Really nice find Les. Have fun!
From: se...@googlegroups.com <se...@googlegroups.com> On Behalf Of Les Bird
Sent: Wednesday, June 09, 2021 5:53 PM
To: SEBHC <se...@googlegroups.com>
Subject: [sebhc] Not Heathkit related: Zilog PDS8000/MCZ hardware
Greetings all,
Z8000 dev board
On Jun 9, 2021, at 11:04 PM, 'George Farris' via SEBHC <se...@googlegroups.com> wrote:
Nice score Les,I recall one of these at the place I worked, never layed my hands on it but it does look very familiar.GeorgeOn Wed, 2021-06-09 at 14:53 -0700, Les Bird wrote:
Greetings all,I've recently acquired 2 Zilog dev systems from an eBay purchase. These are heavy machines equipped with 2 8-inch floppy drives. The software that came with it looks to be in really good shape, 32 hard sector format (128 bytes per sector). My first task will be, if they work, to image the disks by adapting Dwight Elvey's H89LDR. Should be a fun project.My very first programming job out of high school was on these very same machines so for me there's some nostalgia here. I also have disks for these machines from when I used to program them so hopefully I can image those as well, although they are not in the best of shape (some are bent).The operating system is called RIO but with some mods these machines can also run CP/M but I'm not really interested in doing that.One of the machines included a Z8000 4Mhz dev board with onboard RAM (I think 256K) but in the default configuration the machines come with a Z80 CPU board at 2.5Mhz.The interface is via RS232 terminal to a card with 4 8251 serial chips.The buss is NOT S100, it is a custom buss designed by Zilog specifically for these systems.
<IMG_6098.JPG>Z8000 dev board
<IMG_6091.jpg>--
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Hello Les,
Found my spare H89-H37 controller which I will sell to you to help out. As this board is using the originals PALS from the Heathkit board, so the cost will be just the Controller and the OSC + Shipping.
See attached picture and will send out Paypal invoice.
Thanks,
Norberto
From: "se...@googlegroups.com" <se...@googlegroups.com> on behalf of Les Bird <les...@bellsouth.net>
Reply-To: "se...@googlegroups.com" <se...@googlegroups.com>
Date: Saturday, June 12, 2021 at 10:00 AM
To: "se...@googlegroups.com" <se...@googlegroups.com>
Subject: Re: [sebhc] Not Heathkit related: Zilog PDS8000/MCZ hardware
Norby, that is a beautiful Z89-37 card design. Do you have any of these assembled to sell?
Also, after lots of debugging and mixing/matching boards/drives from both machines I finally got one system working and booting to the RIO OS. Video link below in case anyone wants to see these old machines boot.
Les
On Thursday, June 10, 2021 at 3:24:21 PM UTC-4 Norby wrote:
The 8" floppy drives will work with the H89-Z37 that I build and Gotek drives should work as well. This is true only if everything is wired properly when using other controllers.
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The DREM device says it supports 8” floppy emulation. Steven Hirsch has spoken very highly of this outfit. They shut down shipment over the winter but now have a new design and appear to be shipping. On the pricey side for the hobbyist but you get what you pay for I guess…
Of course back in ’79 we thought $300 was a decent price for an H17 (100K) drive! that’s $1,182 in today’s $ 😊
From: se...@googlegroups.com <se...@googlegroups.com> On Behalf Of Les Bird
Sent: Thursday, June 10, 2021 2:09 PM
To: SEBHC <se...@googlegroups.com>
Subject: Re: [sebhc] Not Heathkit related: Zilog PDS8000/MCZ hardware
Glenn, not sure if a solid state solution is available.
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Great work les. Even though not Heath I’m enjoying hearing about how you’re applying some of the techniques we’ve used on this new (to you) machine…
From: se...@googlegroups.com <se...@googlegroups.com> On Behalf Of Les Bird
Sent: Saturday, July 03, 2021 4:04 PM
To: SEBHC <se...@googlegroups.com>
Subject: Re: [sebhc] Not Heathkit related: Zilog PDS8000/MCZ hardware
Santo,
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