man/man3/gerts.3

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.he 'CONNECT, GERTS (III)'3/15/72'CONNECT, GERTS (III)'
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NAME            connect, gerts -- Gerts communication over 201
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SYNOPSIS        jsr     r5,connect
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(error return)
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...

jsr     r5,gerts; fc; oc; ibuf; obuf
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(error return)
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...
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other entry points:  gcset, gout
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DESCRIPTION     The
GCOS GERTS interface is so bad that
a description here is inappropriate.
Anyone needing to use this interface should
seek divine guidance.
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FILES           /dev/dn0, /dev/dp0
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kept in /lib/liba.a
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SEE ALSO        dn(IV), dp(IV), HIS documentation
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DIAGNOSTICS     --
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BUGS            --