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165 lines
8.5 KiB
165 lines
8.5 KiB
PAL20X10 PAL DESIGN SPECIFICATION
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VP2 BIRKNER/KAMZI/UDI 7/9/81
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CHAR/CURS GENERATOR
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MMI SUNNYVALE, CALIFORNIA
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CK /DTCNT0 /DTCNT1 /DTCNT2 /INITS /SWAPC /CHAR0 /CURS0 /BS /WRITE /INCSCR GND
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/OC /CURS1 /CHAR1 /CURS2 /CHAR2 /CURS3 /CHAR3 /CURS4 /CHAR4 /CURS5 /CHAR5 VCC
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CHAR1 := SWAPC*/INITS*CURS1 ;SWAP WITH CURS
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+ /SWAPC*/INITS*DTCNT0*DTCNT1*DTCNT2*CHAR0 ;INC
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:+:/SWAPC*/INITS*CHAR1 ;HOLD
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CHAR2 := SWAPC*/INITS*CURS2 ;SWAP WITH CURS
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+ /SWAPC*/INITS*DTCNT0*DTCNT1*DTCNT2 ;INC
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* CHAR0*CHAR1
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:+:/SWAPC*/INITS*CHAR2 ;HOLD
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CHAR3 := SWAPC*/INITS*CURS3 ;SWAP WITH CURS
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+ /SWAPC*/INITS*DTCNT0*DTCNT1*DTCNT2 ;INC
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* CHAR0*CHAR1*CHAR2
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:+:/SWAPC*/INITS*CHAR3 ;HOLD
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CHAR4 := SWAPC*/INITS*CURS4 ;SWAP WITH CURS
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+ /SWAPC*/INITS*DTCNT0*DTCNT1*DTCNT2 ;INC
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* CHAR0*CHAR1*CHAR2*CHAR3
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:+:/SWAPC*/INITS*CHAR4 ;HOLD
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CHAR5 := SWAPC*/INITS/CURS5 ;SWAP WITH CURS
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+ /SWAPC*/INITS*DTCNT0*DTCNT1*DTCNT2 ;INC
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* CHAR0*CHAR1*CHAR2*CHAR3*CHAR4
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:+:/SWAPC*/INITS*CHAR5 ;HOLD
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CURS1 := SWAPC*/INITS*/INCSCR*CHAR1 ;SWAP WITH CHAR
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+ /SWAPC*/INITS*/INCSCR*CURS1 ;HOLD
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:+:/SWAPC*/INITS*/INCSCR ;INC
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* WRITE* DTCNT2*DTCNT1*/DTCNT0*CURS0
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CURS2 := SWAPC*/INITS*/INCSCR*CHAR2 ;SWAP WITH CHAR
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+ /SWAPC*/INITS*/INCSCR*CURS2 ;HOLD
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:+:/SWAPC*/INITS*/INCSCR ;INC
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* WRITE* DTCNT2*DTCNT1*/DTCNT0
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* CURS0* CURS1
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CURS3 := SWAPC*/INITS*/INCSCR*CHAR3 ;SWAP WITH CHAR
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+ /SWAPC*/INITS*/INCSCR*CURS3 ;HOLD
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:+:/SWAPC*/INITS*/INCSCR ;INC
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* WRITE* DTCNT2*DTCNT1*/DTCNT0
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* CURS0* CURS1*CURS2
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CURS4 := SWAPC*/INITS*/INCSCR*CHAR4 ;SWAP WITH CHAR
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+ /SWAPC*/INITS*/INCSCR*CURS4 ;HOLD
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:+:/SWAPC*/INITS*/INCSCR ;INC
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* WRITE* DTCNT2*DTCNT1*/DTCNT0
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* CURS0* CURS1*CURS2*CURS3
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CURS5 := SWAPC*/INITS*/INCSCR*CHAR5 ;SWAP WITH CHAR
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+ /SWAPC*/INITS*/INCSCR*CURS5 ;HOLD
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:+:/SWAPC*/INITS*/INCSCR ;INC
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* WRITE* DTCNT2*DTCNT1*/DTCNT0
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* CURS0* CURS1*CURS2*CURS3*CURS4
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FUNCTION TABLE
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CK DTCNT2 DTCNT1 DTCNT0 INITS SWAPC BS WRITE INCSCR /OC CURS5 CURS4
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CURS3 CURS2 CURS1 CURS0 CHAR5 CHAR4 CHAR3 CHAR2 CHAR1 CHAR0
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; I
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; I S W N
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; N W R C
