm struggling because this …
...
ld a,(ycoord) ; fetch vertical coordinate.
ld e,a ; store ... br />
ld a,e ; 8 character ... B]
ld a,(xcoord) ; x coordinate.
understanding machine codeHi Quick question. Am not really sure if it fits development forum as its not really development per se its more a learners question about developm…
... S_PRINT POP HL
7E LD A,(HL)
23 INC HL ... /> AF START XOR A
323C5C LD (TVFLAG),A
CD0070 CALL ... using Zero emulator)
323c5c LD (TVFLAG), A
5c3c ... the expected result of LD (TVFLAG), A
A currently contains 00 ...DJNZ displacementHi I had a question about DJNZ operation. Just running through this code in MMCOYZXS by Toni Baker page's 87-88 [QUOTE]21A440 LD HL,40A4 11083F …
... LD HL,40A4
11083F LD DE,3F08
0608 LD ... br /> 1A LOOP LD A,(DE)
77 LD (HL),A
ld hl, $40a4
fa03: ... 11 08 3f ld de, $3f08
fa06 ... ld b, $08
fa08: 1a ld a, (de)
fa09: 77 ld (hl), a ...byte to screen eventI have another question regarding assembly routine in MMCOYZXS by Toni Baker page's 87-88 [QUOTE]21A440 LD HL,40A4 11083F LD DE,3F08 0608 LD B,08…
... LD HL,40A4
11083F LD DE,3F08
0608 LD ... br /> 1A LOOP LD A,(DE)
77 LD (HL),A
ld hl, $40a4
fa03: ... ld b, $08
fa08: 1a ld a, (de)
fa09: 77 ld (hl), a ... happen at:
77 LD (HL),A
But ...Double-Buffer ScreenFor my Alien Breed Speccy re-write I decided to use a Double Buffer (DB) or 'Back Screen' to draw all the game action onto, before shuffling the whol…
...
ld a,8
ld (cslice), a ;reset slice counter again
ld a, 32 ... a reg
add a,e
ld e,a
ld a,(dreg)
ld d,a ... field 3
ld (cfield),a
ld a,80
ld (dreg),a
jr ...TransversionJust been playing Transversion, and on Level 7, this happened:[IMG]https://dl.dropboxusercontent.com/u/9160090/Misc/Transversion.png[/IMG] szx here:[…
... /> Any ideas why? Is this a known bug?Optimal shifting for set pixel?Hi, I'm optimizing my set pixel code. For speed. But without using partitioned memory (i.e. a table on 256 byte boundary) I have optimal memory addr…
... br />
[CODE]
ld a,#x ; symbolic. a is x (0-> ... z
ld b,a ; our shift counter
xor a ; a=0
loop: rra ; to a
djnz loop ; until apropriate ... /> [/CODE]
Is there a more optimal approach to creating ...Problem with DivIDEHi There is a problem on ZX-Spectrum +2 (Grey Model) + DivIDE 2k14 here is video with problem [URL="http://www.youtube.com/watch?v=nIQboFo7Epc"]h…
... i_02
ld bc,#001f
in a,(c)
ld b,8 ...
i_03
ld (hl), ... d
add a,a
jr c ... ,$+3
ld (hl),e< ... br /> add hl,bc
ld a,h
cp #5b
Currah ?Speech channelIt seems to me that it would be nice to be able to send words to the ?Speech with PRINT #5;"Speak English to me, Jimmy" or some such. There really i…
... /> ld b, a
ld hl, (65362) ; buffer pointer
ld a, h ... /> ld d, 0
ld e, a
add hl, de ; allophone
ld a ... , (hl) ; get allophone
ld hl, (65362) ; address buffer
ld (hl), a ...Whatever happened to... Microprose?Loved their sims, loved their big box art and mahoosive instruction manuals. I remember buying Gunship for the Playstation1 in 1996 in an effort to …
... find the game riddled with a significant bug which prevented the gamer ...
