/OS/8 HANDLER TO EMULATE SYKES 7250 FLOPPY DISK ON LSI-11

//

A
DEATFP MDOURA. B,XAYPSS E K#9 909B051 2 LBU1J  Y,769
15

/
O/
LNRIN, BOB SCHOR	JULY, 1978

//

/


USED IN CONJUNCTION WITH LSI-11 RUNNING "SYKES", WHICH CAUSES PDP-11

TAO/EP  AP TR BOYKES DISK, AND TO WRITE SYKES-FORMAT FLOPPY FILE
S



R/TS/NRAESFII VP  AAREALIL ELTANF RETCEEBEPW -NP DLD8NSAL1 -II S1 TNIHM LH

//

T
NFIREECHACA REATSCICRI-T 
S-

/
S/
1K	=1P1 		66K	1 IS IPPPF -DAF8IGLHS HI /
G
U
P1	1 T=6	1	6	N2EAS TD PC -OP,D1O1LR EPWP-8 FLAG

	TG/	1E6=141 R	6EE	EICR V OFPPM1-DN 1 TI,AOO CRWLGIEL N
AF

G/T

/
HE INTERFACE HAS ONLY ONE FLAG FOR EACH DEVICE, SO NCYRONOUS I/O I
S
O/
PTNSO LIS EBO .VWH,EEY RHNSNRCSOO/ UCOI A  BNCAEPOCSLMDHIU,ENS TGI
H C
E/C
NTOPFEOM "T S"ARNEA"  ADL"SEEVVICE.


	
//S
ARMEATWS	TOIFT  NRAERFFS MROLRSE V
A.
/		WHEN FLAG IS RAISED, MEANS SLAVE HAS DATA TO SEN
D
S/
VL	TEANR	ESA RFTDSTAAASTER.

/W	
NH	L E AF IGIRSDSAM,ENE MSATA  ESSHRC APCADTEF ERFOGIE/
N
/


MASTER CAN "VOLUNTARILY" BECOME SLAVE BY WAITINGR OLAG, BUT NOT

/CA
TECGIPA N,TDU AITBEM ADMLTISYETW ICI NH TGASO VLASESTTN UDDANO 
I
IGFT/SRRTS NRAE
F.
/SLAVE CAN "DEMAND" TO BASTER BY SENDING ANY DATA, THEN WAITING FO
R
L/
 AFIWG CHGSHLNITSATH E AYWNE-LTMD EOL"DEASH"V A TDSTAASO DE 
N

./
/NEEDLETS SAY, BOTH MASTER AND SLAVE HAVE TO BE SYNCHRONIZED--

T H/SMERTAU E SMOKTWWNNH O EG TRNITEO H E"ENMD DAOF"TMR H ASE VLIWE
CHS
HNI/SAGH LCETNH  GA OEASFSTT/
U
/


IF THE PDP-8 "START" SWITCH IS PRESSED, ITS FLAG GETS LOWERED AND THE

/PP
1-DL 1 AFTGGRSEED.  HENCE THE DEFAULT INITIALIZATION IS PDP-
8
A/
ESM RTPP,1-DL 1EAS .VSM OTOTF  H ATEFNRSESR RDEAEO N NH IOETOP TSP
I
EESE/SWNIT, THE PDP-11 AS MASTER, SO THAT AFTER BOTH PROGRAMS EXIT, THE

/PP
1-DE 1IMR NASMSRTA .EET D H1PPP1-GR MROS AEY" SKPE"TEXTSCHA  THE PDP-
8
S/
A IESMWRTNH T ES II ITRFA SELC DLDA,E NNMD DASMSRTAT EUASFST O SIRFET
L
H.SL/UIO AD ETRYLDEABA ME T S,IRHWT LSLRISULT IN ITS IGNORING THE FIRST

/MC
NMOFDAMR H OPET-D  8PIW, CH IHWASSAL  YE"ATSR "EIW, CHYMHE AA BLFS
E
GYIR/O NDEEHITFT STRME.

