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PDP-10 Archives
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bb-x130a-sb
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cldr.pal
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/ CARD LOADER FOR PDP-8, -8/E - SRR 11 AUG 71
/ CARD FORMAT :
/ COL 1 -(WORDS TO LOAD)
/ 0 MEANS START AT ADDRESS
/ COL 2 ADDRESS OF DATA OR START
/ COL 3 CDF TO PROPER FIELD IF DATA,
/ CDF CIF TO PROPER FIELD IF START
/ COL 4 2'S COMPLIMENT OF 1'S COMPLIMENT CHECKSUM
/ COL 5 - 4 + WDS DATA IF DATA CARD
/ COL 5 + WDS CHECKSUM AFTER WORDS
/ COL 73 - 80 ARE ID AND SEQ NO.
/ CHECKSUMS ARE 1'S COMPLIMENT SUMMATION, CUMULATIVE SINCE BEGINNING
/ OF DECK, BUT ARE 2'S COMPLIMENTED SO TAD WILL GIVE 0 RESULT
NL7775=CLA CLL CMA RTL / -3 TO AC
/ CR08 & CR8-E
RCSF=6631 / SKIP ON DATA READY
RCRB=6634 / READ BINARY
RCSD=6671 / SKIP ON CARD DONE FLAG
RCSE=6672 / SELECT CARD READER AND SKIP IF READY
LBEG=7465 / BEGINNING OF LOADER
NOPUNC / SURPRESS PUNCHING OF BOOTSTRAP
*LBEG+103
/ BOOTSTRAP IS:
BOOT, RCSE / PICK A CARD
JMP .-1
BOOT1, RCSF
JMP .-1
RCRB
BOOT2, DCA CHKSUM / EVENTUALLY WRITTEN OVER WITH JMP ST
ISZ .-1
END, JMP BOOT1
*LBEG
NW,
*.+1
ADDR,
*.+1
FLD,
ENPUNC / TURN ON PUNCHING TO GET REAL LOADER
*.+1
CHKSUM, 0 / CUMULATIVE CHECKSUM FOR CARD DECK (1'S COMPLIMENT)
L, CHKSUM / INITIAL VALUES FOR LOADER AND
N, CHKSUM-END+1 / BOOTSTRAP CHECKSUM
ST, CLA
TAD RD / PUT BOOTSTRAP BACK
DCA BOOT2
CLP, TAD I L / CHECKSUM LOADER ITSELF
ISZ L
ISZ N
JMP CLP
SZA
HLT / LOADER CHECKSUM FAILURE
CD, JMS RWD / FLUSH OUT REST OF CARD
JMP .-1
RCSE / READ A CARD
JMP .-1
NL7775 / -3
DCA N
TAD C3
JMS RD / GET CONTROL INFO
TAD FLD
DCA .+1
HLT / CDF IF DATA, CDF CIF IF START
TAD NW
SNA
JMP I ADDR / ZERO IS START
DCA N
TAD ADDR
JMS RD / GET THE DATA LOADED
JMP CD / END OF CARD RETURN
/ SUBROUTINE TO READ A BLOCK AND CHECK ITS 1'S COMP CHECKSUM
RD, DCA CHKSUM / CONSTANT USED TO RESET BOOTSTRAP
DCA L
RDL1, JMS RWD
DCA I L
CLL
TAD I L
TAD CHKSUM
SZL
IAC
DCA CHKSUM
ISZ L
NOP
ISZ N
JMP RDL1
TAD C1 / CDF
RIF / SET DATA FIELD BACK TO
DCA .+1 / INSTRUCTION FIELD
HLT
JMS RWD / GET CHECKSUM
TAD CHKSUM
SZA / IS SAME ?
HLT / NO DATA WAS IN ERROR
JMP I RD
/ SUBROUTINE TO READ 1 WORD
RWD, 0422 / WORD USED TO MAKE LOADER CHECKSUM COME OUT ZERO
RWD1, RCSD / END OF CARD YET ?
JMP RWD2 / NO, CHECK DATA
ISZ RWD / YES, SKIP RETURN
JMP I RWD
RWD2, RCSF
JMP RWD1
RCRB
JMP I RWD
C1, CDF
C3, NW
/ CODE THAT OVERLAYS THE BOOTSTRAP TO GET CONTROL TO THE LOADER
BOOT, RCSE
JMP .-1
BOOT1, RCSF
JMP .-1
RCRB
BOOT2, JMP ST
CWDS=.-CHKSUM / WORDS ON CARD
CWL=110-CWDS / WORDS LEFT ON CARD
$