pcjs/disks/pcx86/dos/ibm/1.00

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page	PC-DOS 1.00	/disks/pcx86/dos/ibm/1.00/	/disks/pc/dos/ibm/1.00/	type id config autoMount pcx86 ibm5150-pcdos100 /devices/pcx86/machine/5150/mda/64kb/machine.xml A path /disks/pcx86/dos/ibm/1.00/PCDOS100.json

PC-DOS 1.00

The PCjs machine below is running PC-DOS 1.00.

{% include machine.html id="ibm5150-pcdos100" %}

PC-DOS 1.00 was completed in August 1981 and announced at an IBM press conference on August 12, 1981, when IBM introduced the original IBM PC (Model 5150).

PC-DOS 1.00 was released on one single-sided (160Kb) diskette. A complete listing of all the files is shown below.

Directory of PC-DOS 1.00 Diskette

IBMBIO    COM        1920  07-23-81
IBMDOS    COM        6400  08-13-81
COMMAND   COM        3231  08-04-81
FORMAT    COM        2560  08-04-81
CHKDSK    COM        1395  08-04-81
SYS       COM         896  08-04-81
DISKCOPY  COM        1216  08-04-81
DISKCOMP  COM        1124  08-04-81
COMP      COM        1620  08-04-81
DATE      COM         252  08-04-81
TIME      COM         250  08-04-81
MODE      COM         860  08-04-81
EDLIN     COM        2392  08-04-81
DEBUG     COM        6049  08-04-81
LINK      EXE       43264  08-04-81
BASIC     COM       10880  08-04-81
BASICA    COM       16256  08-04-81
ART       BAS        1920  08-04-81
SAMPLES   BAS        2432  08-04-81
MORTGAGE  BAS        6272  08-04-81
COLORBAR  BAS        1536  08-04-81
BUG       BAS         640  08-04-81
CALENDAR  BAS        3840  08-04-81
MUSIC     BAS        4224  08-04-81
DONKEY    BAS        3584  08-04-81
BLUE      BAS        1152  08-04-81
HUMOR     BAS         640  08-04-81
POP       BAS         768  08-04-81
FORTY     BAS         768  08-04-81
DANDY     BAS         640  08-04-81
MARCH     BAS         768  08-04-81
STARS     BAS         768  08-04-81
HAT       BAS         768  08-04-81
SCALES    BAS         640  08-04-81
SAKURA    BAS         512  08-04-81
CIRCLE    BAS        1664  08-04-81
PIECHART  BAS        2304  08-04-81
SPACE     BAS        1920  08-04-81
BALL      BAS        2048  08-04-81
COMM      BAS        4352  08-04-81

CHKDSK reports:

          40 disk files
      160256 bytes total disk space
        6144 bytes remain available

Additional Information From PC DOS Retro

• distributed on 1 160KB floppy disk
• initial release (equivalent to 86-DOS 1.14)
• released with the IBM PC
• PC DOS system files are IBMBIO.COM and IBMDOS.COM, command shell is COMMAND.COM
• executable file formats are .COM and .EXE
• single-sided 160KB floppy disk support (FAT12)
• directory entries only include the date last written
• file attributes read-only (01h), hidden (02h) and system (04h) supported
• batch files (.BAT) and AUTOEXEC.BAT
• internal commands: COPY, DIR, ERASE, PAUSE, REM, RENAME, TYPE
• external commands: CHKDSK, COMP (PC DOS), DATE, DEBUG, DISKCOMP, DISKCOPY, EDLIN, FORMAT, LINK, MODE, SYS, TIME
• external commands: BASIC, BASICA (PC DOS only)
• special device names: AUX, COM1, CON, LPT1, NUL, PRN
• program loading and execution implemented in COMMAND.COM
• PSP created for each executed program
• files are opened with FCBs
• DPB structures are used for internal drive info
• INT 20h terminate program
• INT 21h DOS API functions 00h-2Dh (18h, 1Ch-20h unused)
• INT 22h termination address
• INT 23h control break handler address
• INT 24h critical error handler address
• INT 25h absolute disk read (implemented in IBMBIO.COM)
• INT 26h absolute disk write (implemented in IBMBIO.COM)
• INT 27h terminate and stay resident (implemented in COMMAND.COM)
• CP/M CALL 0 interface (executes INT 20h)
• CP/M CALL 5 interface supporting INT 21h functions 00h-24h

See PC-DOS 1.00 Documentation for more information.