//

/


SYKES DISK CONVENTIONS -
-



D/P8/-OPW  D RF O2T1I(B BSS,M0S L1   B) 1SOITDSESRA  AI AOP BR EFT
YS
/	BYTE 1		BITS  2  3  4  5  6  7

	TB/2EYB	 SI	 	T  8 19 10  1  ?  ?
 ?

?/C

/
OMMANDS -
-
7/
06	E	0TSRC,EAL ORE U TITFENEARR CEE( TSFSSRE POINTERS)

/X	
TX4CR	SKATE/,OCE R/ARIWD TRMCENMOPDARA A IAL( YWNSSITEPN RA 
SI	
)/S
	D0NEERI/E CETVYPB-REI/A

	603	TERMINATE I OUPUTTING PARTIAL BUFFER ON WRITE


P
//T
OORC-O 
L-

/
A/
LNH EDRFR SISITSUSR EEE",TSH " ETNSN DEOTSO WSRWF DR OKATE/COCSNFTRMATIO
N
4/
	X	ATX CRMNKRBU  E X=1&X,7 R 7 OF70M(6-CD AIE
LM	
)/Y
YE4SO	TNC BRM URYE &= 7Y3F  M,O-R1  6E2DM(I)CL/A

		READ/WRITEYY & 40 (0 = READ, 40 = WRITE)

/RF
V OYEED R8PPO - RW ODTDFTAABO TE NR ESAERFTDROO FR MR Y OSKSP E-D()1P
1
D,P8/-NPII TEIT A REQUEST BY SENDING A NULL (0) WORD.  TWO BYTES ARE THEN

TNR/ESAERFTDROO FR MR D OEE(IRTDNMY EH BRETDE R/AEIWI T TBET)E HCVD
.I
BOE/ RFIEENTXFGIMR H OHETDA RLNA,ET  ME"AIR"TNS EE I.NS/
T
/




/IT
HSHDA RLNS EN IRTICFE EA TD/OOB8S"Y IB "LU .DSI T TCRSE CONFORMS TO THE

DCE/PRSOTIINITN  H /OEH8SDA OBN KOAC,EPH2RT", IB "LUE DICS.OT/
N
/


IN ADDITION TO USING BUILD TO ADD THE HAED TO THE SYSTEM, WE MUST TELL PIP

H O/NMWBYACL  KOEASN RH ODETIE ,CVS EO AOLF:WL/
S
G
. 	TSEYISP
 P
/	.ODT

/3	
561X/5 XX6
X/WHERE 55 (136NN) IS THE DEVICE TYPE, 7046 = -476 (DECIMAL) BLOCKS

//

/




/TI
FENEARO CDTIIE TNFNII
O

S/
	SKP11= 6161	/SKIPP-8 FLAG HIG
H
U	
1TP6=121 S	6DE/C NO AD T1PP
-
E1G1	16T 4=6R1/D	AREF  MPOD1P1N-I  O
TC
A
/

MCI/LESEALSONE UNFDIIISOT/
NXF
IMID	R=XIS 		ZIN/	XDIN ERSITUTNICC,ONO  TUTWSUHISTOPK 	
I
X
IIFRXME		TJI  =P M /I	B0UUSONRIET TEI/X



//

	


EJECT


ER/BLOCK FOR HANDLER


	
//	
N -NN	 B=M UR EFNOAEHL DS RNLII
FE
/	DEVICE	XXXX	TWO-WORD GROUP NAME (6-BIT ASCII)

/E	CVDYEIYY	O-WORD DEVICE NAME (6-BIT ASCII)

	BD/D	CIE	 CVNCEOTOBLRCL 
O
	K	T/I B01  I=F-	ERLTTSCEUR
UD
/		BITS 3-8 = 55	DEVICE TYP
E
E/
RN	FFSET	OFFSET OF HANDLER ENTRY FROM START OF PAGE

