-
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…
... - the improved SCREEN$ routine assembler listing:
[url]http:// ... r & k and BC=ScrDol0 prior to the call ... Part the 4th - the streamlined print routine assembler listing:
[url]http ... 5th - the relocation routine assembler listing:
[url]http ... -
What Z80 development tools do you use? What books?Hi. I've been meaning to do it for over 25 years, but.. better late than never :) I'm starting to learn machine code and am trying to get a developme…
... has a fairly user-friendly assembler and you can test your ... ;
ld c,a ;load bc with a
push af ... a bit
call 6683 ;print bc
ld a,13 ;
rst 10h ;print Return
pop af ;get ... -
What Z80 development tools do you use? What books?Hi. I've been meaning to do it for over 25 years, but.. better late than never :) I'm starting to learn machine code and am trying to get a developme…
... br /> ld c,a ;load bc with a
push af ... bit
call 6683 ;print bc
ld a,13 ... ;
rst 10h ;print Return
pop af ; ... doesn't destroy the BC pair? If so, ... dealing with low level skuzzy assembler :confused:
... -
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…
... ROM does in $203c ;PR_STRING "print BC characters from DE". The character ... TO 164
20 PRINT AT 21,0;CHR$ c ... $: NEXT y
55 PRINT AT 21,0;" ";AT 8 ... +1) THEN PLOT x,y: PRINT x;",";y;" ";
80 ... /> I'll knock up an assembler routine to use the data ... -
problem with DEFADD storageI have a function: DEF FN t(t$,m,t)=USR t which is called with, for an example: LET bc=FN t("t$()",mcworkspace,mcputt) where, at the time: mcworkspac…
... with, for an example: LET bc=FN t("t$()",mcworkspace,mcputt ... $,m,t)=m, and then print bc, it returns 65368. -
checking bits in BASICThe question of manipulating bit patterns in BASIC was raised recently in this [thread=35728]Keys redefine routine and key check[/thread] thread. I s…
... LET bc=0: PRINT bc;"=";: PRINT ,FN b$(bc,10,2,8):
LET bc=bc+1 ... 0011000000111001) then:
[code]
PRINT FN b$(FN h(12345 ... the reverse:
[code]
PRINT FN b$(00110000,2,10 ... -
What Z80 development tools do you use? What books?Hi. I've been meaning to do it for over 25 years, but.. better late than never :) I'm starting to learn machine code and am trying to get a developme…
... />
ld c,a ;load bc with a
push af ... a bit
call 6683 ;print bc
ld a,13 ;
rst 10h ;print Return
pop af ;get ... 6683 doesn't destroy the BC pair? If so, then you ... -
What Z80 development tools do you use? What books?Hi. I've been meaning to do it for over 25 years, but.. better late than never :) I'm starting to learn machine code and am trying to get a developme…
...
ld c,a ;load bc with a
push af ... a bit
call #2f86 ;print bc, also set B=0
rst 10h ;print Return
pop af ;get ... -
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…
... $10
ret
...
;print BC 3 digits padded
PRIN3N ... hl,bc
jr c,PRINTN ;BC>=100
push bc
rst $10
pop bc
ld hl,-10
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…
... $10
ret
...
;print BC 3 digits padded
PRIN3N ... hl,bc
jr c,PRINTN ;BC>=100
push bc
rst $10
pop bc
ld hl,-10
Print TextHow do i print text on the bottom left row(memory location in attribute 23295) of the screen in assembly? I understand the parts better on paper and …
... only use the ROM print BC routine to print values less than 10000 ...Banked memory running slower?I've just compiled a TAP which includes bank6, it loads ok, but the routines that are paged in run slightly slower. The Z80 snapshot has no such pro…
... do something like PRINT USR 32768, the register pair BC gets loaded ... it returns, the contents of BC is returned as the result ... put your counter result in BC, you can see the result ... , if you like, 'LET BC = USR 32768 : PRINT BC'.
Another trick ...Bored of the Rings coded messageI was browsing [url="https://tcrf.net/"]The Cutting Room Floor[/url] recently and stumbled upon the entry for [url="https://tcrf.net/Bored_of_the_Rin…
... ,MESSAGE
call $203c ;PR_STRING print BC characters from DE
call $203c ;PR_STRING print BC characters from DE
NOMATCH ...RANDOMIZE USR, PRINT USR etcHello just wondering why is it called RANDOMIZE UsR what does randomising have to do with it ? When calling machine code routine from adress x you ty…
... br /> - Puts nn in BC.
- Execute the machine ... of BC.
So, when you use PRINT ... will return safely (and print the number 65368). ... will print 65367 (you're executing a dec bc ... />
- PRINT USR nn will print BC on screen, ruining your ...Smooth Color Masked Sprites using fast page flip on 48kHere is a quick demo of using char based sprites using the Page flip method: a) Background is copied to buffer b) Sprites drawn on buffer c) Buffer …
... br /> ; make tasm understand other assembler instructions
#DEFINE DEFB .BYTE ... br /> PUSH AF
PUSH BC
PUSH HL
... />
; PCHAR
; PRINT A 1*8 CHAR TO ...Smooth Masked Sprites using fast page flip on 48k Part 2Ok, After all the suggestions in Part 1, which were all excellent (Thankyou), I opted on the following: I have 2 x 6k Offscreen areas (Yes, that's …
... br /> ; make tasm understand other assembler instructions
#DEFINE DEFB .BYTE ...
