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General Description

VAX and PDP11 Hardware Virtualization allows users of HP VAX and PDP11 (Previously known as DIGITAL VAX and PDP11) computers to move application software and user data to a modern Intel or AMD based x86 compatible platform without having to make changes to software and data. VAX and PDP11 Hardware Virtualization is a software solution that replaces VAX and PDP11 hardware.

This approach is best understood when the VAX and PDP11 Hardware Virtualization Software is viewed as a special interface between the old VAX and PDP11 software and a new hardware platform. Basically, the CHARON software presents a VAX and PDP11 hardware interface to the original VAX and PDP11 software, so that the existing software cannot detect a difference. This means no changes have to be made to the existing software. User programs and data can be copied to a new modern industry standard server (64-bit or 32-bit Intel or AMD) and continue to run for many more years.

The VAX and PDP11 virtualization software is designed to replace single and multi-CPU VAX and PDP11 computer systems, including:

PDP11/93
PDP11/94
MicroVAX II
MicroVAX 3600, 3900
MicroVAX 3100 models 96 and 98
VAXserver 3600, 3900
VAX 4000 models 106, 108, 700, and 705
VAXstation 4000 model 90
VAX 6310
VAX 6610, 6620, 6630, 6640, 6650 and 6660

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The principles of VAX and PDP11 Hardware Virtualization

Virtualized hardware

CHARON-VAX and CHARON-PDP virtualize various VAX and PDP11 architectures and meet or exceed the performance level of these VAX and PDP11 systems when run on the recommended hardware platform. Our VAX and PDP11 emulator product is currently available in the following variants:

CHARON-PDP includes:

- PDP11/93
- PDP11/94

CHARON-VAX/XM and CHARON-VAX/XM PLUS include:

- MicroVAX II
- MicroVAX 3600
- MicroVAX 3900
- VAXserver 3600 (includes both the standard version supporting 64 MB of RAM and a custom version supporting up to 128Mb of RAM)
- VAXserver 3900 (both standard and special versions supporting up to 128Mb of RAM)
- MicroVAX 3100 model 96
- VAX 4000 model 106
- VAXstation 4000 model 90

CHARON-VAX/XK PLUS, CHARON-VAX/XL, and CHARON-VAX/XL PLUS include:

- MicroVAX 3100 model 98
- VAX 4000 model 108
- VAX 4000 model 700
- VAX 4000 model 705
- VAX 6310
- VAXserver 3600 (custom version with maximum emulated memory size of 512 MB (XL and XL PLUS) and 256 MB (XK PLUS))
- VAXserver 3900 (custom version with maximum emulated memory size of 512 MB (XL and XL PLUS) and 256 MB (XK PLUS))

CHARON-VAX/6610 includes:

- VAX 6610

CHARON-VAX/6620 includes:

- VAX 6620

CHARON-VAX/6630 includes:

- VAX 6630

CHARON-VAX/6640 includes:

- VAX 6640

CHARON-VAX/6650 includes:

- VAX 6500

CHARON-VAX/6660 includes:

- VAX 6660

The main difference between CHARON-VAX/XK PLUS and CHARON-VAX/XL (PLUS) products is in the amount of the maximum emulated memory: 512 MB for CHARON-VAX/XL (PLUS) and 256 MB for CHARON-VAX/XK PLUS.

"PLUS" in the name of the products refers to an ability to use the "Advanced CPU Emulation" (ACE) feature that significantly improves emulated VAX pereformance (approximately in 2.5 times).

The following table explains which hardware boards CHARON virtualizes:

Subsystem	Covered VAX and PDP11 hardware
Serial Lines Controllers	UART, QUART, CXA16, CXB16, CXY08, DHQ11, DHV11, DZV11, DZQ11, DL11, DLV11, DZ11, DHW42-AA, DHW42-BA, DHW42-CA
XMI Disks/Tapes Controllers	KDM70
BI Disks Controllers	KDB50
QBUS Disks Controllers	RQDX3
QBUS/UNIBUS Tapes Controllers	TQK50, TUK50
SCSI Controllers	NCR53C94
DSSI Subsystem	SHAC, HSD50
CI Subsystem	CIXCD, HSJ50
Network Controllers	DEQNA, DESQA, DELQA, DEUNA, DELUA, DEMNA, DEBNI, PMADAA

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Host platform

The Virtualization Software presents standard VAX and PDP11 devices to the VAX and PDP11 operating system, allowing the OS to function as though it were still running on a VAX and PDP11 computer. For example, virtual disk container files in a directory or physical devices of the host Windows platform are presented by the Virtualization Software to the VAX and PDP11 OS as emulated SCSI disks attached to a SCSI adapter.

With the use of current storage technology, disks do not have to be physically attached to the Host platform, they can also reside on a SAN or iSCSI storage structure.

A similar translation process is also valid for other emulated hardware devices.

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