Simple programa to print a char on the screen

[rcmolina]

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Hi,

Need some help for  assembler code to print a character on the screen using the built-in assembler on the emulator.

_

Rafa

 

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[CDesp]

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Hi,

Org 6000h

WPTCHAR EQU $3CDF

ld a,’A’
DEFW WPTCHAR
ret

 

this uses the newbrain OS to print a char on the screen

if you want to print at a specified location use this

Org 6000h

WPTCHAR EQU $3CDF

ld a,22
DEFW WPTCHAR
ld a,10    ;X = Column
DEFW WPTCHAR
ld a,15   ; Y= Row
DEFW WPTCHAR

ld a,’A’
DEFW WPTCHAR
ret

Usefull screen codes

22,x,y

31 ;Clear screen

 

For built in assembler write the code to source. Click Compile then next to this button the RAM button will put the object code to ram. Next call 24576 to run.

if you click put object in file then a file names <youfilename>.txt will be created that will have the basic code to run the code like this

10 Reserve top-24576
20 For i=0 to 16
30 Read a:poke 24576+i,a
40 next i
50 ?”type CALL TOP to run your code.”
100 END
10000 DATA 62,22,223,60,62,10,223,60,62,15

also a <filename>.blst like this

5) 6000 3E 16 ld a,22 ;
6) 6002 DF 3C DEFW WPTCHAR ;
7) 6004 3E 0A ld a,10 ;
8) 6006 DF 3C DEFW WPTCHAR ;
9) 6008 3E 0F ld a,15 ;
10) 600A DF 3C DEFW WPTCHAR ;
12) 600C 3E 41 ld a,’A’ ;
13) 600E DF 3C DEFW WPTCHAR ;
14) 6010 C9 ret ;

and ofcourse the <filename>.bin that have the raw bytes.

The <filename>.GSYM contains the global symbols if you declared any, so you can include it to another source file if you want.

you can declare globals at the start of the source file usually for projects

GLOBAL <name>

GLOBAL test

test equ 45 or

test: xor a

ret

OR

@test equ 45

@test: xor a

 

 

• This reply was modified 8 hours, 24 minutes ago by CDesp.
• This reply was modified 8 hours, 23 minutes ago by CDesp.

[rcmolina]

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Hi CDesp,

Many thanks for your complete answer 😉

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Rafa

[Author]

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