![[Zenith Z110 system]](z100x.jpg)
This Web page last updated Sept 26 2011.
This Web page is PRIMARILY about the Z-110 and Z-120 S-100 Heathkit or Heath - Zenith computers built and sold in the 1980's. But I also have information and manuals for other computer products from Heathkit, on this or other Web pages. There is not much here about later Zenith computers that run only MS-DOS or Windows: try a Web search to find more information on those. Details and links are below.
Details on the Z-100 system and its history are on another page.
21st century "Heath/Zenith" brand products via this link.
For my S-100 Home page follow this link.
Ordering information and how to email @ me can be found in this notice.
Here's additional pages on specific Heath subjects:
Ordering information and how to email @ me can be found in this notice.
![[Zenith Z120 system]](z100hp.jpg)
This Web page has some info about and items for HeathKit and Heath. That includes the Heath / Zenith Z-100 S-100 based computers.
The Z-110 model pictured on the left is generally called the
low profile model, without an internal CRT monitor; the
Z-120 or "all-in-one" model shown on the right
had a internal monochrome CRT monitor (which many updated to color). These models have
a six-slot S-100 backplane on their 8085 and 8088 CPU motherboard. (Zenith sold later models
in the Z-100 series which were much like IBM PC's; I don't "cover" those models.)
We are always looking for selected Z-110 and Z-120 items at very modest prices, for other people interested in these systems. If you wish to offer something, please provide your city/state/zip, tell me what you have, if you will ship, what you want for it, and when you must "move" it. But over the last few years, I usually get "I have a bunch of stuff, I have to move it, can you help?" and I have to ask these same questions again - so save us both some time. But if you are a thousand miles away and only have a week, there's not much I can do. Maybe I can refer you to someone else, that's about it.
I don't pay much, because I have plenty, and they don't sell for much. I may want selected parts, even if you have to discard the rest and can't ship, so ask me accordingly. Thank you. I have had requests from "new" Z-100 owners for operating information and
"boot disks" or operating systems. Consequently I've put together this
Z-100 systems disk package: several disks and photocopied manual exerpts. This includes the following ten 5.25-inch 360K diskettes: 10 diskettes, 100 pages of manual extracts - $49 plus shipping
The manuals exerpts are from: In 2010 I've tested a few "low profile" Z-100 systems I can sell.
These have either 768K of memory or 192K of memory, a floppy controller,
and 32K or 64K of video memory. In general these will be tested and working
when shipped. They WILL, repeat WILL, require mechanical work on cases and front
plates. They will NOT have floppy drives except at some extra cost.
This is not a mint system offered on a silver platter. What you are getting is a functional Z-100 that you can work on. Minimum shipping weight is about 50 lbs. We will not ship the "all in one" systems with internal CRT monitor, they are too heavy and too easily damaged.
Ask about price with shipping - but anything below $100 each plus shipping will be very hard
for me to accept, for the effort and fuss it takes, for the value of the parts, etc. We'll consider selling the motherboards only as
tested and working; price will be at least $59, and based on whether they are 192K or 768K, more for more memory. We'll sell other parts too if we can.
Other Heath Zenith Z-100 cards: prices do not include shipping or additional testing, ask about testing costs. These boards were tested several years ago unless noted otherwise. Winchester (hard disk drive) card sets are sometimes available. If
you have a set I'd be interested in them. .
Zenith Z207-41 8-inch floppy drive enclosures and 8-inch drives are mentioned in the
drives section of my WEb page. The 30 page manual is available
as a copy from me, ask for details.
The Z-100 series had two models of power supplies. Zenith docs list some of them as follows, but Zenith
has many other part numbers for these power supplies. ALso, the "Winchester drive" model has a P6 connector for the drive controller.
Low profile model- 234-200 I have a few of these pulled from working systems. I think the low profle model with P6 connector is rectangular shaped and has the Zenith number ZDS-234-432. The "all in one" model with the CRT had a power supply shaped like a small box with a wedge-shaped top, number ZDS-234-433. I'd sell a good used one for $49 plus shipping, shipping weight 10 lbs. Let me know if you must have the P6 connector for a Zenith Winchester controller.
Manuals for hardware are listed with the Heath manual sets Web page.
I'm very fond of these systems, I used these some years ago and worked with a developer
and manufacturer of H89 cards. I have a few of these systems, but haven't had time
in the past to do much with them. But in a weekend in 2009, I did some repairs to a few H-89 systems.
Thanks to the generousity of a Boston area H-8 owner, I acquired an H-8 in 2005. Follow this link for details, and manuals I have available. Also check the SEBHC group in my "sites" section they support old and new versions of the H8.
