I open this thread just to share a curiosity.
I only knew Amstrad and Tatung as systems that used the Hitachi 3-inch format.
But I was surprised to find this ad in Byte magazine from March 1983 ( https://archive.org/details/byte-magazine-1983-03-rescan/page/n60/mode/2up?view=theater (https://archive.org/details/byte-magazine-1983-03-rescan/page/n60/mode/2up?view=theater) ) announcing a three-inch drive for the IBM PC.
Pages from 1983_03_BYTE_08-03_Mass_Storage.jpg
The Sega SC3000 had a companion unit with a 3" drive.
On the silly side of things, you can connect a FD-1 disk drive to a Dragon disk controller and it will work :)
The Spectrum +3 would be another notable example (although that's basically Amstrad again)
Though people forget that back in the early to mid 80s the choice of disk drive wasn't really as clear cut. It was really IBM "blessing" the 3.5" format, by including it on their PCs, that subsequently led to it's dominance and making most of the other variations obsolete.
Check out this beauty for the Famicom. The engraved brand was tested by the disk drive, to ensure it was an original disk.
The company Amdek made a dual 3in Disk drive for the Atari XL/XE too.
Bryce.
The drive is boasting 1 megabyte unformatted capacity. That must be across two disks surely?
"unformatted capacity" is a marketing con, the value is entirely unverifiable (after all, you can't use the disc until it's formatted) and therefore essentially meaningless.
As I know first was Yamaha with FDD for own MSX, and Yamaha Midi keyboard with build 3" FDD.
I can't find picture. :(
Sega SF-7000 for Sega SC-3000, it Master System + more RAM & ROM with Basic.
(https://segaretro.org/images/thumb/b/be/SF-7000_1.jpg/320px-SF-7000_1.jpg)(https://encrypted-tbn0.gstatic.com/images?q=tbn:ANd9GcQBTqik0Pviy-qwtXMtJy-MBbnTP_wQm7a4pj2IBt58PXZe4jyTnjzqZV9CFh1vAcwJ1WQ)
Timex FDD 3000, could work as seperate CPM terminal with keyboard, or as FDD for Timex and Spectrum computers. There was no rubber belt. Two drives version only.
(https://timex.comboios.info/Timex/tt3000system.jpg)
(https://encrypted-tbn0.gstatic.com/images?q=tbn:ANd9GcTmOjTnME_Ns_Mr6JEd7nQkdLtkALgb0cfqKUgJ4aZG2F2zmvKuVihohQav4kCikfIBt4Q)
Or little cheaper version FDD3, with only one drive and less RAM, no CPM option.
(https://oldcraporg.files.wordpress.com/2021/11/dsc_0080.jpeg?strip=info&w=500)
Unipolbrit 2086 with huge FDD 3". size like old 1541 for C64. It has two ports for Kempston Joystick.
Timex and Unipolbrit had 164K per side with catalogs, later version 640K per disc.
(https://www.blog-wajkomp.pl/wp-content/uploads/2019/02/Unipolbrit_2086_zestaw_2-wiki-300x225.jpg)
Bosman 8, CPM with 512K, and one 5.25" drive option, or two 3" drives, on picture.
(https://encrypted-tbn0.gstatic.com/images?q=tbn:ANd9GcSIY-vEui8iG8wzfiPnEeyrOb2whW1Diw30gw)
Tatung Einstein TC1 and 256, with Power Supply inside monitor before Amstrad CPC.
(https://upload.wikimedia.org/wikipedia/commons/thumb/1/1a/Tatung-einstein-computer.png/271px-Tatung-einstein-computer.png)(http://www.starringthecomputer.com/computers/tatung_einstein_256.jpg)
Oric Atmos and two kind 3" FDD, Jasmin and Oric Microdisc.
