Miniature computer with separate hand-held controller

• US 4,364,112 A
• Filed: 05/14/1980
• Issued: 12/14/1982
• Est. Priority Date: 04/25/1977
• Status: Expired due to Term

• Current Assignee: Hitachi, Ltd.
• Original Assignee: Hitachi, Ltd.
• Inventors: Watari, Masao, Ohsawa, Akira, Onodera, Toru, Nishino, Hideki
• Primary Examiner(s): Springborn, Harvey E.
• Application Number:
  US06/149,581
• Time in Patent Office: 944 Days
• Field of Search: 364/200 MS File, 364/900 MS File
• US Class Current: 708/142
• CPC Class Codes: G06F 15/7864 on more than one IC chip
• CPC Class Codes: H05K 1/14 Structural association of two or more printed circuits providing electric connection to or between printed circuits H05K1/11, H01R12/00

Abstract

A miniature computer has a main section which includes a central processor, a read only memory storing a monitor program, a random access memory for executing the monitor program and a controlling circuit for peripheral equipment, and a hand-held controller electrically connected to the main section through a flat cable, the hand-held controller having a keyboard and display device such that the keyboard has keys of numerals 0 to 9 and the alpha characters A to Z for enabling data in the form of symbolic language to be input according to an assembler program. The assembler program is stored in the read only memory and the symbolic language data is converted to corresponding machine language. The hand-held controller includes a key input system which utilizes encoders rather than mulitplexers to detect and transmit key input data data to the main section.

Claims

1. A miniature computer comprising

a main section including a central processor, a read only memory for storing a program to control said central processor, and a random access memory connected to said central processor for reading out and writing in data under control of said central processor, said central processor, said read only memory and said random access memory being interconnected by a common bus and being mounted together in a compact housing;

and

a hand-held control device mechanically separated from and electrically connected by cable means to said main section, said control device including a controlling keyboard for providing manual input command signals to said main section and display means for displaying said manual input command signals, said controlling keybord having keys corresponding to the numerals of 0 to 9 and the alpha characters of A to Z for inputting data in the form of symbolic language command signals according to an assembler program;

wherein said read only memory stores an assembler program for converting said symbolic language command signals to corresponding machine language control signals; and

wherein said display means includes a segment driver circuit for displaying said symbolic language data inputted via said keys.

2. A miniature computer according to claim 1, wherein said control device comprises a keyboard matrix having row lines and column lines disposed in matrix form and means to connect said column lines to said row lines selectively under depression of said keys;

decoder means for producing a timing signal on a selected one of said column lines in response to a binary coded input signal supplied by said main section through said cable means; and

encoder means for transmitting a binary coded output signal through said cable means to said main section in response to the timing signal transmitted on said selected one of said column lines under depression of a selected one of said keys, whereby a combination of said binary coded input and output signals is provided to said main section as a binary coded signal corresponding to the depressed key.

3. A miniature computer according to claim 2, wherein said control device includes a circuit for generating a voltage to energize said display means based on a voltage received from said main section.

4. A miniature computer according to claim 1, further including timer processing means for generating a periodic timer processing signal, means for generating a nonmaskable interrupt signal (NMI) to be delivered to said central processor under predetermined conditions, and delay means for delaying said nonmaskable interrupt signal (NMI) to be delivered to said central processor until the completion of said timer processing signal.

5. A miniature computer according to claim 1, wherein said delay means includes a counter means for delivering said nonmaskable interrupt signal to said central processor.

6. The miniature computer according to claim 1, further including a pair of power supply terminals and protection means comprising a diode connected between said power supply terminals.