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I am currently playing......Don't know if there's been a thread like this, but I can't find one.... Having seen all the different threads asking people if they've played such a…
... ;717589]I had a real c**t of a time catching Sweet, ... just wrong wrong wrong, I'm not doubting your mighty skillz ... , but I'm pretty sure you were very ... lucky getting that awkward c**t first time :p[/ ... have been. it took me a while to catch up, ... -
Movin And A Groovin Horizontal Flip improvementOn the left is the flip horizontal portion from Andy Pennell'S excellent Movin' & a Groovin' machine code screen routines from Your Spectrum #19 (Oct…
... ld a,(de)
ld c,a
ld a,(bc)
ld c,(hl ... I can understand it (I'm still learning mc)
... LD (HL),A
LD A,C
LD (DE),A
DEC ... -
Can a guy that traveled on the short bus learn machine code...Hmmm So after some soul searching I figured it was time to finaly nail spectrum machine code. Its so frustrating to sit infront of a basic listing w…
... really going to make a difference? Edit: Just ... save anything but I'm not sure how practical ... parameters when indexing into a list of function pointers. ... example is device driver. A subroutine that needs to ... is an offset into a table (C++'s vtable) or ... -
The Pros and Cons of "alternative" assembler syntaxContinuing from [URL]http://www.worldofspectrum.org/forums/showpost.php?p=720754&postcount=72[/URL] [QUOTE=u6c87;720754]But that wouldn't change if…
... QUOTE=aowen;720794]Is there a good reason why people don' ... backend might be modified. I'm not sure if gas and ... linker can already do everything a z80 C compiler might want to ... linear address spaces rather than a more limited potential bankswitched / ... -
The Pros and Cons of "alternative" assembler syntaxContinuing from [URL]http://www.worldofspectrum.org/forums/showpost.php?p=720754&postcount=72[/URL] [QUOTE=u6c87;720754]But that wouldn't change if…
... /> ADD A,B A+B +B
ADC A,C A+*C +*C
SUB A,D A-D ... -D
SBC A,E A-*E ... A,(HL) A^[HL] A^[H] A^M ^[HL] ^[H] ^M
CP A,A A:A :A :
ADD ACompiler conventions for passing args/return valuesI've been mulling over this for a while, but I can't spot it covered anywhere. There are various methods for passing args and return values between …
... ;721271]
What I'm thinking about is something like ... . This involves a trip to the A register ("sbc a,a; and 0x01 ... )
#define utoa(a,b,c) utoa_callee(a,b,c)
[/code]
a,b,c)" with "utoa_callee(a,b,c)" but leaves ...Compiler conventions for passing args/return valuesI've been mulling over this for a while, but I can't spot it covered anywhere. There are various methods for passing args and return values between …
... write my own compiler". I'm not about to invent my ... ;721316]
Bools are a very inefficient type on the ... saved. This involves a trip to the A register ("sbc a,a; and 0x01 ... occurrences of "utoa(a,b,c)" with "utoa_callee(a,b,c)" but leaves occurrences ...Compiler conventions for passing args/return valuesI've been mulling over this for a while, but I can't spot it covered anywhere. There are various methods for passing args and return values between …
... using the carry flag as a bool return, in the case ... immediately hits either a "jr c, error_cleanup" or a ret c.[/QUOTE]
m guessing it matches up with ...Compiler conventions for passing args/return valuesI've been mulling over this for a while, but I can't spot it covered anywhere. There are various methods for passing args and return values between …
... ) is better replaced by "sbc a,a" (4 cycles) which can later ... done -- I'm just saying no one has a z80 backend that ... with this. What I'm thinking is if that parameter ... code. For vararg functions, a target C function will have to place ...Compiler conventions for passing args/return valuesI've been mulling over this for a while, but I can't spot it covered anywhere. There are various methods for passing args and return values between …
... with this. What I'm thinking is if that parameter ... code. For vararg functions, a target C function will have to place ... (and probably code size). I'm going off the idea :-)
m not sure whether there should ...ZX Spectrum clock signals comparedI haven't searched for this on WoS; it might have been posted before. But I think it's important info, and can't do any harm to repeat or show from a…
... is inverted by a transistor switch to provide a clean clock edge ... by a R/C delay and ZTX313.
I'm curious what 'a clean ... .
I mean: this R/C delay and NPN transistor should ...ZX Spectrum clock signals comparedI haven't searched for this on WoS; it might have been posted before. But I think it's important info, and can't do any harm to repeat or show from a…
... is inverted by a transistor switch to provide a clean clock ... by a R/C delay and ZTX313.
I'm curious what 'a ... /> I mean: this R/C delay and NPN transistor should ... from and there's a possibility that I just ... that I only own a +3 and a couple of 48ks - ...What would be the simplest tape loading routine?I'm searching for some small assembly snippet I can use to load a (headerless or not) block from tape into RAM I can embed in my C games to load furt…
... ,length
scf
ld a,255
jp #556
A BASIC error would crash the ... would be running it from M/C with my own ISR.
What would be the simplest tape loading routine?I'm searching for some small assembly snippet I can use to load a (headerless or not) block from tape into RAM I can embed in my C games to load furt…
... what happens if it fails? A BASIC error would crash the ... would be running it from M/C with my own ISR.[/QUOTE ...Completely free games?Hi, I would like to know if there are any open source or completely free games for ZX Spectrum. Or at least some other free programs without any lin…
... of copyright. what about the M/C. as I see it there ... code to do anything in a game must have been ... I know taking a game and just changing a few things would ... if you take a bit from here a line from there ... />
PRINT AT 0,0;"a" ? Ardentcrest 2013 :D
...ANN: Atic Atac ... now on Windows 8....Ladies and Gentlemen and those of you undecided :) Atic Atac is now in the Windows 8 Store, (WinPho version was released a couple weeks ago). [URL=…
... "FOUL!", and that player is a competitor to Elite Systems, shouldn ... by the rights owners (even a simple C&D, which costs ... little more than a stamp) implies they ... the book.
