-
Text scroller and custom fontYesterday I was testing this text scroll routine taken from Jonathan Cauldwell's Intro Maker (labels have been inserted to allow partial code relocab…
... ,A
LD A,B
AND 248
LD E,A
LD A,(PUNTO_A)
LD ... C,A
LD B,008
L_35459: LD A ... -
ANN: Tipshop updated Sunday, 31 January 2016Sunday 31 January 2016 Happy New Year (bit late? Ed) * The more perceptive may notice the NUMBER of tips hasn't changed in any significant way s…
... entries.
This involved a fair bit of cross-referencing ... br />
* Mike_Myers provided a map, bug report, partial solution, tips and ... and tips for Everyone's A Wally.
* Andy ... .
* PopCop provided a tip for Stranded 2.5 ... -
Help! I'm learning Machine Code...Having decided to take the plunge and learn to machine code a while ago, I have started in earnest using the much recommended 'Mastering Machine Code…
... 's quite the challenge for a noob:
... and conditional instructions, write a program which will PUSH ... and then somehow manage a successful return to BASIC ... br /> LD (5CB0), SP
LD B, 01
LD A, B ... JR NZ, 5
LD SP, (5CB0)
RET< ... -
Simple bit of machine code not working [SOLVED]ishHi all. It's late and I'm tired and I have no idea why the following piece of code wont display a little smiley face [code]ld hl,udg ld (236…
... a little smiley face
[code]ld hl,udg
ld ... (23675),hl
ld a,2
call 5633
ld a,144 ... -
New Retro Virtual Machine v1.1.0Hello everyone, a new version of Retro Virtual Machine https://www.youtube.com/watch?v=vDXHnelI49A Change Log: Added the ZX Spectrum+ with s…
... curvature etc.
Added a new video effect in ... an update advice if a new versión is ... default now.
Fixed a bug that hid the tape ... in some circumstances. Fixed a bug in the TZX loading ... works now).
Fixed a stupid bug in the port decoding, ... -
Function with push and popIm trying to see if I understand push and pop when it comes to using to pass parameters to functions: [code] LD HL,16384 LD A,5 Push AF Ld A…
... />
LD A,5
Push AF
Ld A,7
Push ... /> LD (16386),A
addfunc:
pop af
LD (16384),A
LD ... B,A
pop af
LD (16385),A
ADD A ... -
Add with Carry ExampleHi, I have been really struggling to understand this simple example from Mastering Machine Code and I wonder if anyone can help? I have include…
... /> LD A,L ;A = 7B
ADD A,E ;A = 7B + 33 = AE
LD L,A ... ;L = AE
LD A,H ;A ... = C7
ADC A,D ;A = C7 ... -
Z88DK NOOB cplot INK colorHi I am a complete NOOB with Z88DK, I am trying to draw colored circles. How does ink, paper and border work with Z88DK. I started trying to wo…
... ld a,7
and d
ld b,a
inc b
ld a ... /> xor e
ld h,a
ld a,d
xor l ... rrca
rrca
ld l,a
ld a,1 ; one
PLOTBIT ... -
Basic Screen Shadow QuestionHello, I've been porting a game to the Spectrum from another platform. So far so good and I have per pixel screen scrolling working really nicely …
... be displayed.
change_bank:
ld a,(0x5b5c) ;previous value of port ... hl
dec de
ld a,d
or e
dec de
ld a,d
or e
IXL and IXHI don't know much about undocumented instructions but I get the impression that [b]LD A,IXH[/b] or [b]LD A,IXL[/b] (B, C, D, E also fine, HL not) are…
I don't know much about undocumented instructions but I get the impression that [b]LD A,IXH[/b] or [b]LD A,IXL[/b] (B, C, D, E also fine, HL not) are perfectly safe to use on any Spectrum model or clone.
Is that right?Must be missing the point - machine code... Hi Folks, Trying my hand at machine code again but falling at the first hurdle. I hand crafted the following to run at address 62000 and the co…
... />
[code]
LD A, &FF
LD HL, &4000
LD B, &18< ... ;FF
Loop2:
LD (HL), A
INC H
DEC ... br /> JR NZ, Loop2
LD H, &00
INC ...Mastering flagsI'm little lost when different flags are set/reset after logic operations, and what conditions must be met. For example, [code] ld a, MODE…
Why doesnt this work???Simple piece of code wont do as it should, just want to fill the top 22 lines of screen with an attribute value (150) but it wont have any of it. Som…
... /> ld de,22528
ld bc,704
loop
ld a,150
ld ... (de),a
inc de
Flicker-free animationTrying to create flicker-free screen update, but... Where I'm wrong? [url="https://dl.dropboxusercontent.com/s/pfywhfejfmwt2zq/test_128.sna"]Snaps…
... />
ld a, (keeper)
rrc a
ld (keeper), a
ld (hl), a
ld a, 0x17
xor %0010
ld (swap_video+1), a
ld bc ... , BANKS
out (c), a
ALIEN (Mindgames) Bugfix and Improvement.[code]ALIEN (Mindgames) [ZX SPECTRUM] BUGFIX & IMPROVEMENT by Ersh 2016-10-29 The following bugs are fixed: [BUG] INVENTORY BUG WHEN SWITCHING …
... br />
[BUG] INVENTORY BUG WHEN SWITCHING CHARACTERS DURING AN ... br />
[BUG] INVENTORY BUG WHEN SWITCHING CHARACTERS DURING AN ... routine.
