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Learning Assembly LanguageHow easy would it be to learn assembly language for someone who has a decent grasp of Basic? I mean how long do you think it would take before I coul…
... ld hl,16384 ; Screen address
ld bc,6144 ; Screen length
ld ... /> inc hl ; Next screen location
dec bc ; Length = length - 1 ... pixels
line pop hl ; POP screen line address from LPT
Printer Printing Problem (assembler)I've a program that outputs to the lower screen at various places, using a combination of calls to RST $10 plus OUT-NUM-1 and PR-STRING. It also call…
... number of lower screen display routines which I ...
...
;print BC 3 digits padded
PRIN3N ... /> rst $10
pop bc
ld hl,-10
rst $10
pop bc
PRINTN: call OUTNUM< ...Printer Printing Problem (assembler)I've a program that outputs to the lower screen at various places, using a combination of calls to RST $10 plus OUT-NUM-1 and PR-STRING. It also call…
... a number of lower screen display routines which I ...
...
;print BC 3 digits padded
PRIN3N ... br /> rst $10
pop bc
ld hl,-10
rst $10
pop bc
PRINTN: call OUTNUM< ...Hacking the O.C.P Full Screen Editor/AssemblerIf you have been reading my posts recently then you will know that I am eager to have the sourcecode I wrote for the Spectrum during the period 1988 …
... to point to screen
ld l,a
pop bc ; Draw 1st ...
inc h
pop bc
ld (hl),c
inc h
pop bc
ld (hl),c
pop bc
ld (hl),c ; ...
inc h
pop bc
ld (hl),c
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 …
...
; Prints characters directly to screen bypassing ROM calls
; WARNINGS ... for wrapping past bottom of screen
;
; On ... br /> ; On exit, A/BC/DE/HL corrupted
screen attribute
POP HL ; Get print position ...Transferring games into MicrodriveLast week a big pack of empty microdrive cartridges arrived, and now I'm ready to playing with my little microdrive equipped speccy. One of my aim w…
... my previous method using the screen to store the boot code ... />
db 241 ; pop af
db 209 ; pop de
db ... 225 ; pop hl
db 193 ; pop bc
db 217 ... the above method currupting the screen (this new method does not ...Learning Assembly LanguageHow easy would it be to learn assembly language for someone who has a decent grasp of Basic? I mean how long do you think it would take before I coul…
... ld hl,16384 ; Screen address
ld bc,6144 ; Screen length
ld ... /> inc hl ; Next screen location
dec bc ; Length = length - 1 ... pixels
line pop hl ; POP screen line address from LPT
Learning Assembly LanguageHow easy would it be to learn assembly language for someone who has a decent grasp of Basic? I mean how long do you think it would take before I coul…
... ld hl,16384 ; Screen address
ld bc,6144 ; Screen length
ld ... /> inc hl ; Next screen location
dec bc ; Length = length - 1 ... pixels
line pop hl ; POP screen line address from LPT
Supertest 128 - Loader QuestionI wonder if someone could explain (in simple terms please) :) , the purpose of the switch code. I see what is doing (going to 48k mode via spectrum)…
... contains, in order, the title screen, then memory banks 0,1 ... 32h, 33h)
; 2. Load screen at 0x4000: 0x1B00 bytes
screen.
out (c),a
ei
pop af ... ),a
ei
pop bc
pop af
ret
;
Sprites masterclassHi All, You guys are probably tired of explaining sprites but I'd like to clarify a few things if possible. I've sorted the vertical aspect of scro…
...
The demo clears the screen, builds the tables, runs bank ...
call put_blanksprite
pop hl
jr demoa3
put_blanksprite1 push bc
exx
pop bc
exx
ld d,a
pop bc
exx
ret< ...SE Basic Type-ins^Pete suggested creating a sticky thread for SE Basic discussion. I thought a Type-ins thread might also be useful. Up to the mods if they want to ma…
... doit1 ;
pop af ;
pop de ;
pop bc ;
pop hl ;
... the
ld (chrad), hl ; screen and calculate the address in ... position, place it on the screen
and a ; one ... left hand side of the screen.
