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fluxengine/doc/disk-zilogmcz.md
2025-08-20 21:23:02 +02:00

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zilogmcz
====
## 320kB 8" 77-track SSSD hard-sectored
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The Zilog MCZ is an extremely early Z80 development system, produced by
Zilog, which came out in 1976. It used twin 8-inch hard sectored floppy
drives; here's one at the <a
href="http://www.computinghistory.org.uk/det/12157/Zilog-Z-80-Microcomputer-System/">Centre
for Computing History</a>:
<div style="text-align: center">
<a href="http://www.computinghistory.org.uk/det/12157/Zilog-Z-80-Microcomputer-System/">
<img src="zilogmcz.jpg" style="max-width: 60%" alt="A Zilog MCZ at the Centre For Computing History"></a>
</div>
The MCZ ran Zilog's own operating system, Z80-RIO, and used 77 track
single-sided disks, with 32 sectors (each marked by an index hole), with 132
bytes per sector --- 128 bytes of user payload plus two two-byte metadata
words used to construct linked lists of sectors for storing files. These
stored 320kB each.
FluxEngine has read support for these, including support for RIO's ZDOS file
system.
## Options
(no options)
## Examples
To read:
- `fluxengine read -c zilogmcz -s drive:0 -o zilogmcz.img`
## References
* [About the Zilog MCZ](http://www.retrotechnology.com/restore/zilog.html),
containing lots of useful links
* [The hardware user's manual](https://amaus.org/static/S100/zilog/ZDS/Zilog%20ZDS%201-25%20Hardware%20Users%20Manual.pdf)