The Z-89 is a personal computer introduced in 1979 by Heathkit, but produced primarily by Zenith Data Systems (ZDS) in the early 1980s. It combined an updated version of the Heathkit H8 microcomputer and H19 terminal in a new case that also provided room for a built-in floppy disk on the right side of the display. Based on the Zilog Z80microprocessor it is capable of running CP/M as well as Heathkit's own HDOS.
The Zenith Z-89 is based on the Zilog Z80microprocessor running at 2.048 MHz, and supports the HDOS and CP/M operating systems. The US$2295 Z-89 is integrated in a terminal-like enclosure with a non-detachable keyboard, 12-inch monochrome CRT with a 80x25 character screen, 48 KB RAM, and a 5.25" floppy disk drive.[1]
The keyboard is of high build quality and has an unusual number of special purpose keys: REPEAT, ESC, Tab ↹, CAPS, CTRL, SCROLL, RESET, BREAK, BACK SPACE, LINE FEED, DELETE, and three with white, red, and blue squares. There are five function keys and a numeric keypad. The video display has reverse video and character graphics are available.
The computer has two small card cages inside the cabinet on either side of the CRT, each of which accept up to three proprietary circuit cards. Upgrade cards available for this included disk controller cards (see below), a 16 KB RAM card that upgrades the standard 48 KB RAM to 64 KB, a RAM memory card accessible as a ramdrive using a special driver (above the Z80's 64 KB memory limit) and a multi-serial card providing extra RS-232 ports. The 2 MHz Z80 could be upgraded to 4 MHz.
In 1979, prior to Zenith's purchase of Heath Company, Heathkit designed and marketed this computer in kit form as the Heath H89, assembled as the WH89, and without the floppy but with a cassette interface card as the H88. (Prior to the Zenith purchase, the Heathkit model numbers did not include the dash).
Heath/Zenith also made a serial terminal, the H19/Z-19, based on the same enclosure (with a blank cover over the diskette drive cut-out) and terminal controller. The company offered an upgrade kit to convert the terminal into a full H89/Z-89 computer.
Another configuration, the Z-90, changes the floppy drive controller from the hard-sectored controller (max 100 kB) to a soft-sectored controller that supported double-sided, double density, 96 tpi drives with a capacity of 640 kB. It also came standard with 64 KB of RAM.
There were several external drive systems available for the H89/Z-89.
The H77/Z-77 and H87/Z-87 supports up to two additional Single-Sided, Single Density, 48 tpi 5.25" drives. When connected to the standard hard-sectored controller, it stores 100 kB per floppy. By connecting it to a soft-sectored controller, it stores 160 kB per floppy.
The H37/Z-37 supports up to two Double-Sided, Double Density, 96 tpi 5.25" drives and requires the soft-sectored controller. Each drive has a capacity of 640 kB.
The Z-47 supports two 8" floppy drives and requires its own interface card. It uses standard IBM 3740 floppy disks with has a capacity of 1.2 MB each.
The Z-67 is a 10 MB Winchester Drive plus one 8" floppy drive and also requires its own interface card.
In France, the Heath/Zenith Data System branch connected the 10 MB removable cartridge hard disk, manufactured by Bull in Belfort
A maximum of two disk controller cards can be installed in a standard system.
Receptionedit
Creative Computing described the Heath H89 as "the most professional looking" microcomputer available. Stating that the computer was "one of the finest" available for less than $3000, the magazine predicted that it "can have a major impact on the small computer market" if good software became available for it.[2]BYTE wrote that the H89 "has a number of unique hardware features and the same excellent software support and documentation as the original H-8 system".[1]
Summaryedit
Display
integral 12" monochrome CRT (choice of white or green), 80 × 25 characters (25th line was a special status line)
Classic Heathkit Computers and Heathkit H89 Emulators in Javascript (online) and C++
Actual scanned Heathkit/Zenith Catalogs with much more information
Emulatorsedit
Github project page for the Virtual H89 emulator
January 01, 1970
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The Z 89 is a personal computer introduced in 1979 by Heathkit but produced primarily by Zenith Data Systems ZDS in the early 1980s It combined an updated version of the Heathkit H8 microcomputer and H19 terminal in a new case that also provided room for a built in floppy disk on the right side of the display Based on the Zilog Z80 microprocessor it is capable of running CP M as well as Heathkit s own HDOS Zenith Z 89Zenith Z 89 in Paris 2008Also known asHeathkit H89ManufacturerZenith Data Systems ZDS TypePersonal computerRelease date1979 45 years ago 1979 Introductory priceKit version with 1 floppy drive US 1800 in 1979 circa equivalent to 7 600 in 2023 Discontinued1985 1985 Operating systemROM monitor HDOS