/		
A	0 SLOTTO WSRWL DYWAZSAOE /
R


0
	
/

*
	

0/
	-1		/1 HANDLER

		S
11	/GROUP NAME

DIE		CV1DED	XIE/ CVMNE
A
5E4		0F5/E	LTISC-URRU,TDEEDC I5V 
E5
	SYKES-200	/ENTRY OFFSET

		0
L/	YWAZSA0E 	
R
	
	A0S ZERO

//

/


MAIN BODY OF HANDLER


H
//D
NRAEAL  SELRADCESLAO FO L LS
W-	-
/
JMS I	ENTRY

	NF/LTC/	RNF	ICU OTNCNORO

/		
I/	0TB   F0= O PIR,UN  TRF1U OUTO
P
	T	B//S	T-I1=  U5NE BOM 1R -F8R2ORW ODCSEDORTR TS NRAE/F

			/BITS 6-8 = MEMORY FIELDR ORANSFE
R
B/
FU		EFB	RFU/ EFDARSRD
E
BS	C/O	L	TKST/RGANLIBK CUONE B
MR
/	JMP	ERR	/ERROR RETURN LOCATION

	.(/	..N	)MO/ ARURN, I/O COMPLETE


*
/	0
0/2



/ O
TEN,RNE YPTGAA TMRSEER R OFEUM
S

R/
SYKES,	0		/ENTRY POIN
T
L	
CAC
L R
L		
FBD/L	IRU UDT ENERTRFCTION

T	A	I(DCFC
D D
F		
ANCTFRISC/E	VOAFR  URT
ENTR
	
AD	K7600	/ISSUE "RESET" TO DEVICE

	SJ
O	M	1TE/1 NS TDPPO1-DTA1 I	SYKES	/GET FUNCTION WORD

	AD
E	C	MTA/P VS
IEI
T		
XKDY
SSTE
	
AD I	SYKES	/GET BUFFER ADDRESS

	AD
U	CTFB/RPVS	PEANO RTI	
E
X
DEI

//

/
SBO C8ONL BKMSURREAC  VENTOR EDTENSI EOKTY CSASR/TKC ERMOURNEAB FS LSLSOW-O-/ 



/CE
OHA8S L /KOBS C5 IW62DO LNR, EACH SYKES SECTOR IS 128 BYTES LON
G
I/
ENSA C CEPPH -DRW8TDOEA TSK W TBO,EYH SEETR R4EAE  OCS RTRPSS E /OOB8
CLB
K/C
ONL BKMSU START FROM 0, TRACK AND SECTOR NUMBERS FROM 
1
A/
 CEATH CRSHK2 A2 3D6(IE LMCS)ATE SOC/
R
U
H
TS
/	TRACK	= (BLOCK * 4)/32 + /	SECTOR	= MOD (BLOCK * 4, 32) + 
1



I/DS/INVOIIW  L LECBCPAMSOIDLEYHBE RA EDPEUTSR TTBCNAO/I



	AD
R	CKATI	CTN/LIIEIAU ZIOQTETDT
	 AKSI	EYE/SBTGCL CKONO 
U
LTCR	 	LL*T/
	4I 
	
DX	TRACK	/INCREMENT QUOTIENT FIRS
T
A	
(DT2-	S	3TU/CRBDTAII RSV	
O
A
M/SCK	FOR NEGATIVE

	PJ
-	M/3.OL	
O
APT(		0D0243	+1A+M /ECKERSOOTCA M
MDDN
	
CA	SECTOR

	XI
Y	DSKS/
E
/


NOTE THAT TRACK AND SECTOR NOWRM TO THE ABOVE CONVENTION, WITH THE

/DA
IID OT ON04FO 0E TOCSTRTMO EA T KH IAETRP ROPTIPCEAMO DAM/
N
/


NOW PROCESS FTNON WOR
D



A/TT		PDMRE/R	TVEEFI CENOUI
TN
	RAL		/* 2 TRANSFORMS IT TO WORD COUNT, R/W BIT TO LIN
K
N	
KDA07	/06VS	OEAYN O L RWUTDBIT
S
Z	
	ASK/	 IS IP WF0=CF, LU I-LDEFE L
ARC
D		
AMI/E	K A-O W (DURO)CT	N

