mirror of https://github.com/hsoft/collapseos.git
32 lines
1.3 KiB
Markdown
32 lines
1.3 KiB
Markdown
# Assembling z80 source from the shell
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In its current state, Collapse OS has all you need to assemble z80 source
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from within the shell. What you need is:
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* A mounted filesystem with `zasm` on it.
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* A block device to read from (can be a file from mounted CFS)
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* A block device to write to (can theoretically be a file, but technical
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limitations temporary prevents us that. We'll use a mmap for now).
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The emulated shell is already set up with all you need. If you want to run that
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on a real machine, you'll have to make sure to provide these requirements.
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The emulated shell has a `hello.asm` file in its mounted filesystem that is
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ready to compile. It has two file handles 0 and 1, mapped to blk IDs 1 and 2.
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We only use file handle 0 (blk ID 1) and then tell zasm to output to mmap which
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is configured to start at `0xe00`
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Collapse OS
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> fopn 0 hello.asm ; open file in handle 0
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> zasm 1 3 ; assemble opened file and spit result in mmap
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> bsel 3 ; select mmap
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> peek 5
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210890CD3C ; looking good
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> mptr 4200 ; hello.asm is configured to run from 0x4200
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> load ff ; load compiled code from mmap
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> peek 5
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210890CD3C ; looking good
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> call 00 0000
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Assembled from the shell
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> ; Awesome!
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