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General Category => Other retro => Topic started by: 00WReX on 08:50, 19 January 14

Title: Tandy CoCO Amdisk !
Post by: 00WReX on 08:50, 19 January 14
As a fan of the Tandy Color Computer series (CoCo 1,2,&3), I was looking through and early
edition of the HOT CoCo magazine (July 1983) and found an interesting advertisement...

It was for a dual 3" drive called an Amdisk of all things...


 [ You are not allowed to view attachments ]

(click to enlarge)

I have never seen or heard of one and would expect they would go for a small fortune if one
came up today.

Cheers,
Shane
Title: Re: Tandy CoCO Amdisk !
Post by: 00WReX on 09:29, 19 January 14
Looks like this company also made them available for a few computers of the time (US based).

The Amdek Amdisk-III (http://www.trs-80.org/amdek-amdisk-iii/)

Amdek Amdisk I | Applefritter (http://www.applefritter.com/node/133)

http://www.atarimagazines.com/compute/issue46/040_1_REVIEWS_AMDC_3-Inch_Disk_Drives_For_Atari.php (http://www.atarimagazines.com/compute/issue46/040_1_REVIEWS_AMDC_3-Inch_Disk_Drives_For_Atari.php)

Cheers,
Shane
Title: Re: Tandy CoCO Amdisk !
Post by: Gryzor on 12:33, 19 January 14
How interesting... Of course let's keep in mind that 3" drives/disks were not Amstrad's inventions, so they're bound to have come up for various systems...
Title: Re: Tandy CoCO Amdisk !
Post by: fgbrain on 23:04, 19 January 14
Did you notice "624 kb per disk" is twice the size of the AMSDOS format ?
This must be an 80 track drive..?!
Title: Re: Tandy CoCO Amdisk !
Post by: Bryce on 23:12, 19 January 14
I mentioned these drives a while back. There's some info and links here: Wanted: CF2 disk drive ASAP (http://www.cpcwiki.eu/forum/classifieds/wanted-cf2-disk-drive-asap/msg65433/#msg65433)

Bryce.
Title: Re: Tandy CoCO Amdisk !
Post by: 00WReX on 04:40, 20 January 14
I mentioned these drives a while back. There's some info and links here: Wanted: CF2 disk drive ASAP (http://www.cpcwiki.eu/forum/classifieds/wanted-cf2-disk-drive-asap/msg65433/#msg65433)

Bryce.


Bryce, That's almost identical info...I don't remember seeing your post (although it looks like I've copied it  :D ).
The Amdisk 3 for the CoCo actually looks neat with the dual drive setup.


Did you notice "624 kb per disk" is twice the size of the AMSDOS format ?
This must be an 80 track drive..?!


That size is for both disk's combined I'm assuming.

so 624kb divided by 4 disk sides = 156kb.

This is very close to what we get on the CPC with an IBM format.

IBM: 160k single-sided. 40 tracks of eight 512-byte sectors each. Sectors numbered &01 to &08. Provided for compatibility with CP/M-86 (and DR-DOS 1.0). Used by very few CPC purchasers, but Locomotive Software stated that this was invaluable for cross-assembly. The useable capacity is 158k.


Disc format - CPCWiki (http://www.cpcwiki.eu/index.php/Disc_format)

Cheers,
Shane
Title: Re: Tandy CoCO Amdisk !
Post by: Bryce on 10:16, 20 January 14
Yes, they certainly weren't 624K per disk. It was the usual advertisers twisting the facts to make it look as good as possible. I've only ever once seen one of these (back in the 90's) and it was connected to an Atari 800XL as far as I can remember.

Bryce.
Title: Re: Tandy CoCO Amdisk !
Post by: Gryzor on 19:42, 20 January 14
Well, it wasn't really an advertising twist; it says "624K system" pointing at the entire unit, akeen to the "xxxKB/MB online storage" they also used.
Title: Re: Tandy CoCO Amdisk !
Post by: fgbrain on 23:18, 20 January 14

No, it has double density 80track mode!! Read the review..
Quote
If you connect an 80-track, double-density, double-sided drive to the system using DOS/XL, you can get 736K.
Title: Re: Tandy CoCO Amdisk !
Post by: TFM on 00:03, 21 January 14
Yes, as the Joyce hat 0.7 MB format on its 3" drives too.

Title: Re: Tandy CoCO Amdisk !
Post by: MacDeath on 00:55, 21 January 14
Quote
HOT CoCo magazine
then have a hot Coco post :
(http://ioneglobalgrind.files.wordpress.com/2013/08/coco-main_1683086a9311.jpg?w=620&h=932)

I've read those "Coco" had quite a nice success in USA, is that true ? got some "modern" games on those ?

Quote
624 kb
bits or bytes ? that's why we used the octet in France.
Title: Re: Tandy CoCO Amdisk !
Post by: Bryce on 11:08, 21 January 14
Thanks MacDeath, for making a perfectly innocent Retro forum NSFW! :D

Bryce.
Title: Re: Tandy CoCO Amdisk !
Post by: MacDeath on 22:23, 21 January 14
I don't care, I can't consult this forum at work.


Promotion !!!
(http://i3.kym-cdn.com/entries/icons/facebook/000/001/424/Promotion.jpg)
 ;D


Promotions | Know Your Meme (http://knowyourmeme.com/memes/promotions)

Title: Re: Tandy CoCO Amdisk !
Post by: Gryzor on 19:06, 07 February 14
Time I put an age restriction in the registration process... :D