(https://encrypted-tbn0.gstatic.com/images?q=tbn:ANd9GcSjpZj94kdPwu899aOylHGFdPC3q1GfT_UGPg)(https://upload.wikimedia.org/wikipedia/commons/thumb/7/78/Jasmin_I.jpg/320px-Jasmin_I.jpg)(https://upload.wikimedia.org/wikipedia/commons/thumb/4/4c/Microdisc.jpg/279px-Microdisc.jpg)
Amdek with Amdisk III (1 or 2 drive version), (180K or 720K drives), with interface for many different computers those times like IBM PC, Tandy TRS-80 and CoCo, AppleII, Atari 800/XL, Thomson...
http://www.trs-80.org/img/amdisk3.jpg
(https://www.retroadv.it/images/amdek/amdisk_1.jpg)
(https://bytecellar.com/wp-content/uploads/2019/02/tr-computer-early80s-3-inch.jpg)
(https://pbs.twimg.com/media/DhXOKOAU8AAQU6N.jpg)
And all of them before Amstrad with CPC, PCW and ZX+3. :)
@ZbyniuR I think that you have listed all of them. 8)
About the SC-3000, it is a SC-1000 hardware, not Master System.
Some of the early sampled electric pianos used 3" discs to hold the samples IIRC, but I think they quickly moved to 3.5" discs.
Quote from: robcfg on 19:50, 23 February 22The Sega SC3000 had a companion unit with a 3" drive.
On the silly side of things, you can connect a FD-1 disk drive to a Dragon disk controller and it will work :)
I think Shugart was standardised in the 70s when people were shifting from 8" discs to 5.25" discs, but now I've written that I wonder if it was actually earlier as I think most 8" drives (if you can actually find one) will work with a controller like the 765.
Then again, it's hard to get a much simpler interface. The only important pins for any drive are:
MOTOR control (out)
TRACK step (out) and direction (out), track 0 sense (in)
READ data (in)
WRITE enable (out) and data (out)
SENSE for the optical detector that marked the start of the track (in)
Some systems like Apple ][ needed motor speed control too. But they were the exception.
The hole sense was optional on the Amiga because by then, they'd realised they could detect the start of track from just the sync markers at the start of each sector and read the entire track and just write out an entire track at once and not care where it started.
:)
If I count it well 8 different producers with 3" drives for 18 different computers before Amstrad use it in 1984. And in those time only 2 producers used 3.5" drive: Sony for SMC and MSX, Apple for Lisa and Mac.
One year later Amstrad use 3" for CPC and PCW, that 9 producers for 20 computers.
Meantime 3.5" choose Atari for ST and C= for Amiga.
So, which one standard were more popular in 1985?
But Yamaha admitted, Sony standard is selling better. All others 3" user (but Amstrad) were losers. In 1987 IBM use 3.5" for PS/2 systems. And Mac, ST and A500 were selling well. That was end. PCW in 1991 start use 3.5", year later last ZX+3 and CPC+ gone away from factory.
RIP my dear 3" drives. After Windows 3 in 1992, 3.5" become more popular than 5.25". And now sad hymn with trumpet.
The problem is that around 1985 the storage capacity on 3.5in drives started rising sharply and no-one tried to increase the capacity on 3in drives, so it was destined to die out. The size difference wasn't significant enough to give it any advantage above 3.5in.
Bryce.
Early Mac and ST drive had 1 head. MSX use this all the time. Before Amiga start 880K wasn't so big difference.
I recall Roland Perry was annoyed by the rumour that Amstrad went with 3" drives because they got a lot of them for cheap. Since Amstrad were going to need MILLIONS of drives, and you don't make important supply chain decisions like that because you got a good deal on a single batch.
As he said, there was just no way to know back in 1984 what format was going to come out on top.
Quote from: Anthony Flack on 07:00, 20 September 23I recall Roland Perry was annoyed by the rumour that Amstrad went with 3" drives because they got a lot of them for cheap. Since Amstrad were going to need MILLIONS of drives, and you don't make important supply chain decisions like that because you got a good deal on a single batch.
As he said, there was just no way to know back in 1984 what format was going to come out on top.
Indeed. He answered that question on Facebook one or two years ago. I put a screenshot somewhere here on the forum.
Plus: they did make a great deal. If I remember correctly, the contract ensured that the manufacturer builds 3" drives and discs for as long as the CPC range is built AND each drive must cost less than a 3.5" drive would cost. (I wouldn't be surprised that this was part of the reason that they introduced the Plus 6128 to ensure the supply of drives and discs for their PCW range)
I can see why he was annoyed. The story suggests that Amstrad were like some two-bit garage operation when in reality they were manufacturing on a huge scale.