[BUG] 100% COMPETENCE RATING.
... displayed twice in a row.
[BUG] IF YOU ...Satan from Dinamic gets stuck at the end of the second loadHi friends, doing a longplay of this game I used the files from this site. The most of then seem to have a bug, but I'm not sure if is an emulation b…
Hi friends, doing a longplay of this game I ... of then seem to have a bug, but I'm not sure ... if is an emulation bug or a native bug. I've played with ... somebody played this game in a real spectrum, and if this ...Starting lives for Space Raiders ?:) I was wondering if anyone could point me in the right direction for this please. I've examined the code quite a bit but I'm unable to quite figur…
... [/b] LD (65535), A
[b]25955[/b] LD (65330), A
... NOP
[b]25959[/b] LD A, (24611)
[b]25962 ... lt; Lose a life
[b]25963[/b] LD (24611), A
... :D , I have a feeling with this the answer ... effect (changing DEC A to INC A is an easy ...SUB and the S flagGuys, if I use SUB to take a value HIGHER than is currently in A, does the S flag get set? I know that N does. [code] LD H,33d LD A,32d SUB H …
... I use SUB to take a value HIGHER than is currently ... in A, does the S flag get ... />
[code]
LD H,33d
LD A,32d
SUB H ... , how do I test if A goes below zero?
IF ACode optimisation! 16bit number to 5 digit stringJust for interest this one, any thoughts on how to make this as fast as possible? Little optimisations to this routine or a complete reimagining? …
... straddle word boundary
ld b,'9'+1 ;preload ... with column overclock
ld c,l ;end of ... ;increase string number
ld a,(hl)
cp b ; ... jp c,cont
ld (hl),'0' ;yep,reset ... decrease number counter
ld a,d
or e< ...Fast way to clear the screen ?So I was wondering fastest way to clear the screen. I've tried this and this works but is it better than CLS ? LD HL,16384 LD BC, 6144 Loop…
... /> LD HL,16384
LD BC, 6144
Loop:
LD A,0 ...
LD (HL),A
INC HL
DEC BC
LD A ...Random Numbers, USR Return Values & Timing BASICI've been trying out Jon Ritman's random number routine, published in Your Sinclair Aug'87. Apart from a timing comparison I also did a frequency ana…
... simply add the instruction LD DE,(SEED+2) ... br /> [code]
LD bc,(SEED)
call ... ;restack,end_calc
LD A,(HL) ;Fetch the exponent ... last value'
LD (HL),A ;by 65536 to give ... floating point decimals, a slightly trickier trick allows ...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 …
... attribute address
ld a,(hl) ; get attribute
ld (de),a ; put attribute ... $82 ; 07ts
ld ixh, a ; 08ts
ld a, nextpix-aa2sa ; 07ts ; patch ... data byte
ld a, ixh ; 08ts ; (timing)
ld a, $00 ; 07ts ; < ...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…
... ; interrupts off as a precaution.
ld a,254 ; high byte ... ld a,#255
ld hl,$4000
ld (hl),a
ld a,#255 ... br /> ld a,1
ld hl,$4000
ld (hl),a
ld a,3
ld hl,$4000
ld (hl),a
SpecBAS 0.905 Released...I said I shouldn't have done it, so now I have to release an update to fix the bugs I missed but that my valiant testers discovered! Here's what's…
... banks
Fixed a weird bug where shifted characters (& ... such as a carriage return
Fixed a bug where spaces would ... appear after a line number in a new ... line
Fixed a bug where ...Mojon Twins MK2 and lighting effectsDoes anyone have any experience in getting the overlay.h working in the MK2 engine. There were several games written in the churro that used the ove…
...
ld a, (_ovl_y)
ld h, 0
ld l, a
add ... * 36
ld a, (_ovl_x)
ld d, 0
ld e, a
add ...
ld a, (_ovl_y)
ld h, 0
ld l, a
add ...how does this multiplication routine work?taken from chuntey wordpress: imul ld e,d ; HL = H * D ld a,h ; make accumulator first multiplier. ld …
... d ; HL = H * D
ld a,h ; make accumulator first multiplier ... .
ld hl,0 ; zeroise total.
ld b,8 ; repeat 8 ...New Windows Spectrum Emulator: CSpect V0.2 ZXSpectrum emulator by Mike DaillyNew Windows Spectrum Emulator: CSpect V0.2 ZXSpectrum emulator by Mike Dailly (Found on SpecNext Facebook-Page) Info and Download (=klick "CSpe…
... /> ld a,22
out (c),a
ld a, ; 0 to 255
ld bc ... , $253B
out (c),a ... /> ld a,23
out (c),a
ld a, ; 0 to 191
ld bc ...what is wrong with this loop?here is the loop: ld b,12 ld a,31 ld de,right_screen_array right_screen_array_label call charaddress ex de,hl ;de now contains screen address…
... :
ld b,12
ld a,31
ld de,right_screen_array
ld (hl),e
inc hl ...
ld (hl),d
inc hl ... result in HL, it uses a for the xcoord and b ...
