View source for MicroVMS

==VMS/MicroVMS==

What is the difference between MicroVMS and VMS?

MicroVMS is a special "downsized" version of [[VMS]] V4.x for the (at that time) new [[MicroVAX]]/[[VAXstation]] models. 
There were no other MicroVMS versions, neither before nor after VMS V4.x.
The very first version of MicroVMS for the MicroVAX I was named MicroVMS V1.0, which sometimes leads to confusion.
MicroVMS V1.0 is probably a kind of pre-release MicroVMS V4.0.
All other MicroVMS versions were numbered exactly like their "big brothers".

Reasons that led to the fork of MicroVMS:
* Cookbook-Style Documentation
* Simplification of System Management
* Hardware restrictions
** [[RX50]]
** [[RD51]] 10MB

Reasons that made MicroVMS unnessary from VMS V5 onwards
* Tape load device [[TK50]]
* Larger disks
* Integration into a [[Local Area VAXcluster]]

MicroVMS Media:
* V4.0: 32 RX50 (without Mandatory Updates) 
* V4.1: 3 RX50
* V4.2: n RX50 / 1 TK50
* V4.2MUP: 1 RX50 / 1 TK50

* V4.5: 16(Base)+25 RX50 / 1 TK50
* V4.6: 16(Base)+26 RX50 / 1 TK50

{| class="wikitable" style="margin:auto"
|+ MicroVAX support in VMS V4.x
|-
! Version !! Type !! Date written !! MicroVAX support
|-
| 4.0 || Full || 23-SEP-1984 || NO
|-
| 4.1 || Update || 11-JAN-1985 || YES: VMS041.A-VMS041 / VMS041.B-VMSONLY / VMS041.C-UVMSONLY
|-
| 4.2 || Full || 12-JUL-1985 || NO
|-
| 4.3 || Update || 9-JAN-1986 || YES: VMS043.A-COMMON FILES / VMS043.B-VMS ONLY / VMS043.C-UVMS ONLY
|-
| 4.4 || Full || 30-MAR-1986 || YES (integral part of all Savesets)
|-
| 4.5 || Update || 26-SEP-1986 || YES: same as with V4.3 (individual Savesets)
|-
| 4.6 || Full || 15-JUN-1987 || YES: same as with V4.4 (integral part of all Savesets)
|-
| 4.7 || Update || 29-OCT-1987 || YES: same as with V4.3 (individual Savesets)
|}


DEC called MicroVMS "retired" from VMS 5.0 onwards

Wikipedia:
MicroVMS was a distribution of VAX/VMS designed for MicroVAX and VAXstation hardware, which had less memory and disk space than larger VAX systems of the time. MicroVMS split up VAX/VMS into multiple kits, which a customer could use to install a subset of VAX/VMS tailored to their specific requirements. MicroVMS releases were produced for each of the V4.x releases of VAX/VMS and was discontinued when VAX/VMS V5.0 was released.

==See also==

* [[The VMS-MicroVMS Merge]]

[[Category: VMS]]