ld a, (coords_y) ...50Hurts - Full-screen 50Hz 1-pixel scrolling on a 128K Speccy50Hurts - Full-screen 50Hz 1-pixel horizontal scrolling on a 128K Speccy. Graphics are an obvious nod to Joffa, whose games and banter were a big ins…
... ,hl
pop hl
; HL now holds screen$ address
byte_A1D8 ... sp,iy
pop bc
pop de
pop af
exx
;; sample screen pusher
;; fill 28 bytes ...Small Machine Code Routines Which Maybe UsefulAs part of creating Flynn's Adventure in Bombland I created a lot of little routines to do all sorts of things. A lot of these I created based on inp…
... plot double sized character on screen
; input - ... ; **********************************
; xy coords to screen pixel position
; **********************************
; *************************************
pop bc ; 10t
ld a ...Jet Set Willy II - collecting objectsThe POKE to reduce the number of objects you need to collect doesn't seem to work. [CODE]POKE 34686,1[/CODE] It looks correct. It changes the CP 150…
... go to the master bedroom screen (then the code is run ... A,B ;quicker than PUSH BC
LD L,(IX+0 ... /> LD B,A ;quicker than POP BC
DJNZ $75EA
RET ...Proportional Print Routine...Hi Folks, Does anyone know of a good proportional printing routine for the ZX Spectrum? Ideally I am looking for something that prints with charact…
... DOIT1
POP AF
POP DE
POP BC
POP HL
... ,181 ; mod to access lower screen
SUB B
... 182 ;mod to access lower screen
JP NC,ERR5< ...Serial protocol, help!Hi, simply trying to find best way to transfer programs from PC to real ZX Spectrum for testing purposes. Under Windows I tried using Spxfr and it w…
... . the main loop sends the screen (SCR) bytes to the pc ... , 0x1b00
_main: ;; send screen bytes at 115.200 bauds ... /> send: push bc
call _rs232_write
pop bc
dec bc
ld ...Frank N SteinThis one > [url]http://www.worldofspectrum.org/infoseekid.cgi?id=0001849[/url] Always seems to crash about level 7 (maybe a bit more) or so with an …
... 's stuck in the printer buffer). Here's the assembler for ... ]
org 23480
PATCH: POP BC ;discard unused return address
Proportional Print Routine...Hi Folks, Does anyone know of a good proportional printing routine for the ZX Spectrum? Ideally I am looking for something that prints with charact…
... , clears the area of screen you're about to print ... doit1 ;
pop af ;
pop de ;
pop bc ;
pop hl ;
... /> ld (chrad), hl ; on the screen and calculate the address
screen.
ld a, (coords_y) ;< ...fast font engine possible?inspired by the recent "proportional font" thread for zx basic and ideas for gui and having done some of the work on this in the past i wonder if it …
... br /> .yposOk:
; calc screen address
; A is ypos ... br /> pop af
pop bc
pop de
pop hl
pop ix< ...
; scroll the whole screen one line up
call ... printing routine expects a blank screen line and does no ...Frank N SteinThis one > [url]http://www.worldofspectrum.org/infoseekid.cgi?id=0001849[/url] Always seems to crash about level 7 (maybe a bit more) or so with an …
... that anyway on the options screen).[/QUOTE]
You might ...RFC: 64 column font codeIn BASIC, type CLEAR 49999 then import the code at 50000. Then type RANDOMIZE USR 50000. This will create a new channel and attach stream #4 to it. A…
... the MAKE-ROOM routine
pop bc
ld hl, CH_DATA + ... 00001111 ; mask half of the screen byte
or c ; ... result back to screen
inc d ; next screen location
...RFC: 64 column font codeIn BASIC, type CLEAR 49999 then import the code at 50000. Then type RANDOMIZE USR 50000. This will create a new channel and attach stream #4 to it. A…
... the MAKE-ROOM routine
pop bc
ld hl, CH_DATA + ... 00001111 ; mask half of the screen byte
or c ; ... result back to screen
inc d ; next screen location
...RFC: 64 column font codeIn BASIC, type CLEAR 49999 then import the code at 50000. Then type RANDOMIZE USR 50000. This will create a new channel and attach stream #4 to it. A…
... the MAKE-ROOM routine
pop bc
ld hl, CH_DATA + ... 00001111 ; mask half of the screen byte
or c ; ... result back to screen
inc d ; next screen location
...Tile based graphics and scrolling thingy...Here's my best attempt so far at a tile based rendering and scrolling routine. It draws in 22 8*8 graphics tiles along the top of the screen (junk i…
... ld (hl),a ; Write to screen (7)
inc ... position_var ; Point to next screen position before POPing HL< ... />
pop af
pop bc
pop de
pop hl ;
... br /> scrntab defw 16384 ;screen address table
defw ...Tile based graphics and scrolling thingy...Here's my best attempt so far at a tile based rendering and scrolling routine. It draws in 22 8*8 graphics tiles along the top of the screen (junk i…
... blank out the screen by pointing SP ... bc ; 11
exx ; 4
pop af ; 10
pop bc ... ; 10
pop de ; 10
pop hl ; 10 - POP ... de ; 11
push bc ; 11
push af ...line, plot and circle in whole 256x192 displayhi! are there some way to draw lines, or whatever, in the whole 256x192 display, than just the above 256x176 part? (this is the msx1 version i made o…
...
CALL doplot
POP BC
EX (SP),HL ; ... LD H,B ;now HL = screen addr
AND %00000111 ;now ... LD (HL),A ;move to screen
POP HL ;coords
RET ...
