87 lines
3.4 KiB
Plaintext
87 lines
3.4 KiB
Plaintext
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README.DOC
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December 13, 1985
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This diskette contains two versions of ISAM.
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One version, ISAM.EXE, is version 2.30, and should be
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used if you have a stand-alone, or non-IBM PC environment.
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If it is used in a network environment, locking affects the
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entire file instead of a single record. It will allow ISAM
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files OPENed for INPUT to be read simultaneously by
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different processes, however. There are also some speed im-
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provements over ISAM.EXE version 2.26. This version of ISAM
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will support MS-NET compatible networks as well as the
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IBM PC-NET.
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The second version of ISAM is designed to be used in an IBM
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PC-NET network environment and requires PC-DOS v 3.1 or
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greater. It consists of three files: NISAM.EXE, ISAM.SRV,
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and ISAM.RDR.
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NISAM.EXE is the front end ISAM command processor, version
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3.0. The commands it accepts are:
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NISAM START SRV | RDR {/S:NNNNN} --start network ISAM
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(/S: specifies buffer size)
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NISAM STOP --stop ISAM & free memory
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NISAM SHARE --show share list, as with
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server
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NISAM SHARE shortname=d:\path --share a directory with
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the specified shortname
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NISAM SHARE d:\path --share the specified
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directory
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NISAM SHARE shortname|d:\path /D --stop sharing the short-
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name or directory
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NISAM FILE --show the currently OPEN
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ISAM files
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NISAM CLOSE name --close the specified open
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file
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ISAM.SRV is the server version of ISAM which can service
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ISAM requests. It is activated by the NISAM START SRV
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command. This command should be given on a network
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server machine when requests for ISAM files located on that
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machine will be made either locally or across the network.
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ISAM.RDR is the redirector version of ISAM, and is activated
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by the NISAM START RDR command. This command should be
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given on network machines that run programs that access ISAM
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files located only on other, server machines.
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Thus, ISAM files must be located on a server, and the ISAM
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on that machine must be activated with the NISAM START SRV
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command.
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Note: It is possible, in the same network, to have some
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machines running ISAM.EXE and others running NISAM.EXE.
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We do not recommend it, however. It is NOT possible to
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have the same machine running both ISAM.EXE and NISAM.EXE
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at the same time.
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Like the network server, network directory paths must be
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shared using the NISAM SHARE command. The command syntax
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has been modeled after the NET SHARE command. You MUST
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NISAM SHARE the same directories that you NET SHARE, using
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the SAME syntax used in the NET SHARE command.
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For example, on a server named ZEKE you would type:
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NET SHARE PAYABLE=C:\LEDGER\PAYABLE
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NISAM SHARE PAYABLE=C:\LEDGER\PAYABLE
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Then, the user on another machine who wants to use an ISAM
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file in the C:\LEDGER\PAYABLE directory on the server named
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ZEKE would type:
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NET USE E: \\ZEKE\PAYABLE
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and then run the application which OPENs the ISAM file on
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drive E:.
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The application can be passed the name of the machine\short-
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name to do an explicit OPEN using the "VALUE OF FILE-ID"
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clause. For example:
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VALUE OF FILE-ID "\\ZEKE\PAYABLE\MASTER.DAT".
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