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RE: [N8VEM-S100:580] S-100 8086 Up and Runing
Hi! Merry Christmas and Happy New Year to you!
I think CP/M-80 on the S-100 8086 CPU board is at least theoretically possible.
CP/M-80 is purely 8080 instructions and I think the V30 supports 8080 only 8-bit mode also -- it doesn't support Z80 unique instructions AFAIK.
I think John wrote a CBIOS for the S-100 Z80 CPU board so that would be a good starting point since it would use other of the boards we've built.
However, you'd need to translate the Z80 instructions in John's CBIOS to pure 8080 instructions since I think John used Z80 operations.
This would be a good project for some of the other builders who would like to get involved.
I think John is pretty busy these days with other boards we are working on so this would get done a lot sooner if someone else volunteers.
Thanks and have a nice day!
From: n8vem...@googlegroups.com [mailto:n8vem...@googlegroups.com] On Behalf Of Robert
Sent: Monday, December 26, 2011 12:20 PM
Subject: Re: [N8VEM-S100:580] S-100 8086 Up and Runing
Good for you!!! Wow! Congratulations!
I've read that the V30 chip can be made to run in an 8-bit mode (I think, via assembly commands). I wonder if you could run CP/M on a V30 (in 8-bit mode)?
>From: Elsid <le...@swiftdsl.com.au>
>Sent: Dec 26, 2011 4:43 AM
>To: N8VEM-S100 <n8vem...@googlegroups.com>
>Subject: [N8VEM-S100:575] S-100 8086 Up and Runing
>Hi and Seasons Greatings.
>All the best to everyone and their families.
>I've just completed my S-100 8086 board.
>See photos at:
>Everything went smoothly except a missing K8 jumper 1-2 gave me some
>grief for a while.
>I have a V30 CPU and a 24MHz oscillator (8MHz clock) without any
>problems. I'll try 10MHz next when I get a crystal.
>Next step is to get CPM86 and MSDOS going.
>Thanks for another great board John and Andrew.