mirror of https://github.com/hsoft/collapseos.git
39 lines
1.5 KiB
Markdown
39 lines
1.5 KiB
Markdown
# emul
|
|
|
|
This is an emulator for a virtual machine that is suitable for running Collapse
|
|
OS. The goal of this machine is not to emulate real hardware, but rather to
|
|
serve as a development platform. What we do here is we emulate the z80 part,
|
|
the 64K memory space and then hook some fake I/Os to stdin, stdout and a small
|
|
storage device that is suitable for Collapse OS's filesystem to run on.
|
|
|
|
Through that, it becomes easier to develop userspace applications for Collapse
|
|
OS.
|
|
|
|
We don't try to emulate real hardware to ease the development of device drivers
|
|
because so far, I don't see the advantage of emulation versus running code on
|
|
the real thing.
|
|
|
|
## Bootstrapped binary
|
|
|
|
The file `zasm/zasm.bin` is a compiled binary for `apps/zasm/glue.asm`. It is
|
|
used to bootstrap the assembling process so that no assembler other than zasm
|
|
is required to build Collapse OS.
|
|
|
|
This binary is fed to libz80 to produce the `zasm/zasm` "modern" binary and
|
|
once you have that, you can recreate `zasm/zasm.bin`.
|
|
|
|
This is why it's included as a binary in the repo, but yes, it's redundant with
|
|
the source code.
|
|
|
|
## Usage
|
|
|
|
First, make sure that the `libz80` git submodule is checked out. If not, run
|
|
`git submodule init && git submodule update`.
|
|
|
|
The Makefile in this folder has multiple targets that all use libz80 as its
|
|
core. For example, `make shell` will build `./shell`, a vanilla Collapse OS
|
|
shell. `make zasm` will build a `./zasm` executable, and so on.
|
|
|
|
See documentation is corresponding source files for usage documentation of
|
|
each target.
|