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; I A I S /
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; C DTCNT T P B T C O CURS CHAR
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; K 210 S C S E R C 54321 0 54321 0 COMMENTS
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---------------------------------------------------------------------
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C XXX H X X X X L LLLLL L LLLLL L INITIALIZE CHAR AND CURS
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C LLL L L X X L L LLLLL L LLLLL H INCREMENT CHAR, HOLD CURS
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C LLH L L X X L L LLLLL L LLLLL H HOLD CHAR AND CURS
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C LHL L L X X L L LLLLL L LLLLL H HOLD CHAR AND CURS
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C LHH L L X X L L LLLLL L LLLLL H HOLD CHAR AND CURS
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C HLL L L X X L L LLLLL L LLLLL H HOLD CHAR AND CURS
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C HLH L L X X L L LLLLL L LLLLL H HOLD CHAR AND CURS
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C HHL L L X X L L LLLLL L LLLLL H HOLD CHAR AND CURS
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C HHH L L X X L L LLLLL L LLLLH H INCREMENT CHAR
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C LLL L L X X L L LLLLL L LLLLH L HOLD CHAR AND CURS
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C LLH L L X X L L LLLLL L LLLLH L HOLD CHAR AND CURS
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C HHH L L X X L L LLLLL L LLLLH L INCREMENT CHAR
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C LLL L L X X L L LLLLL L LLLLH H CHAR = 3
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C LLH L L X X L L LLLLL L LLLLH H HOLD CHAR AND CURS
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C LHL L L X X L L LLLLL L LLLLH H HOLD CHAR AND CURS
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C LHH L H X X L L LLLLH H LLLLL L SWAP CHAR AND CURS
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C HLL L L X X L L LLLLH H LLLLL H SET CHAR0
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C HHH L L X X L L LLLLH H LLLLH H INCREMENT CHAR TO 3
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C HHH L L X X L L LLLLH H LLLHL H INCREMENT CHAR, HOLD CURS
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C LLL L L X X L L LLLLH H LLLHL L CHAR = 4
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C HHL L L X L L L LLLLH H LLLHL L HOLD CHAR AND CURS
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C HHH L L X X L L LLLLH H LLLHL L INCREMENT CHAR
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C LLL L L X X L L LLLLH H LLLHL H CHAR = 5
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C HHH L L X X L L LLLLH H LLLHH H INCREMENT CHAR
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C LLL L L X X L L LLLLH H LLLHH L CHAR = 6
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C LLL L L X X L L LLLLH H LLLHH H CHAR = 7
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C HHH L L X X L L LLLLH H LLHLL H INCREMENT CHAR
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C HHH L L X X L L LLLLH H LLHLL L CHAR = 8
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C HHH L L X X L L LLLLH H LLHLH H INCREMENT CHAR TO 11
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C LLL L L X X L L LLLLH H LLHLH H CHAR = 11
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C HHH L L X X L L LLLLH H LLHHL H SET CHAR0, INC CHAR BY 2
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C HHH L L X X L L LLLLH H LLHHH H CHAR = 15
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C HHH L L X X L L LLLLH H LHLLL H CHAR = 17
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C HHL L L X H L L LLLHL H LHLLL H INCREMENT CURS
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C HHH L L X X L L LLLHL L LHLLH H CHAR = 19, CURS = 4
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C HHL L L X H L L LLLHH H LHLLH H CURS = 7
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C HHH L L X X L L LLLHH H LHLHL H CHAR = 21
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C HHL L L X H L L LLHLL H LHLHL H CURS = 9
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C HHH L L X X L L LLHLL H LHLHH H CHAR = 23
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C HHL L L X H L L LLHLH H LHLHH H CURS = 11
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C HHH L L X X L L LLHLH H LHHLL H CHAR = 23
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C HHL L L X H L L LLHHL H LHHLL H CURS = 13
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C HHH L L X X L L LLHHL H LHHLH H CHAR = 27
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C HHL L L X H L L LLHHH H LHHLH H CURS = 15
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C HHH L L X X L L LLHHH H LHHHL H CHAR = 29
