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* * * LDEVMLTS Program Specifications * * *
Virtual Machine Multiple Logical Terminal Session Emulator
This program provides a facility to emulate much of the multiple
logical terminal function/features of the IBM 3174 Control Unit.
This facility runs in an ESA-MODE CMS virtual machine employing the
VM Logical Device Control Facility to create multiple logical VM
terminal sessions. Like the MLT hardware the user can toggle thru
the different active sessions by way of the "jump" key. The sessions
will be re-displayed in round-robin sequential fashion (1-2-3-...-1).
Each non-displayed session is saved in the MLTS Service Machine as a
3270 datastream built from a Read Buffer I/O command. The datastream
buffer may be updated while in storage if an ACCEPT is posted by CP
for the Logical Terminal to receive data. Upon re-display, the most
recent 3270 datastream sent by CP is presented to the physical terminal.
The simulator will present up to 8 sessions for each dialed port.
Currently we support a four dialed ports, but future plans are for
512 dialed ports per service machine.
Each locally attached VM terminal will emulate up to eight logically
independant terminals without the expense of mlt hardware upgrades.
- 2 thru 8 Logical Sessions per Dialed Port.
- Future plan 512 dialed ports per MLTS Service Machine, currently 16.
- User selected PA or PF key provides the "jumping" or "toggling" key.
in forward and backward directions.
- Keyword exit to permit detachment (CP RESET) from the Service Machine.
- Service Machine console logging of exceptional MLTS events.
- Supported on VM/ESA.
- Support for 3270 extended and non-extended datastream logical terminals.
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