CP M UCSD Pascal P System Pascal or MP MCPU2x 2 048 MHz Zilog Z80 one for the terminal MemoryRAM 16 KB 48 KB on main board optional 16 KB memory card max addressable CP M 64 KB HDOS 56 KB Display12 monochrome CRT 80 x 25 character textSoundBeeperConnectivity3 serial 1 Centronics parallel optional external diskette drive connectorRelatedHeathkit H88 Heathkit H88 computer Heathkit H89 aka Zenith Z 89 This unit has two half height DD diskette drives in place of the single full height original Contents 1 Description 2 Reception 3 Summary 4 References 5 External links 5 1 Reference and description 5 2 EmulatorsDescription editThe Zenith Z 89 is based on the Zilog Z80 microprocessor running at 2 048 MHz and supports the HDOS and CP M operating systems The US 2295 Z 89 is integrated in a terminal like enclosure with a non detachable keyboard 12 inch monochrome CRT with a 80x25 character screen 48 KB RAM and a 5 25 floppy disk drive 1 The keyboard is of high build quality and has an unusual number of special purpose keys REPEAT ESC Tab CAPS CTRL SCROLL RESET BREAK BACK SPACE LINE FEED DELETE and three with white red and blue squares There are five function keys and a numeric keypad The video display has reverse video and character graphics are available The computer has two small card cages inside the cabinet on either side of the CRT each of which accept up to three proprietary circuit cards Upgrade cards available for this included disk controller cards see below a 16 KB RAM card that upgrades the standard 48 KB RAM to 64 KB a RAM memory card accessible as a ramdrive using a special driver above the Z80 s 64 KB memory limit and a multi serial card providing extra RS 232 ports The 2 MHz Z80 could be upgraded to 4 MHz In 1979 prior to Zenith s purchase of Heath Company Heathkit designed and marketed this computer in kit form as the Heath H89 assembled as the WH89 and without the floppy but with a cassette interface card as the H88 Prior to the Zenith purchase the Heathkit model numbers did not include the dash Heath Zenith also made a serial terminal the H19 Z 19 based on the same enclosure with a blank cover over the diskette drive cut out and terminal controller The company offered an upgrade kit to convert the terminal into a full H89 Z 89 computer Another configuration the Z 90 changes the floppy drive controller from the hard sectored controller max 100 kB to a soft sectored controller that supported double sided double density 96 tpi drives with a capacity of 640 kB It also came standard with 64 KB of RAM There were several external drive systems available for the H89 Z 89 The H77 Z 77 and H87 Z 87 supports up to two additional Single Sided Single Density 48 tpi 5 25 drives When connected to the standard hard sectored controller it stores 100 kB per floppy By connecting it to a soft sectored controller it stores 160 kB per floppy The H37 Z 37 supports up to two Double Sided Double Density 96 tpi 5 25 drives and requires the soft sectored controller Each drive has a capacity of 640 kB The Z 47 supports two 8 floppy drives and requires its own interface card It uses standard IBM 3740 floppy disks with has a capacity of 1 2 MB each The Z 67 is a 10 MB Winchester Drive plus one 8 floppy drive and also requires its own interface card In France the Heath Zenith Data System branch connected the 10 MB removable cartridge hard disk manufactured by Bull in Belfort A maximum of two disk controller cards can be installed in a standard system Reception editCreative Computing described the Heath H89 as the most professional looking microcomputer available Stating that the computer was one of the finest available for less than 3000 the magazine predicted that it can have a major impact on the small computer market if good software became available for it 2 BYTE wrote that the H89 has a number of unique hardware features and the same excellent software support and documentation as the original H 8 system 1 Summary editDisplay integral 12 monochrome CRT choice of white or green 80 25 characters 25th line was a special status line Storage 5 25 diskette drive originally hard sectored 100 KB Operating System HDOS CP M UCSD Pascal P System Pascal or MP MReferences edit a b Dahmke Mark August 1980 The Heath H 89 Computer BYTE Vol 5 no 8 p 46 Retrieved 18 October 2013 Heuer Randy April 1980 Heathkit WH 89 All in One Computer Creative Computing Vol 6 no 4 pp 18 21 Retrieved 2022 04 16 Notes Inflation Conversion Factors for DollarsExternal links editReference and description edit obsoletecomputermuseum org zenith Classic Heathkit Computers and Heathkit H89 Emulators in Javascript online and C old computers com Connecting a virtual diskette drive to the H89 Actual scanned Heathkit Zenith Catalogs with much more information Emulators edit Github project page for the Virtual H89 emulator Retrieved from https en wikipedia org w index php title Zenith Z 89 amp oldid 1209917582, wikipedia, wiki, book, books, library,
