11
Jan
15

Some Maintenance on a Canon A-200 20HD

Quite some time ago when I was back at my parents place I had a look at a Canon XT clone, the A-200 20HD. There were a few basic repairs needed, so when I recently saw my parents I spent some time on it.

Yuasa Battery

First thing I did was remove the Ni-Cad battery from the memory expansion board, to prevent any future problems with leaks. Leaky batteries are very hazardous, and can destroy whatever board they happen to leak upon. This often can damage a machine beyond repair. This battery had not leaked yet, but was not really holding a charge. It is a 3.6V  50mAh battery made by Yuasa from Japan, so it’s likely a quality cell, but still best to remove it. I wonder if given its small capacity I could use a super capacitor in its place.

The battery was the main reason I looked at the machine, but I remembered the MFM hard disk wasn’t spinning up. I had to test the machine anyway, to ensure it was working correctly after removing the battery. So I thought I’d try to get the drive spinning again. I tapped and banged it strategically a few times and that didn’t really help. So I rotated the stepper motor that drives the heads one step and it worked pretty much immediately. I wouldn’t normally do that given the risks, but I would have had to open the drive otherwise.

ADMAST Menu software

I rebooted the machine and MS-DOS 3.3 booted up of the hard disk without issue. Strangely it seemed to be only formatted as a 10MB disk, I had a look around the machine and found we had put a few games on it for testing. Here we see the menu screen installed on this machine called admast. Before MS-DOS 4.01 there was no shell or menu system included, so simple menu systems like this one filled the role.

This slideshow requires JavaScript.

The three games I had installed were Megapede, Nyet, and Cyrus Chess. All these games support using the MDA cards text mode for the simple graphics that they have. They also all run surprisingly well. Nyet runs pretty much the same as it does on faster machines. Megapede runs well, its speed is CPU dependent and this machine seems to be about ideal. Cyrus chess works about the same as a newer machine, minus the graphics, and it obviously takes longer to work out a good move.

I’m quite pleased to have gotten the machine working again as it would have to be the oldest machine anyone in the family owns. I’ll have to try some more software on it (if I can find any that is compatible) and see if I can get a hercules compatible graphics card. It would be cool if I could get an old version of simcity working on it.

Advertisements

0 Responses to “Some Maintenance on a Canon A-200 20HD”



  1. Leave a Comment

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s


Blogs I Follow

Enter your email address to follow this blog and receive notifications of new posts by email.


Mister G Kids

A daily comic about real stuff little kids say in school. By Matt Gajdoš

Random Battles: my life long level grind

completing every RPG, ever.

Gough's Tech Zone

Reversing the mindless enslavement of humans by technology.

Retrocosm's Vintage Computing, Tech & Scale RC Blog

Random mutterings on retro computing, old technology, some new, plus radio controlled scale modelling.

ancientelectronics

retro computing and gaming plus a little more

Retrocomputing with 90's SPARC

21st-Century computing, the hard way

lazygamereviews

MS-DOS game reviews, retro ramblings and more...

%d bloggers like this: