Sanyo PHC-25 (1982)

Sanyo PHC-25

In the eighties many companies tried to compete in the growing home computer market with one or more products. Some companies made history, other had a niche following, some others didn’t succeed or were successful in a few countries only.

The PHC-25 was released in Japan in 1982 and sold worldwide in 1983, but there’s very little information about it, so it probably wasn’t very successful – even Wikipedia just features a one-line description and the bare technical details of the machine. The French site phc25.com has more information about it. Since I got this computer in a lot of items I bought from eBay France in spring 2015, and all the photographs on google have the “ordinateur individuel” sticker, I can deduce that the PHC-25 had a small following in that nation. In the US, the PHC series was presented to the public at the 1983 Winter CES in Las Vegas [1] at the price of $264 [2].

The PHC-25 is the most powerful in a family of three models released by Sanyo, the other two being the PHC-10 and the PHC-20. Based on a Z80A compatible processor, when turned on the computer asks which graphic screen mode to use for the session; the available RAM depends on that choice.

Here are the top and rear views of the computer:

Sanyo PHC-25 top and rear views

To reduce the size of the computer, the motherboard is split in two layers, connected by a flat cable.

Sanyo PHC-25 motherboard

As you can see in the teardown view, the keyboard is quite simple – just the keys and the rubber pads.

Sanyo PHC-25 teardown

Sadly the computer stopped working just before publishing the article, so I couldn’t take a last picture of the machine turned on and connected to a TV. I will ask a friend to lend me a hand to repair it in the next few months.

Sanyo PHC-25

[1] InfoWorld magazine, 31 january 1983
[2] Collectible Microcomputers by Michael Nadeau, 2002

4 thoughts on “Sanyo PHC-25 (1982)

  1. Ian Edwards

    Have you considered sharing one of your photos for the Wikipedia article?

    It would be great if the wikipedia page also had a link to your page (in the references section) so that people can see the full teardown!

    Reply
  2. Carlos Camacho

    Would be good to get really high resolution photos of motherboards from top down angle and also bottom up angle. Would like to design a schematic.

    Reply

Leave a Reply

This site uses Akismet to reduce spam. Learn how your comment data is processed.