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C HHH L L X X L L LLHHH H LHHHH H CHAR = 31
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C HHH L L X X L L LLHHH H HLLLL H CHAR = 33
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C HHH L L X X L L LLHHH H HLLLH H CHAR = 35
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C HHH L L X X L L LLHHH H HLLHL H CHAR = 37
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C HHH L L X X L L LLHHH H HLLHH H CHAR = 39
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C HHH L L X X L L LLHHH H HLHLL H CHAR = 41
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C HHH L L X X L L LLHHH H HLHLH H CHAR = 43
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C HHH L L X X L L LLHHH H HLHHL H CHAR = 45
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C HHH L L X X L L LLHHH H HLHHH H CHAR = 47
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C HHH L L X X L L LLHHH H HHLLL H CHAR = 49
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C HHH L L X X L L LLHHH H HHLLH H CHAR = 51
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C HHH L L X X L L LLHHH H HHLHL H CHAR = 53
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C HHH L L X X L L LLHHH H HHLHH H CHAR = 55
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C HHH L L X X L L LLHHH H HHHLL H CHAR = 57
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C HHH L L X X L L LLHHH H HHHLH H CHAR = 59
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C HHH L L X X L L LLHHH H HHHHL H CHAR = 61
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C HHH L L X X L L LLHHH H HHHHH H CHAR = 63
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C LLL L L X X L L LLHHH H HHHHH H CHAR = 63, DTCNT = 0
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C LLH L L X X L L LLHHH H HHHHH H CHAR = 63, DTCNT = 1
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C LHL L L X X L L LLHHH H HHHHH H CHAR = 63, DTCNT = 2
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C LHH L L X X L L LLHHH H HHHHH H CHAR = 63, DTCNT = 3
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C HLL L L X X L L LLHHH H HHHHH H CHAR = 63, DTCNT = 4
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C HLH L L X X L L LLHHH H HHHHH H CHAR = 63, DTCNT = 5
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C HHL L L X H L L LHLLL H HHHHH H INCREMENT CURS
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C HHH L L X X L L LHLLL L LLLLL H CURS = 14, INCREMENT CHAR
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C HHH L L X X L L LHLLL L LLLLL L CURS = 14, CHAR = 0
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----------------------------------------------------------------------
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DESCRIPTION
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"CHAR" AND "CURS" COUNT THE NUMBER OF CHARACTERS PER LINE. THEY ARE ALSO USED
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AS POINTERS TO THE RAM. "CURS" IS USED WHEN A CHARACTER IS WRITTEN INTO THE
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RAM AND "CHAR" WHEN A CHARACTER IS READ FROM THE RAM. "CURS" IS ALWAYS
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POINTED TO THE NEXT AVAILABLE LOCATION IN THE RAM WHERE A NEW CHARACTER
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CAN BE STORED.
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"CHAR" IS INCREMENTED AT THE END OF 8 PIXELS MEANING IT COUNTS AFTER EACH
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CHARACTER. IT COUNTS FROM 0 TO 63 ALTHOUGH ONLY 48 CHARACTERS ARE VISIBLE.
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THE HORIZONTAL SYNC PULSE IS GIVEN BETWEEN ECHARACTERS 56 AND 59. DURING
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THE COUNTS OF CHAR FROM 48 TO 63, BLACK SIGNALS ARE TRANSMITTED TO THE SCREEN.
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"CURS" IS INCREMENTED FOR ANY OPERATION ONT THE KEY BPARD. THE TWO POINTERS
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USE THE RAM IN THE INTERLIVED FASHION. READ IS DONE EVERY CYCLE, BUT WRITE
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IS DONE ONLY WHEN A WRITE SIGNAL IS GIVEN. THE WRITE SIGNAL IS SET
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WHEN A NEW CHARACTER ENTERS THE SYSTEM THROUGH THE RS232 PORT.
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THE FUNCTION TABLE ABOVE DESCRIBES OPERATIONS OF READ AND WRITE FOR A
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CERTAIN LINE. WHEN THIS LINE WAS PRINTED, 64 CHARACTERS WHERE READ AND
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15 CHARACTERS WERE WRITTEN.
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SIGNALS CHAR0, CURS0, SWAPC, WRITE AND INCSCR ARE DERIVED IN PAL VP8.
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