/FLOPSY SYKES7250 SYS
/
/ OS/8 SYSTEM HANDLER FOR SYKES 7250 FLOPPY DISK
/
/FRIEDEMANN BRAUER	     SEPTEMBER 1976
/
/HNO FORSCHUNGSTRAKT
/KLINIKUM WESTEND
/SPANDAUER DAMM 130
/D-1000 BERLIN 19 , GERMANY
/
/
/MOST IDEAS FROM:
/SYKES 7100 SYSTEM HANDLER (SINGLE DRIVE , NON-BUFFERED)
/BY M PETERSON, P M HOLTHAM, I M TEMPLETON
/NAT. RESEARCH COUNCIL OF CANADA, OTTAWA K1A 0R6
/
/THIS HANDLER PACKS AND UNPACKS STORED
/DATA TO INCREASE DISK CAPACITY BY 33% -
/2 12-BIT CORE WORDS ARE COMPRESSED
/INTO 3 8-BIT DISK BYTES AS FOLLOWS:
/
/BYTE 1:	   HIGH 1  HIGH 2
/BYTE 2:	       LOW 1
/BYTE 3:	       LOW 2
/
/N B  STORAGE STARTS AT TRACK 0 SECTOR 1 OF DISK
/ALL DISK IS USED, IBM COMPATIBILITY LOST
/
/
/DEVICE CODE IS 32
/DEVICE TYPE IS 50
/
/SET BLOCK COUNT IN PIP TO 6546 (-666 DECIMAL) BY:
/	.GET SYS PIP
/	.ODT
/	13650/0000 6546
/	^C
/	.SAVE SYS PIP
/
*0	      /HEADER BLOCK
	-2
	_DEVICE SYKS;DEVICE SYS;4500;6007;0;1232
	DEVICE SYKS;DEVICE FLO;4500;FLOP2&177+5000;0;1232
	-114	   /LENGTH OF 6+6-BIT BOOTSTRAP
/
	SYOP=6321
	SYSK=6322
	SYIN=6324
/
/	BAUTO=10
/	BCOUN=7
/	BHIGH=6
/	BLOW=5
/	BCLAX=7600
/	      /
//NOW DUMMY CURRENT PAGE OPERATORS
//SINCE BOOTSTRAP WILL NOT BE IN PAGE ZERO
//
/	FIXMRI TADP=1200
/	FIXMRI DCAP=3200
/	FIXMRI JMPP=5200
/	FIXMRI JMSP=4200
/	FIXMRI ANDP=0200
//DISK RESIDENT BOOT
/	ZBLOCK 10	 / OFFSET
/BIN,	0
/	SYSK
/	JMPP .-23
/	SYIN
/BLAST, JMPP I BIN1
/	BIN1=BIN-22
/	BLAST1=BLAST-22
//SET UP CONSTANTS
/	7700	    /M100
/	7400	    /K7400
/	7605	    /A7605
/	0406	    /K406
//RE ORIGIN
/	BM100=BLAST1+1
/	BK7400=BLAST1+2
/	BA7605=BLAST1+3
/	BK406=BLAST1+4
//
/	CLA	    /ENTRY MUST BE 7421
/	TADP BCLA1
/	SYOP	    /RESET
/	LAS	    /GET X607 AGAIN FROM SWR
/	SYOP	    /"READ TRACK 0"