Difference between revisions of "MicroVAX 3800/3900"

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(New page: {{Infobox VAX | name = MicroVAX 3800/3900 | codename = Mayfair III | vups = 3.8 | ram = 64 MB max | year introduced = 1989??? | clock speed = 60 ns }} These machines are very similar, th...)
 
(Built around a QBUS)
 
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{{Infobox VAX
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{{InfoboxVAX-Data
 
| name = MicroVAX 3800/3900
 
| name = MicroVAX 3800/3900
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| codename = Mayfair III
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| Announcement = 10 April 1989
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| vups = 3.8
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| Codename = Mayfair III
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| ram = 64 MB max
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| OS-support-VMS = V5.1
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| year introduced = 1989???
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| CPU-name-VMS = KA655
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| clock speed = 60 ns
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| CPU-name-console = KA655
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| CPU-module = [[KA655 CPU|KA655]]
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| Module = M7625
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| Num-proc = 1
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| VMS-CPU = 10
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| VMS-XCPU = 1
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| SID = 0A000005
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| XSID = 01530301
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| CPU-chip = CVAX
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| FPU-chip = CFPA [[#ref_1|[1]]]
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| CPU-technology = CMOS
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| CPU-cycle = 60ns [[#ref_1|[1]]]
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| CPU-clock = 33MHz [[#ref_1|[1]]]
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| Instruction-buffer = 12 bytes [[#ref_1|[1]]]
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| Translation-buffer = 28 entries [[#ref_1|[1]]]
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| Cache = 1KB [[#ref_1|[1]]]
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| Backup-cache = 64KB (120ns) [[#ref_1|[1]]]
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| Compatibility-mode = No
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| Console-processor = CPU
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| Console-device = None
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| Firmware-version = V5.3
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| Minimum-memory = 16MB
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| Maximum-memory = 64MB
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| Memory-checking = 7-bit ECC/longword [[#ref_1|[1]]]
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| BUS-Qbus = 1 @ 3.3MB/s
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| LAN-support = optional
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| VUPs = 3.8 [[#ref_2|[2]]]
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| SPECmarks = 4.0
 
}}
 
}}
  
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These machines are very similar, the only distinction being the enclosure and accompanying drives. The MicroVAX 3900 includes an [[RA90]].
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The '''MicroVAX 3800''' and '''MicroVAX 3900''' are very similar, the only distinction being the enclosure and accompanying [[disk drive]]s: the 3800 was available in the [[BA213]], and the 3900 in the [[H9644 cabinet]]. The MicroVAX 3900 includes an [[RA90]].
  
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The MicroVAX 3900 is the original model of VAX emulated by [[SIMH]]. (It now also emulates a [[VAX 780]].)  It can run [[4.3 BSD]], VMS 5.1-1 to 7.3, [[NetBSD]].
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They both used the [[KA655 CPU]], so both are built around the [[QBUS]], which was used only for [[input/output|I/O]]; [[main memory]] used the [[KA650 Main Memory System]], using a special [[bus]] carried on [[over the back]] connectors as well as the [[CD interconnect]] of the QBUS backplane. (The [[address space]] of the [[QBUS]] was limited to 4MB, and the data section is only 16 bits wide.)
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There were special [[VAXserver]] versions, for usage in [[Local Area VAXcluster]]s, named '''VAXserver 3800''' and '''VAXserver 3900'''. The difference between these and the MicroVAXen is in the system ROM on the [[Central Processing Unit|CPU]] board, which prevents multi-user access to these computers. 
 +
 