DCA	WDCNT	/AND SAV
E
A	
TDTPE	R	MRE/VITFEECU 
N
N	
KDA	7	A/0 VSEFE LITBD
I
AST(		FDDBC/L	ICU  DF DOTTABD FAF
URDE
	
CA	TEMP	/SAVE AND EXECUT
E
MT
	PEFC,/	DTS	U EEFBFRFLI 
E

D/T
IS POINT, SET-UP IS FINISHE
D
A/
LNH EDTRRNUEN R)O(S WO IR TRREO OTIP/
N
/


START ACTUAL I/O BY ISSUING TRACK AND SECTCO MANDS


T
/		
DAAR	TKECGT/ CTA
RK
	TAD	(400	/MAKE COMMAND

J	M	1TS/1ONS	TDEDO IE 
CVS
E		
LLZ/K	NTISL LAIHR   SWT/I0B  ,=A E R,WDITE

	DT
4	A/0KKM	WEATR CEIMO DAMF NI I NLTSK	
E
D
AETSO	T/C	IRU BDCLERSOOTCA M
MDJN
	
MS	TO11	/SEND TO DEVICE


D
//P
S IO READ OR WRITE BLOCK
S



N/SC	 	LASL/P	IOKTR WE T	I

JMP	READ	/GO READ


C
//E
MEOH  E ROITR WEOTLSBKNCOE DC I
VE
/TRANSFERS BIRE TO DEVIC
E



I/R,WEATTI	 UDBT	P/F	TREOGW  DORRBF FMF
URJE
	
MS	BYTEIT	/BREAK UP INTO BYTES AND SEND BYTE TO DEVICE

			/BRING LINK, BIT 8 OF PDP-8 WORD, INTO A
C
M	
BSJEY		ITE/T NSCSDDOEY N
TBI
E		
XFDURBTBP/P	MUUBE FPF NRIROEKT

40,	40		/CONSTA DUMMY "AND"

	AC
/	LEC	SALC RFCA O XNRTTEEI 	
M
Z
SDIWT	NCC/N	UWO DTR
OS
	JMP	WRITE	/AND LOOP


C
//E
MEOH  E ROITXFE MTOARER 

Q
/ST
ITU		,D0A6/(	S3S IERUENTIEMT	A

JMS	TO11	/SEND TO DEVICE

	XI
Y	DSKSB	EPU/A M SPRET ORTRRNUEK
R
7
711		,7C7/S	NNOA T,MTUADD"

TINR	FCTH,/	LTS	N ERSITUTNICI ODEF	
L
I
XSE	ETK/Y	DSNEARR U
TN

/



U/SO/RIBT UE NOCTIAP RKAWP DTRROF  MPOD P8T-NTI
S
O/
TTR EAT4SRO HI  TGNS, DEWLS EOB8RSI /
T



BYTEIT,	0

	RR
/	TTR	EAO  TGR4
HIR
T	
RDT
	
CA	TEMP	/SAVE TEMPORARIL
Y
A	
TDTPE	DM73	K	7PE/N EBEOEY  'TRWS
TOJ
H		
S1MO/T	N1ETS DD IOV
EETC
	
AD	TEMP	/RESTORE A
C
X	
	IETBTTEYA	I N/IED TXTW,LHIKI N NADAOTATED 4 TIMES




//C

/
OME HERE TO READ BLOCKS FROM DEVICE


P
//T
OORCIO TL SS DONUEN  LTLYTB RE UOQTESAED, AETDN A"M SDARMESTUS"

