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How to print logo onto screen at chosen coordinates?Hi, I've just got back into zx spectrum games after all these years and after seeing some of the great games on here I would like to start learning p…
... refer to them. The "RANDOMIZE USR 60212" is to set up ... .
[code]
100 RANDOMIZE USR 60212
180 INPUT "text ... ):
LET bc=ox=(oy=(sx=(sy=(ds=(c+USR 60000))))):
Animated attribute revealA new challenge to solve next. I would like to create an animated attribute reveal in machine code by having my 768 byte attributes held in ram whic…
... 6144
44 RANDOMIZE USR 23296
45 ... c,b
push bc
ld b,32 ... push hl
push bc
ld b,24 ... starting column
pop bc
djnz REV0 ;done ...Deterministic random number generatorI'm looking for a random number generator in assembly which, given a seed, the generated sequence is always the same. You change the seed, you get a …
Patrik's XOR generator is a good one but it only generates 8-bit numbers (again a plus if that's all you want!). If you want random numbers larger than 8-bit you have to call the function several times and piece together the results, which degrades the ...Machine Code Routine of the weekHow about a thread that has a routine each week that is in [B]assembly language[/B] and is also described in great detail what the hell is going on …
[CODE]
ld bc, $5700
ld a, $aa[/CODE]
ld bc,$57[B]AA[/B]
ld a,c
also, as [B]Hikaru[/B] mentioned, after RANDOMIZE USR adr, BC=adr.
another trick:DIX register wonderings...***noob alert*** I'm doing a lot of these in my program: ld a,(ix+n) cp 0 jp z I know you can do things like this: dec (ix+n) but can you test …
... ]I'm using the Ix register in my game to organise ... ) using HL (or DE or BC) instead IX and accesing objects ...Is ESXDOS flexible enough to incorporate e.g. Spectranet commands?I was just discussing the idea with someone about the wish some people have to be able to combine interfaces such as DivIDE (Plus) / DivMMC EnJOY! wi…
... and identified in the A register.
[code]
...
cpi ; hl++, bc--
ld a,(hl ... br /> ; de = void *buffer
; bc = uint buffer_len
;
; return ...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…
... /> ; to load part 1, USR 24579
; to load ... part 2, USR 24576
; ... /> ; part 1 24800,40650; USR 25856
; part 2 ... 25088,40447; USR 51207
; ... :
di
ld bc,32765
ld (BANKM),a ...that "listing variables during runtime" thingWell, I did eventually finish this, but with my meds playing up I don't have much time each day that I can spend at the computer, so it's taken rathe…
LDI questionWhen using LDI (or LDD) is it possible to access the value that is transfered from (HL) to (DE), or does the Z80 use an internal data cache to store …
... doesn't use the A register or anything so the value ... result of the DEC on BC as a counter.LDI questionWhen using LDI (or LDD) is it possible to access the value that is transfered from (HL) to (DE), or does the Z80 use an internal data cache to store …
... and add the value of register A to it.
Call ... .
PF flag Set if BC not 0.
SF, ZF ... unused bits of the flag register) get 2 bits of info ... hardwork of subtracting the A register just not outputing the results ...LDI questionWhen using LDI (or LDD) is it possible to access the value that is transfered from (HL) to (DE), or does the Z80 use an internal data cache to store …
... ,with the value from the register that had just used to ... command that doesn't alter BC.We could design the LokiWouldn't it be great... if this community would develop what Sinclair himself started but was never finished: a successor of the 128K with 'cartoon l…
... complete Z80 register sets (i.e. 4 of AF, BC, DE, HL ... , AF', BC', DE', HL', IX ...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…
... ,16,20,24 etc
; BC is the current address of ... standing on
LD A,(BC)
LD L,A
register instead of BC this could be even ...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…
... through them with a spare register like IX.
Also ... Stack Pointer as an extra register and read/write two bytes ... at a time using AF, BC, DE and HL (8 bytes ... ' to swap to the alternate register set for another 8 bytes ...Fuller AY only gamesThe definitive list: 1) Demonstration Tape 2) Bodysnatchas 3) Star Bike
... /> ld de,$5c00
ld bc,801
ldir ;restore fuller ... a,b
push bc
ld bc,$fffd
out (c ... ),a
ld bc,$bffd
ld a,(hl ... /> out (c),a
pop bc
ret[/CODE]
USR 37146 then start the game ...Sorting BusinessThis is a little bit different from the usual game-related fare but I know there are a few people here who like this sort of thing. This is about so…
... i
push bc ; save size
push bc ; save size< ... k % size
pop bc ; bc = size
pop de ; de ... ll be using the R register for a quick random ...Sorting BusinessThis is a little bit different from the usual game-related fare but I know there are a few people here who like this sort of thing. This is about so…
... br /> ; hl = array_hi
; bc = size
; ix = compare< ... br />
add hl,bc
push hl ; save ... br /> insert_exit:
; bc = size
; ix = compare< ... exchange set. The R register is there, but ...AMX mouse emulationI'm trying to add AMX mouse emulation to Spud but not getting very far. I can get a reaction to button presses but nothing to moving the mouse. …
... way by using the I register as the high byte.