I'm ready to be proven wrong ...SE Basic IV Buffy v4.1 source (WIP)I've been doing a major refactor on the SE Basic source and I'd appreciate a code review from anyone who has time to look at it. I've almost certainl…
... 0x0296
key_line:
in a, (c) ; read ULA
cpl ...
ld (hl), a ; store A
inc hl ; ... for meta
ret m ; return if normal
add a, 79 ; CTRL+"A" = UDG A
ret ; ...SCREEN$ bug fixI've been using the SCREEN$() function recently for reading data off the screen rather than taking up space with an array and I got fed up with the s…
... resolving this ambiguity which I'm not seeing.
extract ...
sla a
sla a
sla a
ld c,a ;C =bitmap offset ...SE Basic IV Buffy v4.1 source (WIP)I've been doing a major refactor on the SE Basic source and I'd appreciate a code review from anyone who has time to look at it. I've almost certainl…
... e_save:
push af ; stack m
ld hl, membot ; ... br /> pop af ; unstack m
jr e_loop ; loop ... /> fce ; x * 10^m
ret ; end of subroutine ... a ; in
ld c, a ; A, E, D, C, B
xor a ; ...SE Basic IV Buffy v4.1 source (WIP)I've been doing a major refactor on the SE Basic source and I'd appreciate a code review from anyone who has time to look at it. I've almost certainl…
... ; increase count
jp m, div_loop ; loop until done< ... a, a ; set sign
ld c, a ; store sign in C
inc a ... 8
add a, b ; restore A
jr c, t_test ; jump ...
ld c, a ; store in C
ld a, d ; D ...SE Basic IV Buffy v4.1 source (WIP)I've been doing a major refactor on the SE Basic source and I'd appreciate a code review from anyone who has time to look at it. I've almost certainl…
... counter
ld a, c ; discriminator byte to A
cp % ... /> and a ; test error register
jp m, report_3 ; ... /> l_spaces:
ld a, c ; length to A
ld hl, ... ; swap pointers
ld a, c ; test
or b ...SE Basic IV Buffy v4.1 source (WIP)I've been doing a major refactor on the SE Basic source and I'd appreciate a code review from anyone who has time to look at it. I've almost certainl…
... ; string parameters
ld a, c ; test for
or ... int (n/m), m
fxch ; n, m, int (n/m)
... m)
fmul ; n, m * int (n/m)
fsub ; n - m * int (n/m ... )
fgt 1 ; n - m * int (n/m), int (n/m ...SE Basic IV Buffy v4.1 source (WIP)I've been doing a major refactor on the SE Basic source and I'd appreciate a code review from anyone who has time to look at it. I've almost certainl…
... 255
and a ; test it
ret m ; return if no ... -NEXT variable?
jp m, next_o_1 ; jump if so
... a, c ; C to A
cpl ; one's complement
ld c, a ; A to C
A new full-screen bicolor engine called NIRVANA[I]OK, there's something I need to clarify first: Nowadays if you write [B]"multicolor"[/B] everyone assumes it refers to "multicolor 8x1" (an attri…
... -O3 -o $Z80EXECNAME.bin -m -zorg=24576 -create-app $Z80EXECNAME ... .c -lndos -lm -lnirvana
# RAMTOP $5FFF
# -m create ... map file for debugger
zcc +zx -a $Z80EXECNAME.c
# -a ... hasn't failed with a fatal error) and then ...Cross platform developmentI'm just vaguely considering supporting a few more retro 8 bit platforms for something I have in mind to do. Just Z80 and 6502 really, but that cove…
... /> Yep. I know 6502 is a bit limited in that respect ... /> But I suppose if I'm going to learn 6502 anyway ... I might as well get a start by doing the easy ... maybe I should just have a simple C layer for the glue ...bit manipulation conundrumWhat's a neat way to change this bit pattern in registers BCDE: [code]Loop0: ;change B:00000000 C:abcdefgh D:ijklmnop E:qrstuvwx[/code] to this bit …
... A ;A=0000 abc0
RL C ;C=bcde fgha, CF=a
RL C ;C=cdef ... C ;A=0ghi 0000
LD C,A ;C=0ghi 0000
LD A,D ;A=nopi ...
RRA ;A=no0p 0000, CF=m
RRA ;A=mno0 p000, CF ... =0
RRA ;A=0mno ...A "generic" loader for +3(e)I've made this loader for 128k games in +3DOS. [CODE]dos_open equ 262 dos_close equ 265 dos_abandon equ 268 dos_read equ 274 dos_write equ 277 dos_s…
... inicio
ld a,$07
call paginar
and 7
ld c,a ; Here goes the page to ... call dos_close
ld a,$10
call paginar
ld (BANKM),a
out (c),a
ei
... except the changes (I'm spaniard, and I've ...The Elite ZX Spectrum bluetooth keyboard and their implementation of key ghosting.They have plans to release it September 2014. [url]http://bluetoothzxspectrum.elite-systems.co.uk/index.php[/url] They have also a Kickstarter page,…
... keys at F0 (keys A,B or C) which would output ... I'm scanning F0 to see if A, B or C are ... F0 propagates through D0 because A is pressed. From there, ... it believe that keys A and C have been pressed instead ... of only A!
[img]http ...
