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99 lines
4.8 KiB
99 lines
4.8 KiB
PAL20X10 PAL DESIGN SPECIFICATION
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VP4 BIRKNER/KAMZI/UDI 7/14/81
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LINES/SCROL GENERATOR
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MMI SUNNYVALE, CALIFORNIA
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CK /SWAP SCAN0 SCAN1 /INIT /SCAN3 /H255 NC /WRITE /LINE4
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/INCSCR GND /OC /SCROL0 /LINES0 /SCROL1 /LINES1 /SCROL2 /LINES2 /SCROL3
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/LINES3 /INITS /OE VCC
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LINES0 := /SWAP*/INITS*LINES0 ;HOLD
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+ SWAP*/INITS*SCROL0 ;SWAP WITH SCROL
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:+: /SWAP*/INITS*H255*/LINE4 ;INC (12 DOT LINES)
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* SCAN3*SCAN1*SCAN0
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+ /SWAP*/INITS*INCSCR ;INC (LF)
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SCROL0 := /SWAP*/INITS*SCROL0 ;HOLD
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+ SWAP*/INITS*LINES0 ;SWAP WITH LINES
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:+: /SWAP*/INITS*INCSCR ;INC (LF OR CHAR = 47)
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+ INITS ;INITIALIZE
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LINES1 := /SWAP*/INITS*LINES1 ;HOLD
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+ SWAP*/INITS*SCROL1 ;SWAP WITH SCROL
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:+: /SWAP*/INITS*H255*/LINE4 ;INC (12 DOT LINES)
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* SCAN3*SCAN1*SCAN0*LINES0
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+ /SWAP* /INITS*INCSCR*LINES0 ;INC (LF)
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SCROL1 := /SWAP*/INITS*SCROL1 ;HOLD
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+ SWAP*/INITS*LINES1 ;SWAP WITH LINES
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:+: /SWAP*/INITS*INCSCR*SCROL0 ;INC (LF OR CHAR = 47)
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+ INITS ;INITIALIZE
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LINES2 := /SWAP*/INITS*LINES2 ;HOLD
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+ SWAP*/INITS*SCROL2 ;SWAP WITH SCROL
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:+: /SWAP*/INITS*H255*/LINE4 ;INC (12 DOT LINES)
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* SCAN3*SCAN1*SCAN0
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*LINES1*LINES0
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+ /SWAP*/INITS*INCSCR ;INC (LF)
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*LINES1*LINES0
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SCROL2 := /SWAP*/INITS*SCROL2 ;HOLD
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+ SWAP*/INITS*LINES2 ;SWAP WITH LINES
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:+: /SWAP*/INITS*INCSCR*SCROL0*SCROL1 ;INC (LF OR CHAR = 47)
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+ INITS ;INITIALIZE
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LINES3 := /SWAP*/INITS*LINES3 ;HOLD
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+ SWAP*/INITS*SCROL3 ;SWAP WITH SCROL
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:+: /SWAP*/INITS*H255*/LINE4 ;INC (12 DOT LINES)
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* SCAN3*SCAN1*SCAN0
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*LINES2*LINES1*LINES0
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+ /SWAP* /INITS*INCSCR ;INC (LF)
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*LINES2*LINES1*LINES0
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SCROL3 := /SWAP*/INITS*SCROL3 ;HOLD
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+ SWAP*/INITS*LINES3 ;SWAP WITH LINES
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:+: /SWAP*/INITS*INCSCR ;INC (LF OR CHAR = 47)
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*SCROL2*SCROL1*SCROL0
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+ INITS ;INITIALIZE
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INITS := INIT*H255 ;INITIALIZATION SIGNAL
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OE := /WRITE ;ENABLE THREE STATE OF RAM
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FUNCTION TABLE
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CK SWAP SCAN3 SCAN1 SCAN0 INIT H255 WRITE LINE4 INCSCR /OC
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SCROL3 SCROL2 SCROL1 SCROL0 LINES3 LINES2 LINES1 LINES0 INITS OE
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; I
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; W L N I
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; S I H R I C N
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; W N 2 I N S / I
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; C A SCAN I 5 T E C O SCROL LINES T O
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; K P 310 T 5 E 4 R C 3210 3210 S E COMMENTS
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---------------------------------------------------------------------------
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C X XXX H H X X X L XXXX XXXX H X SET INITIALIZE BIT
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C X XXX L X X X X L HHHH LLLL L X INITIALIZE COUNTERS
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C L XXX L L X X L L HHHH LLLL L X INITS = L
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C L HHH L H X L L L HHHH LLLH L X INC LINES, HOLD SCROL
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C L HHH L H X L L L HHHH LLHL L X INC LINES, HOLD SCROL
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C L HHH L H X L L L HHHH LLHH L X INC LINES, SCAN = 11
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C L HHH L H X L L L HHHH LHLL L X INC LINES, SCAN = 11
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C L XXX L H X X H L LLLL LHLH L X INC LINES & SCROL: LF
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C L XXX L X X X H L LLLH LHHL L X INC LINES & SCROL: LF
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C L XXX L L X X L L LLLH LHHL L X HOLD LINES & SCROL
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C H XXX L L X X L L LHHL LLLH L X SWAP LINES & SCROL
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C L XXX L X X X H L LHHH LLHL L X INC LINES & SCROL
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C X XXX X X L X X L XXXX XXXX X H SET OE
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C X XXX X X H X X L XXXX XXXX X L CLEAR OE
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---------------------------------------------------------------------------
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DESCRIPTION
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"SCROL" AND "LINES" ARE COUNTERS AND POINTERS TO THE RAM. "LINES" IS A
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POINTER TO THE LINE THAT IS READ FROM THE RAM. "SCROL" IS A POINTER
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TO THE LOCATION IN THE RAM WHERE A NEW LINE CAN BE STORED. BOTH OF THEM
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COUNT UP TO A MAXIMUM OF 16 LINES.
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THE BIT "SWAP" ENABLES THE TWO COUNTERS TO TALK TO THE SAME ADDRESS LINES
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OF THE RAM.
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