collapseos/doc/zasm.md

Assembling z80 source from the shell

In its current state, Collapse OS has all you need to assemble z80 source from within the shell. What you need is:

• A mounted filesystem with zasm on it.
• A block device to read from (can be a file from mounted CFS)
• A block device to write to (can also be a file).

The emulated shell is already set up with all you need. If you want to run that on a real machine, you'll have to make sure to provide these requirements.

The emulated shell has a hello.asm file in its mounted filesystem that is ready to compile. It has two file handles 0 and 1, mapped to blk IDs 1 and 2. We will open our source file in handle 0 and our dest file in handle 1. Then, with the power of the fs module's autoloader, we'll load our newly compiled file and execute it!

Collapse OS
> fnew 1 dest           ; create destination file
> fopen 0 hello.asm     ; open source file in handle 0
> fopen 1 dest          ; open dest binary in handle 1
> zasm 1 2              ; assemble source file into binary file
> dest                  ; call newly compiled file
Assembled from the shell
>                       ; Awesome!