VHD
This page was last modified 01:51, 11 December 2018 by Mars2000you. Based on work by Rderooy and Sander and others.

Contents

Description

VHD means Video High Density and AHD means Audio High Density. This system, released only in Japan by JVC/Victor, is different from the LaserDisc system released by Pioneer. Instead of being on optical disc, similar to a very large CD-ROM it is more similar to a LP record. Just like a LP it had two sides, requiring you to swap the disc over. But unlike LP it had a caddy to protect the disc.

Various movies were released in Japan on VHD format, and VHD was also marketed for use with the MSX and Sharp X1. Compatible VHD players for the MSX and Sharp X1 have the VHDpc logo. Several games were made for this system. Depending on the VHD, the MSX program data was either stored on a separate tape, or was recorded on the VHD itself.

Youtube video about the history and operation of VHD

Help needed
If you have any MSX VHD material, such as an MSX VHD interface adapter, manuals or VHD software we would like your help to potentially enable emulation of VHD hardware and to improve our understanding of the technology. Please create a topic on the Forum here on msx.org with the material you have available.

VHD hardware

VHDpc players

VHD Interfaces for MSX

VHD Interface description

The following table is the interface board decription for the Sharp X1 VHCpc controller interface VO-20PS. The MSX interface might have a similar design to control the same VHDpc compatible players. Taken from http://x1center.org/sdx1/sdx1_0.html

Address R / W Description
0 C * 0 H R / W 8251 Data R / W
0 C * 1 H R / W 8251 control, status
0 C * 2 H W Reset transmit IEO
0 C * 3 H W Reset receive IEO
0 C * 4 H W Send interrupt enabled
0 C * 5 H W Transmit interrupt disabled
0 C * 6 H W Receive interrupt enabled
0 C * 7 H W Reception interrupt disabled
0 C * 8 ​​H R / W 8255 Port A (data transmission / reception)
0 C * 9 H R / W 8255 Port B (serial / parallel switching)
0 C * AH R / W 8255 Port C (handshake signal)
0 C * BH W 8255 mode setting, port C bit control


VHD software for MSX

Only ten software titles are known to exist for MSX, and one unreleased game. Just like the VHD hardware they are very rare and only ever released in Japan.

Product Region Year Title Type
MVIA-101 / VIAM-101 JP 1986 Birdie Try Game
MVIA-102 / VIAM-102 JP 1986 Time Gal Game
MVIA-103 / VIAM-103 JP 1986 Road Blaster Game
VIA-1 JP 1985 VROOM - Motorcycle Race Game
VIA-2 JP 1985 The Players Club Game
VIA-3 JP 1985 Alice in Chemical Reaction:
Alice's Chemical Laboratory
Game
VIA-4 ? JP Unreleased Highway Star Game
VIA-5 JP 1985 Legends of Star Arthur - Planet Mephius Game
VIA-1001 / VIAM-1001 JP 1985 Thunder Storm Game
VIA-1501 JP 1985 Video Scramble Application
VIA-1502 JP 1985 Xevious Map Application


Example

Thunder Storm LX-3 VHD
MSX program for Thunder Storm LX-3