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The MicroVAX 3900 is the original model of [[VAX]] emulated by [[SIMH]]. (It now also emulates a [[VAX-11/780]].)  It can run [[4.3 BSD]], [[VMS]] 5.1-1 to 7.3, and [[NetBSD]], and OpenVMS 7.3 under Debian on a Tinkerboard.
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{{semi-stub}}
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==References==
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<div id="ref_1">[1] KA655 CPU Module Technical Manual. EK-KA655-TM-001</div>
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<div id="ref_2">[2] [http://www.vaxhaven.com/images/c/c6/EK-VAXCT-CG-006.pdf VAXcluster Systems - Guidelines for VAXcluster System Configurations] (EK-VAXCT-CG-006)</div>
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<div id="ref_3">[3] VAX Systems Performance Summary Featuring VAX 6000 Model 500. EC-N0377-46</div>
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==External Links==
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* [http://bitsavers.org/pdf/dec/vax/3800/ 3800] - documentation at [[Bitsavers]]
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** [http://www.bitsavers.org/pdf/dec/vax/3800/EK-164AA-IN-001_MicroVAX_3800_VAXserver_3800_Installation_Mar89.pdf MicroVAX 3800 VAXserver 3800 Installation] (EK-164AA-IN-001)
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** [http://www.bitsavers.org/pdf/dec/vax/3800/EK-165AA-OM-001_MicroVAX_3800_VAXserver_3800_Operation_Mar89.pdf MicroVAX 3800 VAXserver 3800 Operation] (EK-16SAA-OM-001)
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* [https://vt100.net/mirror/hcps/168aaom1.pdf MicroVAX 3900 VAXserver 3900 Operation] (EK-168AA-OM-001)
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{{Nav VAX}}
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[[Category: DEC VAX systems]]
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[[Category: QBUS VAXen]]
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[[Category: VAXservers]]

Latest revision as of 07:06, 31 January 2024


MicroVAX 3800/3900
Summary
Announcement date: 10 April 1989
Codename: Mayfair III
OS support (VMS): V5.1
CPU Details
CPU name (VMS): KA655
CPU name (console): KA655
CPU module: KA655
Module: M7625
Number of processors: 1
VMS DCL CPU: 10
VMS DCL XCPU: 1
SID: 0A000005
XSID: 01530301
CPU chip: CVAX
FPU chip: CFPA [1]
CPU technology: CMOS
CPU cycle time: 60ns [1]
CPU clock: 33MHz [1]
Instruction-buffer: 12 bytes [1]
Translation-buffer: 28 entries [1]
Cache: 1KB [1]
Backup cache: 64KB (120ns) [1]
Compatibility mode: No
Console processor: CPU
Console device: None
Firmware version: V5.3
Memory
Minimum memory: 16MB
Maximum memory: 64MB
Memory checking: 7-bit ECC/longword [1]
I/O
Q-bus: 1 @ 3.3MB/s
LAN support: optional
Performance
VUPs: 3.8 [2]
SPECmarks: 4.0


The MicroVAX 3800 and MicroVAX 3900 are very similar, the only distinction being the enclosure and accompanying disk drives: the 3800 was available in the BA213, and the 3900 in the H9644 cabinet. The MicroVAX 3900 includes an RA90.

They both used the KA655 CPU, so both are built around the QBUS, which was used only for I/O; main memory used the KA650 Main Memory System, using a special bus carried on over the back connectors as well as the CD interconnect of the QBUS backplane. (The address space of the QBUS was limited to 4MB, and the data section is only 16 bits wide.)

There were special VAXserver versions, for usage in Local Area VAXclusters, named VAXserver 3800 and VAXserver 3900. The difference between these and the MicroVAXen is in the system ROM on the CPU board, which prevents multi-user access to these computers.

The MicroVAX 3900 is the original model of VAX emulated by SIMH. (It now also emulates a VAX-11/780.) It can run 4.3 BSD, VMS 5.1-1 to 7.3, and NetBSD, and OpenVMS 7.3 under Debian on a Tinkerboard.

References

[1] KA655 CPU Module Technical Manual. EK-KA655-TM-001
[3] VAX Systems Performance Summary Featuring VAX 6000 Model 500. EC-N0377-46

External Links


v • d • e VAX Computers and Operating Systems
VAX-11/7xx (including VAX 86x0) - VAX-11/780 • VAX-11/785 • VAX-11/750 • VAX-11/730 • VAX 8600 • VAX 8650

VAX 8000 series (excluding VAX 86x0) - VAX 82xx/83xx series • VAX 85x0/8700/88xx series

MicroVAXen (many types also come in VAXserver and VAXstation models) - MicroVAX I • MicroVAX II
MicroVAX 2000 • MicroVAX 3100 • MicroVAX 3300/3400 • MicroVAX 3500/3600 • MicroVAX 3800/3900

VAXstation Series - VAXstation I • VAXstation II
VAXstation 3100 • VAXstation 3200/3500 • VAXstation 3520/3540 • VAXstation 8000

Late Model VAXen - VAX 4000 series • VAX 6000 series • VAX 7000 series • VAX 9000 series • VAX 10000 series

Special Purpose VAXen - VAXft series • rtVAX series • Infoserver series

Clones - CM 1700 • TPA-11/580

Operating Systems: VMS • VAXELN • ULTRIX • BSD UNIX

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