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In November 1971, Intel introduces its 4-bit bus, 108-KHz 4004 chip - the first microprocessor.
The documentation manuals were written by Adam Osborne.
In march of 1980, at the West Coast Computer Faire, Adam Osborne approaches
Lee Felsenstein with the idea of starting a computer company.
In january 1981, Osborne Computer Corporation is incorporated.
In april 1981, Adam Osborne, of Osborne Computer Corporation, introduces the Osborne 1 Personal Business Computer at the West Coast Computer Faire. It features a Z80A CPU, 5-inch display, 64KB RAM, keyboard, keypad, modem,
and two 5.25-inch 100KB disk drives for US$1795.
It also includes US$1500 worth of software, including CP/M, BASIC, WordStar, and SuperCalc.
Osborne anticipated selling 10,000 in total, but sales quickly reached 10,000 in a single month.
In september 1981, Osborne Computer Company has its first US$1 million sales month.
In september 1983, Osborne Computer Corp. files for Chapter 11 bankruptcy protection.
|SIZE measured with case closed
20.5 inches wide
14.5 inches deep
8.5 inches high
26.2 lbs (shipping weight 34 lbs.)
Leather handle for carrying
When closed, unit is weather resistant
Unit sized to fit under standard airline seat
120 volt detachable power cord stows within case with cover secured
High impact plastic case meet UL 94VO flame retardance specifications
120 volts AC 50-60 hz
37 watts maximum
Configurable to 220 AC 50-60 hz
Switching power supply
Convection cooled; no fan
Maximum operating ambient air temperature 85 degrees F
Humidity - 95% relative, non-condensing
Minimum operating air temperature 32 degrees F
4K byte memory-mapped display memory in top page of main memory
9 bit wide display memory-7 bit ASCII plus underline and half-intensity attributes
Scrolling performed by hardware in vertical and horizontal directions
Solid underline cursor
White video on dark background
24 lines of 52 characters visible
32 lines of 128 characters video memory over which window may be moved
10 scan lines per character line
Cursor on lowest scan
96 upper and lower case characters
32 graphics characters
Size of video area 3.55" horiz. 2.63" vert.
Linearity 10% adjacent characters, 15% overall
64 microseconds per scan
16.666 milliseconds per vertical sweep
12 microseconds horizontal blanking
1.28 milliseconds vertical blanking
Three-wire grounded power plug
Fuse integral to AC receptacle
Thermal cutoff opens when internal temperature exceeds 150 degrees F (resets at 130 degrees F)
Power supply shuts off under overload conditions
69-key detachable keyboard, full-travel sloped keytops includes 12-key numeric keypad
Power on-off switch in rear
Reset pushbutton on front panel
Brightness and contrast controls on front panel
MAIN PC BOARD
Processor-Z80A, 4MHz CPU clock
Memory size-64K bytes programmable (RAM)
4K read-only memory bank-switched
60K of programmable memory available for software
PROGRAM EXECUTION SPEED
Program in read-only memory executes without delay
Programmable memory adds average delay times as follows:
First Ml cycle-188 nsec
Subsequent consecutive Ml cycles-0 sec
Non-Ml cycles-375 nsec
1200 or 300 baud, selectable in software
DTR (pin20) handshaking input to control transmission data
Modem-9 pin plug for use with external DCE type modem
Adapter allows connection of modem and printer simultaneously
IEEE-488 (General Purpose Instrumentation Bus) Controller only, talker and listener
Keyboard-connects to keyboard through detachable cable
External video-drives non-composite TTL video monitor supplied as option (same format as 24X52)
Battery adapter-allows operation with external battery pack
5.25 inch diskettes, single sided, soft sectored
Storage provided for 30 diskettes max
40 tracks per diskette
10 sectors per track
256 bytes per sector
Max. seek time 20 milliseconds track-to-track
Rotation time 200 milliseconds
Controller type 1793
28538 Danti Court
Hayward, California 94545