Atari 1050

==> Atari 1050 --- a 5.25" floppy disk drive
Same as the 810, plus Dual-Density capability. Two modes of operation:
1) Single-Sided, Single-Density, 90K, 810 compatible
2) Single-Sided, Dual-Density, otherwise known as "Enhanced Density" because
it is not true double-density--
MFM 40 tracks x 26 sectors/track x 128 bytes/sector = 128K capacity
19.2Kbps transfer rate. 288RPM
The 1050 includes a 6507 microprocessor.
Shipped with DOS 2.0S, DOS 3, or DOS 2.5
DIP switches: Black & white left: Drive 1
Black right, white left: Drive 2
Black left, white right: Drive 3
Black & white right: Drive 4
Third-party upgrades for the 1050 (all add a true SSDD 180K capability):
US Doubler (ICD) SS SD/ED/DD UltraSpeed (US) 54Kbps, sector skewing
Happy 1050 SS SD/ED/DD Warp Speed 52Kbps, 36 sector buffer,
(Happy Computers) Happy Backup. also read/write 180K 5.25" MS-DOS floppies
I.S. Plate (Innovated Software) SS SD/ED/DD Ultra/Warp (USD/Happy clone)
Hyper Drive (Chaos! Computers) SS SD/ED/DD Warp Speed 52Kbps (Happy clone)
Super Archiver (CSS) SS SD/ED/DD UltraSpeed 54Kbps (US Doubler clone)
Super Archiver II(CSS)SS SD/ED/DD UltraSpeed 54Kbps (US Doubler clone)
Cheer-Up 1050 SS SD/ED/DD Warp Speed 52Kbps (Happy clone)
Speedy 1050 SS SD/ED/DD Warp Speed 57Kbps (Happy clone), 8kb buffer,
(Compy-Shop, now ABBUC) DOS, copier, track & density displays, beep speaker
Mini-Speedy same as Speedy 1050, but without displays & speaker
Super Speedy 1050 SS SD/ED/DD Warp Speed 96,000Baud (Happy clone),192K RAM
SuperMax 1050 SS SD/ED/DD UltraSpeed 52Kbps (US Doubler clone)
Lazer 1050 SS SD/ED/DD Warp Speed and UltraSpeed 54Kbps
Engl-Turbo-1050 SS SD/ED/DD Turbo Speed approx. 70,000 Baud (uses
(german Turbo) Sector skewing that differs from USDoubler)
1050 Duplicator (Duplicating Technologies (DT))
SS SD/ED/DD "read 18 sectors in the time normally for 1"
sources(Jim Patchell)http://www.oldcrows.net/~patchell/atari/duplicator.html
Klone ???????

Rich Mier professes:
You've been plugging and unplugging the SIO cable with the 1050 power pack
plugged in, right? That's a no-no. Most of the time it's Okay, but about 1
in 10, 20 times, it will blow out 'U-1'. It's a CA/LM 3086 I.C. at the right,
rear of the main board. A 14 pin DIL chip. Actually it is an array of 5
transistors.

Unplug the power pack from the 1050, then unplug the SIO cable. Power can be
ON on the CPU. The problem has to do with the secondary winding of the Power
Pack. Remember, the problem only occurs 1 out of 10 - 20 times that you do
it, not all the time.

It doesn't really matter if the 1050 Transformer has power on or off, it
'Might' happen if plugged into the 1050. It is really bad on 810's.

One thing, if the system has been turned off for, oh say, 5 - 10 minutes it
won't matter. By then all the capacitors should be bled(sc?) to 0 volts.