INC B
PUSH BC
CALL WRITECHAR
POP ... />
; PCHAR
; PRINT A 1*8 CHAR TO ...PRINT AT in assembler Hello everyone, I am very new to this forums. Like perhaps many others I had a Spectrum as a child and did pretty much simple BASIC programming, bu…
... (perhaps not) simple things like print a single character to the ... that to achive the BASIC PRINT AT-operation the instructions would ... ", but the X would only print this number of new lines ...Problem with SPIN assemblerCan anybody tell me why the following machine code program doesn't assemble in the SPIN assembler? ; my first machine code program ld bc, 5 ret Any…
... 't assemble in the SPIN assembler?
; my first machine ... code program
ld bc, 5
ret
assembler instructions I'd be grateful ...help sought with first foray into machine code - pixel scrolldownI have started to code my first machine code program, a simple roadrace game. I've based it around the pixel scrolldown routine in 40 Best Machine Co…
... is that the ZX Spin assembler tells me 'Warning. Symbol ... br /> ld (hl),a ;print road left side
...
ld (hl),a ;print left side on line1
print
ld (de),a ;??print a blank ... ready to print top line road left
pop bc ;recover ...New for 2009 - mc onelinersI found the limit of one line and one screen's worth of program really useful in (re-)learning BASIC, so I've decided to carry the format over into m…
... is the ZX Spin assembler source code:
... djnz fillscreen
ld bc,0 ;initialise score
... moveright
ld bc,32766 ;read keyboard space ... posn
xor a ;print new road
ld ... return score in BC
gameover
pop bc ;retrieve score ...BASin Assembler suggestionsHi Dunny. According to your former request here goes a few suggestions. Been playing around with the Assembler and I'm glad I did. Quite nice indeed…
... /> Been playing around with the Assembler and I'm glad I ... related note, why are the BC and DE labels bold?)[/LIST]Tutorial - learn machine code in 30mins[B][I]Message from the moderators[/I] - bigjon has requested that readers' attention be drawn to a better version of this tutorial, one which is easi…
... so, go to GAMEOVER.
;print car
;scroll road
When the Spin assembler gets to the instruction 'ret ... at GAMEOVER insert line21, 'push bc; save score'. Replace line ...
gameover
pop bc ;retrieve score
pop hl ...What Z80 development tools do you use? What books?Hi. I've been meaning to do it for over 25 years, but.. better late than never :) I'm starting to learn machine code and am trying to get a developme…
... days, Zeus Assembler, then moved onto the assembler in BASin ... /game/z80asm"]Z80 PC Assembler or z80asm[/URL] which ... /> ld bc,eostr-string ; length of string to print
... call 8252 ; print our string
Whi different result with Spectrum +3 ?The followed code 10 FOR n=23296 TO 23299 20 READ a: POKE n,a 30 NEXT n 40 DATA 1,127,106,201 50 PRINT USR 23296 causes that the spectrum 48k show…
... ,127,106,201
50 PRINT USR 23296
causes ... screen. Why ?
the assembler code of this c/m ... the follow.
LD BC,27263
RET
C/M Why different result with Spectrum +3 ?The followed code 10 FOR n=23296 TO 23299 20 READ a: POKE n,a 30 NEXT n 40 DATA 1,127,106,201 50 PRINT USR 23296 causes that the spectrum 48k show…
... ,127,106,201
50 PRINT USR 23296
causes ... screen. Why ?
the assembler code of this c/m ... the follow.
LD BC,27263
RET
Keys redefine routine and key check.I have written some asm code which allows me to redefine keys (for a game etc.), and also allows me to be able to check any keypresses for the redefi…
... compiles fine using the ZXSpin assembler, and should be relocatable, ... address back
call pm_do_it ; print the message
ret
; -----------------------------------------------
delay: ld bc,32768
ld a,0 ...Using the ROMs PRINT routineI really am starting from scratch again it seems, but how do you utilize the ROM routine to print characters, I think you point te BC register to an …
... routine to print characters, I think you point te BC register to ...What's wrong with this code ?OK, working my way through Jonathan Cauldwells 'How To' tome and I can't get the following to run in either spin or basin. ( iused the assembler in b…
... spin or basin. ( iused the assembler in both and i tried ... new coordinates.
ld bc,63486 ; keyboard row 1-5 ... />
; Show player at current print position.
splayr ld ...PRINT a numerical value i.e. the scoreHow do you fo about printing a numerical value using the print routine in the ROM? For instance I have a value 0-255 and want to PRINT the result at…
... a numerical value using the print routine in the ROM?
PRINT the result at say 0 ... , (address of text to print)
ld bc, (length of text to ... print)
call 8252
Ideas for speeding up this BASIC routine?This loop can take up to 2 minutes to run, depending upon the content of the screen being scanned, about 70% of that time being taken up by lines 105…
... (other than rewriting them in assembler)? Don't worry about the ...