Heathkit EUW-19A (see image) Operational Amplifier System. Malmstadt-Enke type, from the Malmstadt & Enke's book "Electronics for Scientists" which describes this EUW series of Heath products. I have more information on my analog computers Web page.
These are Zenith's early PC compatible systems. Please don't ask me if I want or will buy these systems, they just are not of great interest to me. I only have a few manuals, the manuals are for sale as listed below.
Here's some interesting Heath and Zenith computing Web sites on the H8, H89 and H-110 and H-120 models.
Les Bird of the Society of Eight-Bit Heathkit Computerists (SEBHC) archive site alerted me to that organization and its Web archive.
There is also a SEBHC Google group.He said: "In addition to many disk images and ROM dumps available on my website I also have several newly designed PCBs for the H8 computer that I offer to those who are interested." The Google group dates from late 2007 andis modestly active. SEBHC was founded by Jack Rubin sometime in the early 2000s.
Les told me: "I have several H-8 computers and H89 computers and a website that is, for now, the home of the SEBHC archive. In addition to many disk images and ROM dumps available on my website I also have several newly designed PCBs for the H8 computer that I offer to those who are interested." The boards are priced near cost plus shipping. The Google group dates from late 2007 and (for a old computer discussion group) is modestly active." I obtained an H8 board set from Les in June 2009. Many thanks! Here's an image of Les Bird's Z80 H8 cpu board, with his ROM.
Mark Garlanger's Heathkit site has images of Heath's REMark and HUG magazines, and lots of references to Heath's 8-bit computers (H8 and H89). He's working on an emulator. I have some Heath related magazines for sale.
An Italian Web site with a Z-120 All-in-one
and some other computers of the era. Beautiful photographs!
Steven Vagts, the long time
editor of Z-100 Lifeline, a newsletter about the Z-100 and related Heath and Zenith
products. He also has some business in Z-100 products. His
LifeLines Web page,
The Heathkit H8 and H19 is described and EMULATED on Dave Wallace's Web site. He has
an emulation project which is current to mid-2003 but apparently not all features
works under Win 95/98. Although my site is S-100,
there is a stong lineage from the H8 to the H89 to the H/Z-100, the last of which
IS S-100. And I like the old Heath's anyway. So encourage Dave with his work and
maybe to move "up" to the H89 or Z-100 with his emulation!
This HeathKit company page by William A. Wilkinson has been around for several years but is still current. He has many links to Heathkit Web sites and has stories about
the Heath company.
Z-100 owner Lucien Stevens has imaged a bunch of Z-100 diskettes. Check his site to get the images to make Z-100 compatible diskettes. Another Z-100 program archive, previously from Simtel, is this private copy of INFO-Z100 on scovetta.com.
Additional sites: Bill Wilkinson's Heath Company Page Check my list of S-100 Web sites for other Web pages about S-100 computers and
CP/M, closely related to use of Heath's 8-bit systems.
Note: you may have found this Web page while looking for information
on Heath/Zenith products purchased in year 2002 or later. You should
know that the original "Heath", the old computer and hobby electronic kit company
(which is featured on this Web site) from Benton Harbor MI was liquidated in the mid 1990's. The
"Heath/Zenith" trade mark and name was sold seperately.
One apparently licensed user of the "Heath/Zenith" name markets various
home electronic products. It happens I got something from "Heath/Zenith" in 2002 at Home Depot (a USA national hardware superstore).
The bottom of its packing box says "DESA International, Bowling Green KY 42102,
Manufactured in China". A Web page at http://www.desaint.com/
refers to several product lines including "Heath/Zenith".
In 2008 I was alerted that Duchossois Industries includes the Heath/Zenith name and may have registered "heath-zenith.com". Their site says one of their "portfolio companies" is "heath-zenith" which links to the DESA Customer Care center. Check their sites for more information. If you want more info about
RECENT Heath Zenith home products, I suggest you check that site, or
read the lables on the box, or contact the store you bought your product from. One of these may refer you to the manufacturer;
or the store may have additional info on the product or the manufacturer. I have
no information on products from Desa International.
Another apparent licenser of the "Heath" name is Heathkit Company Inc.
or Heathkit Educational System, of Benton Harbor MI. All I know about this
company is from the information listed on their Web site at
heathkit.com. Their home page says "preparing
people for success in technology for over 75 years." This company appears to
provide educational trainers and training support for formal learning about
electronics of various sorts. They apparently support some of the old Heath Educational
materials and training manuals. They have links on their "support" Web page
to Desa International (mentioned above), and a link for old
Heathkit manual photocopies. (They no longer reference Hero support.)
The heathkit.com Web link for manuals as of 2009 is the "Professionals Heathkit Page" of Don Peterson.
