Heathkit H-11A Computer

The H-11 in my collection hasn't yet been fully evaluated but it does run without smoking. Look for updates and here as time permits.

The H-11 came pretty much fully documented. Here are the Assembly manual and schematics

Add additional information or comments to this page:

Please use these comments to add to or correct the contents of this page. If you are looking for information, software or hardware please consider posting on the Vintage Computer Forums. If you have something for sale please consider using the new Vintage Computer and Gaming Marketplace

Please be aware that the email address you post will be posted in the clear. Spam bots can and will pick it up and use it. Please protect your email address by obfuscating it (i.e. webmasterNOSPAM@vintage-computerNOSPAM.com) or use an address with a good spam filter. Also consider using the Vintage Computer Forums or the Vintage Computer and Gaming Marketplace as mentioned above.

Your Name:

Your email address:

What would you like to add:
Please enter "BLUE" in the field below as a Check String:

Description
Manufacturer	Heath/Zenith
Model	H-11A
Date Announced	November, 1977
Date Canceled	Unknown
Number Produced	Thousands to Tens of thousands
Country of Origin	USA
Price	$1,200 in kit form
Current Value	$50-$500

Specifications
Processor	LSI-11
Speed	About 2.5 MHz
RAM	32K words
ROM	Up to 8K
Storage	Paper Tape, 8" floppy disks
Expansion	7 slots
Bus	LSI
Video	N/A
I/O	Serial, Parallel
OS Options	HT-11, UCSD-P, others

Notes	The Heathkit H-11 was an expensive alternative to the Heathkit H-8 Computer that was supposed to provide the power of a DEC PDP-11/03 on the desktop. Unfortunately, mainly due to memory constraints, it wasn't quite able to do this but it was still a very serviceable machine. It's cost did keep it from becoming too popular.

Related Items in Collection	H27 8" disk subsystem, tons of manuals, software and more.
Related Items Wanted	Additional software, manuals, and the Heathkit H-10 paper tape subsystem.