82ea c5 push bc
82eb d5 push de ... de
82fd c1 pop bc
82fe f1 pop af ... 3fh)
8305 c5 push bc
8306 d5 push de ...AMX mouse emulationI'm trying to add AMX mouse emulation to Spud but not getting very far. I can get a reaction to button presses but nothing to moving the mouse. …
... way by using the I register as the high byte.
82ea c5 push bc
82eb d5 push de ... de
82fd c1 pop bc
82fe f1 pop af ... 3fh)
8305 c5 push bc
8306 d5 push de ...Fast and easy read/write of attributes?What are the fastest or easiest ways to check the attributes of tiles on the screen, in BASIC? It seems to be a great way of storing object info. …
... as needed in basic then USR to whichever jp I need ... /> ld e, a
ld bc, (byteloop)
; hl = attr memory ... = attr value to poke
; bc = number of times to poke ...
inc hl
dec bc
ld a, b
DSK version of Terramex?I'm trying to make a DSK version of Terramex, but game refuses to load. The problem is probably in a protected loader (302 bytes), but I wasnt able …
... forget to do
ld bc 29184
call 29184
40 RANDOMIZE USR 29184, but just in this ... works good in 48k mode (usr 0), but in 128k mode ...Drawing a dotted line...Hi Folks, I cannot be the first person to want this (?) so here goes! Does anyone have a MC routine that does the same as the BASIC DRAW command bu…
... 255,0: LET bc=-255=175+USR DOTS: REM DRAW ... 255,175: LET bc=-255=-175+USR DOTS
40 ... 127,0: LET bc=0=175+USR DOTS
50 ... 0,87: LET bc=255=0+USR DOTS
70 ... EXX
POP BC
PUSH BC
JR L_24DF
Drawing a dotted line...Hi Folks, I cannot be the first person to want this (?) so here goes! Does anyone have a MC routine that does the same as the BASIC DRAW command bu…
... PLOT 255,0: LET bc=-255=175+USR DOTS: REM DRAW coords ... PLOT 255,175: LET bc=-255=-175+USR DOTS
40 PLOT ... 127,0: LET bc=0=175+USR DOTS
50 PLOT ... 0,87: LET bc=255=0+USR DOTS
70 PAUSE ...RTC module for DIVIDE[IMG]http://velesoft.speccy.cz/other/rtc_module_v01_full_top.jpg[/IMG] [IMG]http://velesoft.speccy.cz/other/rtc_module_v01_full_bottom.jpg[/IMG] [IMG…
... used for select number of register in RTC chip. All RTC ... fire buttons
;and in register B will always state of ... (C)
RETURN LD (JOYDIR),BC
EI
RET
Block RoutineHi Folks, I want to draw a block on the screen dependent on providing the X,Y,W,H values. I came up with the following: [CODE]100 LET l$=" …
... a(x,y,h,v)=USR 63000
2 REM ... )
LD BC,4
ADD HL,BC
LD ... D,(HL)
LD BC,ERROR-1
ADD HL ... LD B,A
PUSH BC
63061 PUSH HL
PUSH BC
PUSH HL
... /> POP HL
POP BC
INC H
...Block RoutineHi Folks, I want to draw a block on the screen dependent on providing the X,Y,W,H values. I came up with the following: [CODE]100 LET l$=" …
... (x,y,w,h,a)=USR 63000
110 INPUT "Row ...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…
... it to address in register pair (hl,bc) ?
Psss, secret ...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…
... it to address in register pair (hl,bc) ?[/QUOTE]
Sure ... address pointed by HL or BC?
[QUOTE=DenisGrachev;782500 ...Manic Miner loading screen adjustmentHad half an hour spare earlier and wanted to try a few things. Always like to learn anyways even now. [URL="http://www.yellowspider.co.uk/speccy/Man…
... (see below)
LD BC, 20 ; to a part of ... start the game ie a USR 33792[/code]
A ...Definitive list of games incompatible with +2A/+3 and of compatible versions (if any)I am trying to compile the definitive list of games which are incompatible with the +2A and the +3 and of their compatible versions, if they are pres…
... 128 BASIC, 48 BASIC and USR 0 mode.[/QUOTE]
register I=#39). Here is fixed ... version of game with new register I value #3B working on ...