Don has a small business of providing copies of manuals, and some odd parts and a "boneyard" of machines. He was a design engineer for Heathkit in the mid-1970's. Their Web page claims:
"Data Professionals of Pleasanton California has purchased the Copyrights and existing inventory of all legacy Heathkit product documentation from Heath Company of Benton Harbor Michigan for an undisclosed amount." Some discussion of this purchase and debate over what is covered, is on this Amateur Radio discussion forum. The title of the post is "DataPro purchases Heath Legacy Manual Service". Apparently the purchase was completed on OCtober 30 2008; apparently there is some contention over whether a copyright was transferred in the purchase, and the role of the US Copyright Office in that regard.
There are two other sites who use the Heath name with permission. Robert Doerr bought the Heath "Hero" robot name
and all the leftover parts, and offers support and info
via his Web site.
And, the Heathkit virtual museum is referenced on the Heathkit site,
at http://www.heathkit-museum.com/.
That site said they had permission to use the Heathkit name and links back to
"heathkit.com."
Electronic Design magazine's Web site has
an article by Louis E. Frenzel for Feb 2009 titled "Whatever Happened to Heathkit?". It's a good read but lacks some of the
updated information on this page as to where the "Heath" name has been sold or used recently.
If you have any corrections
to the above information I'd appreciate hearing
them: please include appropriate references so I can confirm that info. I am not
responsible for errors or omissions in the above info, use it at your own risk.
Herb Johnson
Copyright © 2011 Herb JohnsonH-100 systems wanted, for sale - PLEASE READ BELOW BEFORE YOU CONTACT ME
Z-100 systems software disk manual package
...and about 100 pages of exerpts from Zenith manuals.
Z-100 Hardware: parts and systems for sale
![[Zenith Z100 buscard]](z100bdx.jpg)
Z-100 motherboards 85-2653-1, 192K RAM-type, AS-IS FOR PARTS condition
Z-100 motherboards 85-2806-1, 768K RAM-type, AS-IS FOR PARTS condition
Some worked, some did not, some may be modified. Prices will depend on condition and completeness.
Minimum price for untested, reasonably complete no RAM no CPUs is $29 plus extra packing costs and shipping.
No returns on any of these motherboards, you are getting them for parts and for repair.
Heath/Zenith model 256K DRAM cards, 85-2898-1, labled 181-3917. 64K DRAMS 200ns, $49. with manual.
Macrotech 256K memory cards, Z-100 tested, $49.
Zenith floppy disk controller card, Z-100 tested, $59.
Zenith video card (mounts on motherboard), Z-100 testedm $39, w/64K or 32K RAM.
Zenith 4-port serial cards, with at least one serial cables, manual: untested. $49 plus shipping.
Low profile model with Winchester drive- 234-257
All-in-one model- 234-201
All-in-one model with Winchester drive- 234-256
Other Heath computing systems
H-89 systems, docs
box of Heath/Zenith H89 manuals
-------------------------------
These are in black binders by Zenith. Mold on binders but pages OK.
Wordstar 2.2X, revised 1/81 595-2681-01 no disks
CP/M 80 Basic Compiler binder with manuals, no disks:
Basic-80 595-2538-04
Basic compiler 595-2852-01
Macro-80, Link-80, Lib-80, CREF-80
Macro-80 595-2666-03, with Link-80, Lib-80, CREF-80, no disks
CP/M manual 595-2776 unopened. with CP/M 2.2 DRI manual copies
Supercalc Zenith manual 597-2663 and Sorcim User's Guide 10. July 1981
CP/M Manual 595-2776 with CP/M 2.2 DRI manuals
Floppy Disk Controller Card H 207
--1982 and 1983 editions
Illustration booklet, install Z-207 drive
H8 systems
Heathkit EUW-19A analog computer
Z-141, Z-151, Z-148 systems
Z-140 PC Owner's manual, half-sized, 595-3393-01, still wrapped
Z-150 Disk Based Diagnostics disks OB-4164-29 , 2 sets each in envelope
Compact Personal Computer H-148 ( 3 copies)
Parts lists and schematics, Z-140 series (3 copies)
Desktop Personal Computer H-151
Heath/Zenith Partnership Packs (2)
Other Heath Zenith computing Web sites
(still there in 2003, again in 2006) has a lot of useful Z-100 information. Check with him
for details. HOwever, the site does not seem to have been very active since about 2003.
Dave Wallace's H8 Web pages dead link as of 2009
Mark Garlanger's heath and Zenith's 8-bit Computers
"Zenith" and "Heath" since 2002
New Jersey, USA
follow this link to email @ me
