Microbee Assembler - Hello World

snake · 25-09-2021, 08:08 PM

Does anyone have assembly code for a Hello World program that will run on a Microbee?

someone · 25-09-2021, 10:16 PM

(25-09-2021, 08:08 PM)snake Wrote: Does anyone have assembly code for a Hello World program that will run on a Microbee?

Somebody does!
The constants and prefixes may vary according to the assembler you're using.
e.g. The # - indicates an immediate value & the % indicates a hexadecimal number

Code:
VDU  EQU  %F000

START:

   LD   HL,#CMSG_HELLO

   LD   DE,#VDU

   LD   BC,#CMSGENDED_HELLO - CMSG_HELLO

   LDIR

   RET

CMSG_HELLO:

   DB   "Hello, World"

CMSGENDED_HELLO:

snake · (This post was last modified: 26-09-2021, 12:51 AM by snake.)

Awesome!

Thanks.

I have z80asm running on a Mac using Sublime text, it's successfully compiling code for the Microbee.

Filename: Screen Shot 2021-09-25 at 11.47.29 pm.png Size: 178.93 KB 26-09-2021, 12:50 AM

This works.

What is the Microbee convention? .asm or .z80 ?

snake · 26-09-2021, 01:53 AM

zasm is also working under MacOS using Sublime Text
https://k1.spdns.de/Develop/Projects/zas...ributions/

someone · 26-09-2021, 03:00 PM

(26-09-2021, 12:35 AM)snake Wrote: ... What is the Microbee convention? .asm or .z80 ?

Whatever you want depending upon the toolchain you're using.
Back then we were limited by disk operating systems that only supported 8.3 filenames in the root directory.

snake · 05-10-2021, 12:20 PM

VDU: EQU $F200
START:
LD HL,CMSG_HELLO
LD DE,VDU
LD BC,CMSGENDED_HELLO - CMSG_HELLO
LDIR
RET

CMSG_HELLO:
db 'Hello World'
CMSGENDED_HELLO:

This code is giving me boxes on the screen instead of the characters, any suggestions?

***ChickenMan*** · 06-10-2021, 07:21 PM

(05-10-2021, 12:20 PM)snake Wrote: VDU: EQU $F200

This line should read

VDU: EQU $F000

Ernest · 07-10-2021, 01:56 AM

The $F200 is only the place on the screen that the output will start from.
I'm assuming that snake wants to start further down the screen than the top left corner $F000.

My concern is, where is the assembler getting the start address for the program itself to reside at, I don't see an origin address.
For auto running under Basic it would need to be $0900 from memory.
Without an origin the compiler my default to $0000 which is no good for the Microbee Basic.

But I will stand corrected here as
A) I am not familiar with the assembler / compiler that snake is using.
B) I'm super rusty when it comes to machine level programming.

Ernest

snake · 07-10-2021, 02:59 AM

Correct!

I was using ORG 400H and it needed to be ORG 900H because it was loading from basic.

Thanks to -

Quote:
Quote:Ewan J. Wordsworth
Microbee Technology Pty Ltd