MicroVAX 3800/3900

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 MicroVAX 3900 includes an RA90.

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, and NetBSD.

References

[1] KA655 CPU Module Technical Manual. EK-KA655-TM-001

[2] VAXcluster Systems. Guidelines for VAXCluster System Configurations. EK-VAXCT-CG-006

[3] VAX Systems Performance Summary Featuring VAX 6000 Model 500. EC-N0377-46