ZX Interface 1

<h2 id="network">Network</h2>

<p>The device offered two network ports, allowing up to 64 ZX Spectrums to be <a href="/facts/Network_topology/rBYE0kke">daisy-chained</a> using network leads up to 3 metres (10 ft) long. The network, called ZX Net, used a bidirectional wire with a proprietary <a href="/facts/Carrier_Sense_Multiple_Access/uUMMF4ex">CSMA</a>-like protocol. Data could be sent or received at 100 kbit/s either to or from a numbered workstation, or broadcast to all nodes, allowing one machine to act as a server.
</p><p>Station number 0 is used to indicate broadcast. Data is transmitted in packets, each a maximum of 255 bytes long; the packet and the header are protected by a checksum. Character transmission uses 1 start bit, 8 data bits and 1 stop bit (the common 8-N-1 configuration).
</p><p>Main commands:<a class="footnote-ref" id="fnref:2" href="#fn:2"><sup>2</sup></a>
</p>
FORMAT "n";<station number>
SAVE * "n";<station number>
LOAD * "n";<station number>
<p>Select for example 1 as the address of the first computer (station number):<a class="footnote-ref" id="fnref:3" href="#fn:3"><sup>3</sup></a>
</p>
FORMAT "n";1
SAVE * "n";2
<p>Select 2 for the second computer address:<a class="footnote-ref" id="fnref:4" href="#fn:4"><sup>4</sup></a>
</p>
FORMAT "n";2
LOAD * "n";1
<p>Which will then transfer the program from "1" to "2".
</p><p>Other commands:<a class="footnote-ref" id="fnref:5" href="#fn:5"><sup>5</sup></a>
</p>
CAT # Lists the file and directory contents of unit #
LOAD * "m";1;"name" # Loads the program "name" from "microdrive" unit 1
<h2 id="see-also">See also</h2>
<ul><li><a href="/facts/ZX_Interface_2/9l8RVjgf">ZX Interface 2</a> – an interface providing joystick and ROM cartridge ports</li>
<li><a href="/facts/ZX8302/HA7snD25">ZX8302</a> – ULA integrated circuit designed for the Sinclair QL</li></ul>

<h2 id="external-links">External links</h2>
<ul><li><a href="http://www.nvg.ntnu.no/sinclair/computers/peripherals/interface1.htm">ntnu.no - Information at Planet Sinclair</a></li>
<li><a href="http://www.worldofspectrum.net/hardware/feat7.html">worldofspectrum.org - Hardware feature from Sinclair User - October 1983</a></li>
<li><a href="http://www.dataserve-retro.co.uk/contents/en-uk/d6.html">dataserve-retro.co.uk - Sinclair Interface 1 & Microdrive</a> <a href="http://www.dataserve-retro.co.uk/contents/media/Interface%201%20scan%20Small.jpg">*</a>
<ul><li><a href="https://github.com/ZXSpectrumVault/rom-disassemblies/blob/master/Spectrum%2048K/Sinclair-Interface-1.asm">- disassembly version 1</a></li>
<li><a href="https://github.com/ZXSpectrumVault/rom-disassemblies/blob/master/Spectrum%2048K/Sinclair-Interface-1-v2.asm">- disassembly version 1.2</a></li></ul></li>
<li><a href="https://web.archive.org/web/20090423123124/http://www.dilwyn.me.uk/pe/index.html#tk2">dilwyn.me.uk - Toolkit 2</a>[<i>usurped</i>]</li>
<li><a href="http://www.sinclair.hu/speccyalista/konyvtar/kezikonyvek/ZXInterface1-2_Microdrive_ServiceManual.pdf">www.sinclair.hu - ZX Interface 1/2/Microdrive Service Manual 1985</a></li>
<li><a href="http://www.sinclair.hu/speccyalista/konyvtar/kezikonyvek/ZXInterface1_Microdrive_Manual.pdf">www.sinclair.hu -  ZX Interface 1/Microdrive Manual 1983</a></li></ul>

<h2 id="references">References</h2>

<ol>
<li id="fn:1"><p>Interface 1, Issue 10, December 1984, Your Spectrum 10 <a href="http://www.users.globalnet.co.uk/~jg27paw4/yr10/yr10_26.htm" target="_blank">http://www.users.globalnet.co.uk/~jg27paw4/yr10/yr10_26.htm</a> <a href="#fnref:1" class="footnote-back-ref">↩</a></p></li>
<li id="fn:2"><p>worldofspectrum.org - Microdrive and Interface 1 manual, 1983, file date <a href="ftp://ftp.worldofspectrum.org/pub/sinclair/books/MicrodriveAndInterface1Manual.pdf" target="_blank">ftp://ftp.worldofspectrum.org/pub/sinclair/books/MicrodriveAndInterface1Manual.pdf</a> <a href="#fnref:2" class="footnote-back-ref">↩</a></p></li>
<li id="fn:3"><p>worldofspectrum.org - Microdrive and Interface 1 manual, 1983, file date <a href="ftp://ftp.worldofspectrum.org/pub/sinclair/books/MicrodriveAndInterface1Manual.pdf" target="_blank">ftp://ftp.worldofspectrum.org/pub/sinclair/books/MicrodriveAndInterface1Manual.pdf</a> <a href="#fnref:3" class="footnote-back-ref">↩</a></p></li>
<li id="fn:4"><p>worldofspectrum.org - Microdrive and Interface 1 manual, 1983, file date <a href="ftp://ftp.worldofspectrum.org/pub/sinclair/books/MicrodriveAndInterface1Manual.pdf" target="_blank">ftp://ftp.worldofspectrum.org/pub/sinclair/books/MicrodriveAndInterface1Manual.pdf</a> <a href="#fnref:4" class="footnote-back-ref">↩</a></p></li>
<li id="fn:5"><p>worldofspectrum.org - Microdrive and Interface 1 manual, 1983, file date <a href="ftp://ftp.worldofspectrum.org/pub/sinclair/books/MicrodriveAndInterface1Manual.pdf" target="_blank">ftp://ftp.worldofspectrum.org/pub/sinclair/books/MicrodriveAndInterface1Manual.pdf</a> <a href="#fnref:5" class="footnote-back-ref">↩</a></p></li>
</ol>

ZX Interface 1 open-in-new

ZX Interface 1