/CA
TECY P-TBIPE RAET,BNHOE  MCL"EEASA"VIG 
A

N/
READ,	JMS	TO11	/SEND NULL BYTE TO REQUEST DATA, STATUS SWITC
H
U	
		PDEMAND MASTER STATUS

J	M	OFS1MRG	1 E/BATEY 	
T
D
N3A(		7E7K /PBE S8T	I

CLL RTL		/MOVE THEM U
P
T	
	LRO/	O T8PTD  8PPI -
TBD
S	E
P	/AND SAVE

J	M	OFS1MRG	1 E/CSTDOEY N
TBR
E		
RST/V	ODH NEWNOI  OWTO LRBE S4T	I

RTR

	DA
1	N/7(LO	KYNPE O ERWL  ETB4
TID	TEMP	/COMBINE WITH UPPER 
8
C	
IADU	 TFB/RPDA	A N
VSI
E		
XFDURBTBP/P	MUUBE FPF NRIROEKT

70,	70		/CONSTANT, DUMMY "AND"

	SJ
ATM1	/NOW WAIT FOR 11 TO BECOME MASTER AGAIN

I	S	CWZ	NDO/TTUCO NSRW	
D
P
MEJR		DNAAL/ PDO	O

JMP	SQUIT	/TERMINATE AT END OFOCK

//

/


SUBROUTINES FOR PDP-11 COMMUNICATION

//

1
OST D1NAE TS 1C  O,I1A,WSETRR U TSTNIAW CH ACE L,NRIUL HKCGNN
AD
E
/

O,1T1U		1TE/	 NS AD TC
1OJ
1		
SIMA1W1WT/T	IOAF1  TR A1 EOC
CT7P
K
600,	7600		/CLEAR, ALSO USEFUL CONSTANT

	IE
TTX1O	R	1UE/ AT CLEAR, LINK UNCHANGE
D



R/F1/MWO T1IFA  SR,O1H1T  NCECTAPAE OSW
 D
R
/

R1OF	1M
,
M0JW		TSI	A1A1W /TRIO1F1O TE S
 DGN
	
ET11		HE WOR
D
X	
	IEOFT1MRR	1UE/ RTTWNWHIDO N RC I/
A
/


WAIT11 WAITS FOR 11 FLAG TO COME UP

IPF/-D  1P I1SMSRTAM,ENE 1SAHS ACCEPTED PDP-8'S OFFERIN
G
F/
D I8PPS -A IESM RTAM, NE 1SSH1F ARFOGIEO NPRF-D T8PAO EC 
PC

T/R

/
OUTINE MAINTAINS AC AND LINK, LEICHECKING KEYBOARD FOR CTRL 
C
F/
R IBOT LUCRESUET,R H YKEABE ROURDNTOCEI A  BNIEENMLEAIBDT
 
EYRA/LNPI"C PGM+J.  " 2TIAA1W+2 WITH "JMP .-1"


A
/W1
T	I,
10
	SKP11		/CHECK FLA
G
M	
.PJ	+	K/2 IS IPTNFE OYARC,DCH KKE
B E
D	T
IAXW1	T/I	I1XWE NTE1H1L F  GMAUPC
D	C	MTACPES	AEA/C VU ANRDKGI B ECD
CHK
K		
BRR/D	ABEK
 D
	AND	K177	/KEEP ASCII

	DT
2	A-0(/30EC	 CHRFK  OC=3LT 
 RA
CK1
7	/MASK OFF CARRIE
S
N	
CAS	L S	APK/F IO ICTNLT 
 RJ
C		
P3M+J./ 	P MFRITCC 	L

TAD	TEMPAC	/RESTORE A
C
M	
WPJTA	+1I/11NC	NTO UITIE
G



O/C /ERMEOH CE LNR,TCE RR UTT ON 8O//S



	FC
I D0FCG		TO/OO 8S 	
/
I
XKE	0T6/7	W0O!N!/!



/T

C
A	R,	K	R1TK/CRA	0		/SECTOR

UTFB	RP	0,U/	EFBPRFNO RTIW
E
N
C	D,	T	O0W /DURO
CTEN
T
MPAC,	0		/TEMPORARILY HOLDS AC DURIND KBD REA
D




//

/
$$
$