Z80 gets a new OS

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George Farris

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Nov 16, 2022, 11:38:56 PM11/16/22
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This is an interesting project, fully open source.

https://hackaday.com/2022/11/08/z80-gets-new-os/


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George - VE7FRG

Les Bird

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Nov 17, 2022, 10:02:14 AM11/17/22
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I love that the OS is all in ROM. Super cool. I’m going to explode this. Thanks for posting Georgia.

Les

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Douglas Miller

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Nov 17, 2022, 10:05:52 AM11/17/22
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I was also planning to try and run it on my simulator. I'm not really keen on the memory map (48K program space max, with some of it being sub-optimal (paged during syscalls)), but it does seem that it would work with the H8-512K board. Of course, no apps for it.

Mark Garlanger

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Nov 17, 2022, 1:14:04 PM11/17/22
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On the subject of OSes, since we have the HDOS source, I would love to start with the latest 3.0 source and add on to it. Some of the things I was thinking about: making it Y2K compliant, since the date field actually has an extra bit, so it could represent dates up to 2097. 
Screen Shot 2022-11-17 at 12.07.18 PM.png
Add support for subdirectories, since the actual directory is a file, it should make it easier to support subdirectories. 
I was thinking of only adding things that would have been possible back in the day on standard Heath systems.

Mark

glenn.f...@gmail.com

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Nov 17, 2022, 2:09:11 PM11/17/22
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I was always a little frustrated at the solution we evolved to for Y2K on HDOS.  As you mentioned, core HDOS is Y2K compliant – it’s just SYSCMD (and PIP) that didn’t bother to handle date i/o properly (CAD.ACM and DAD.ACM in the source code). All credit to Stan Webb for his patch that augments the date by 70 years but it is a kludge that breaks old date handling.

 

Subdirectories make sense but the trick will be to not bloat the OS.  HDOS 3 did a nice job of adding useful stuff but keeping the memory footprint manageable.

 

From: se...@googlegroups.com <se...@googlegroups.com> On Behalf Of Mark Garlanger
Sent: Thursday, November 17, 2022 1:14 PM
To: se...@googlegroups.com
Subject: Re: [sebhc] Z80 gets a new OS

 

On the subject of OSes, since we have the HDOS source, I would love to start with the latest 3.0 source and add on to it. Some of the things I was thinking about: making it Y2K compliant, since the date field actually has an extra bit, so it could represent dates up to 2097. 

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