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Texas Instruments HX-1000 Printer / Plotter

Date of introduction:  1983 Display technology:  
New price:  $199.95 (MSRP 1983) Display size:  
Size:  4.6" x 5.8" x 1.7"
 148 x 118 x 44 mm3
Printer technology:  Ball point Pen
Weight:  22.9 ounces, 650 grams Serial No:  102484
Batteries:  5*AA NiCd Date of manufacture:  mth 01 year 1984
AC-Adapter:  AC9203 Origin of manufacture:  Japan
Precision:   Integrated circuits:  
Memories:   HEX-BUS Device ID:  10,11
Program steps:   Courtesy of:  Joerg Woerner
    Download manual:   (US: 9.0 MByte)

Texas Instruments designed in 1982 with the HEX-BUS a very innovative interface to connect intelligent peripherals like printers, modems or even a video interface to its new Compact Computer System CC-40 and planned to use it with the never released TI-99/8 home computer.

The physical interface of the HEX-BUS is a rather simple 8-pin connector and with peripherals having always two HEX_BUS ports, multiple peripherals can be connected in a daisy-chain mode. The Hardware of the HEX-BUS uses four Data-Signals [D0, D1, D2, D3], two Handshake-Signals [HSK], [BAV] and a common ground signal [GND]. The remaining line was reserved for future use and labeled [FUT]. With the drivers being "open collector", the interface allows bi-directional data communication, each Byte is transmitted in two 4-bit words in a Master/Slave protocol. Texas Instruments published not only the specifications of the HEX-BUS and the software requirements for peripherals, but even offered two different Intelligent Peripheral Bus Controllers (IBC), realized as ASICs (Application Specification Integrated Circuits):

TI # 1052911, LSI Logic ASIC L1A0037, 22 pin Package
TP0370, new version, 28 pin package

Texas Instruments dropped out of the home computer market in March 1984 - after selling more than 2.5 million of the famous TI-99/4A - and production of the CC-40 was ceased immediately after. Consequently was the development of the HEX-BUS terminated and only a few of the already announced HEX-BUS peripherals were manufactured in significant quantities. Interesting fact to know: The TI-74 BASICALC and TI-95 PROCALC computers introduced in 1985 as successor of the CC-40 use a 10-pin Dock-Bus which is compatible to the HEX-BUS and added three signals: [RESET] and System Power Distribution In [PI] and Out [PO] to power peripherals from the computer or the computer from peripherals.

Texas Instruments announced or released during the short live of the Compact Computer 40 eight different products like printers, plotters and even a serial interface using the HEX-BUS Interface. Additional peripheral devices were planned or released from Third Party vendors but are not listed as of now in our overview:

Part

Name / Description

MSRP (1983)

Status

HX-1000 Printer / Plotter 4 colors $199.95 Series
HX-1010 Printer 80 (Thermal ribbon) $249.95 Series
HX-1100 Video Interface $99.95 Prototype
HX-2000 Wafertape Digital Tape Drive $139.95 Prototype
HX-3000 RS-232 Interface $99.95 Series
HX-3000/P RS-232 + Parallel Interface $124.95 Series
HX-3100 Data Modem $99.95 Series
HX-5102 Disk Drive/Controller t.b.d. Prototype

Texas Instruments introduced with the HX-1000 Printer / Plotter an x-y plotter with four-color capability using 2½" (63 mm) wide plain paper. In addition to x-y plotting, it can print up to 36 characters per line at a speed of up to 12 characters per second. It connects with the HEX-BUS Interface to the Compact Computer System CC-40 and other devices supporting the HEX-BUS specifications.

Dismantling this HX-1000 Printer / Plotter manufactured in January 1984 in Japan by an unknown OEM reveals an ALPS Micrographic Printer DPG 1302, with the following key specifications:

Print method: Ball point Pen
Printing speed: 12 characters/second
Characters/line: 18 standard, 36 compressed
Printing area: 43.2 mm, 216 steps
Line drawing speed x,y axis 52 mm/sec
Line drawing speed diagonal 73 mm/sec
Line drawing resolution x,y axis 0.2 mm

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If you have additions to the above article please email: joerg@datamath.org.

Joerg Woerner, October 25, 2019. No reprints without written permission.