Disk Systems for the H8 and H/Z-89/90 Computers

Heath Company and ZDS offered many storage options for the H8 and H-89 computers.The H8 initially only offered a cassette drive or paper tape punch/reader, but once disk drives were available, cassettes and paper tape quickly faded away.

Disk Controllers

Heath Company offered 3 different controllers for the H8 and 4 controllers for the H89. There were also third party companies that offered other controllers.

H8 Controllers

H-8-17 - 5.25" Hard-sectored floppy disk controller

WH-8-47 - 8" Floppy disk controller.

WH-8-37 - Supported both 5.25" soft-sectored floppies and the Z-67 disk system.

H89 Controllers

H-88-1 - 5.25" Hard-sectored floppy disk controller

Z-89-37 - 5.25" Soft-sectored floppy disk controller

WH-89-47/Z-89-47 - 8" floppy disk controller

Z-89-67 - SASI Winchester disk controller

The most common disk system for the H89 used 5.25" hard-sectored disks. The H-88-1 disk controller card came standard on the H89/Z89 and was connected to the internal floppy disk drive. The H-88-1 was an optional upgrade for the H88. The Z-89-37 controller allowed use of the more common soft-sectored diskettes and was required to support the double-sided/double density/96 TPI drives. The Z-89-37 came standard on the Z90, it was an optional upgrade for the H88/H89/Z89. Heath Company also offered the Z-89-47 controller to support dual 8" floppy drives in the Z-47, and the Z-89-67 controller to support the 8" Winchester (SASI) disk drive in the Z-67. 

External Cases

H-17/H17-3 - An external case, which came in kit-form, with support for up to 3 - 5.25" floppy disk drives. These drives were single-sided/single-density/48 tpi. This was marketed to be used with the H8, but it can also be used with the H-89.

H-37/Z-37 - An external case with support for up 2 - 5.25" floppy disk drives. These drives were double-sided/double-density/96 tpi.

Z-47 - An external case that came with two 8" floppy disk drives. 

Z-67 - An assembled external case with a 10 MB SASI Winchester drive and one 8" floppy disk drive.

H-77 - An external case which supports up to 2 -5.25" floppy disk drives. These drives were single-sided/single-density/48 tpi.

Z-87 - An assembled external case that came with 2 -5.25" disk drives. These drives were single-sided/single-density/48 tpi.


Printers

H-14

WH-24-1 - TI-810

H-25

H36 - LA36 DEC Writer II Printer/Terminal

H-44 - Diablo 1640 Daisy Wheel Printer

Modems

WH-13 - Cat Acoustic Modem by Novation

WH-23 - Lexicon Lex-11 Acoustic Modem

WH-33 - UDS Direct-Connect Modem

WH-43 - Hayes Stack Smartmodem

Other

WH-12 - Type-N-Talk Speech Synthesizer by Votrax

Last Modified: Friday, 03-Mar-2017 23:42:48 PST

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This site is dedicated to preserving the history of the original Heathkit computers. They were initially release in 1977 and included the 8-bit H-8 and 16-bit H-11 systems. The H89 was released in 1979.