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Recipes contain bits and pieces of hardware-related knowledge, but these bits feel sparse. I've been wanting to consolidate hardware- related documentation for a while, but always fell at odds with the recipes organisation. We don't have recipes anymore, just a /doc/hw section that contains hardware-related documentation which often translate to precise instructions to run Collapse OS on a specific machine. With this new organisation, I hope to end up with a better, more solid documentation.
23 lines
812 B
Plaintext
23 lines
812 B
Plaintext
# Using Zilog's SIO as a console
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The RC2014 has an optional module called the Dual Serial Module
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SIO/2 which is built around Zilog's SIO chip. This module is
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nice because when paired with the Dual Clock Module and when
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using port B, it's possible to run a UART with a baud rate lower
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than 115200.
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Collapse OS has a driver for it (although for now, only port A
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is supported by it). Let's use it.
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* Let's assume a xcomp unit similar to the one in
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/arch/z80/rc2014.
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* Locate SIO driver in /arch/z80/rc2014/blk
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* The driver main page gives you references for declarations and
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for code.
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* In the base xcomp unit, replace ACIA declarations with SIO's
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* Replace ACIA code with SIO's
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* At the bottom, replace "ACIA$" with "SIO$".
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Rebuild the binary and you're done. "(key)" and "(emit)" will
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go through the SIO.
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