Boots – shoes – and leggings
Patent
1982-04-12
1986-03-04
Thomas, James D.
Boots, shoes, and leggings
340347DD, G06F 500
Patent
active
045743622
ABSTRACT:
Block mode is a method of formatting data when sending it to and from the host computer. Some host computer operating systems make it difficult for the user's program to send or receive the full ASCII character set. The block mode protocol lets you send and receive messages which use the full ASCII character set (including lowercase characters and control characters), even though your host computer's operating system makes it difficult to send and receive certain ASCII characters. (Indeed, even full eight-bit binary data bytes may be sent to or from the terminal in block mode.) This is accomplished by means of a packing scheme, in which messages using the full character set are packed into character strings using a subset of that character set.
Also, the block mode protocol provides error detection and automatic retransmission of bad data blocks. This lets you transfer data to and from the terminal, without errors, despite occasional noise on the communications line. Block mode is completely independent of whether or not prompt mode is used and of whether the terminal is using full duplex or half duplex communications.
When in block mode, data is packed into blocks and transmitted as a unit. Each block contains an "even/odd" counter (block control byte one, bit one) which is used in an "ACK/NAK" protocol. This protocol lets the host and terminal inform each other when a block has been received incorrectly. (The block received incorrectly is then retransmitted.)
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Ast, Jr. Vincent N.
Brown Gary L.
Spindel Howard R.
Clark David L.
Gray Francis I.
Jones Allston L.
Tektronix Inc.
Thomas James D.
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