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decus/20-0038/pdis.doc
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/******PROGRAM PDIS.PAL, 1969******
/PETER LEMKIN
/NATIONAL INSTITUTES OF HEALTH
/BETHESDA, MD. 20014
/
/
/
/INTRODUCTION:
/------------
/PDIS IS A SUBROUTINE FOR THE LINC8 COMPUTER USED TO
/ACCESS THE LINC CPU'S POINT DISPLAY HARDWARE FROM
/THE PDP8 CPU. THIS GREATLY FACILITATES INCORPORATING THE
/LINC DISPLAY IN PDP8 PROGRAMS.
/
/
/
/
/HARDWARE REQUIRED:
/------------------
/LINC8 COMPUTER WITH AT LEAST 4K OF MEMORY.
/PDIS WILL COMPILE WITH PAL.
/
/
/
/
/
/DESCRIPTION:
/----------------
/SUBROUTINE PDIS IS A POINT DISPLAY ROUTINE WHICH CAN BE
/USED FOR DISPLAYING ARBITRARY SETS OF (X,Y) COORDINATES ON
/THE LINC DISPLAY SCOPE. IT MAY BE CALLED FROM ANY FIELD. IT SHOULD
/BE NOTED THAT THE DISPLAY ROUTINE MUST BE RESIDENT IN THE PART OF
/MEMORY WHICH CORRESPONDS TO THE CURRENT LINC CPU MEMORY BANK.
/THE (X,Y)=(0,0) POSITION IS THE ENTER OF THE SCREEN. (+X,+Y)
/IS TO THE RIGHT AND UP RESPECTIVELY.
/CALLING SEQUENCE:
/ JMS PDIS
/ Y /Y COORD -Y=-377, +Y=377
/ X /X COORD -X=-377, +X=377
/ NORMAL RETURN
/&
0000 FIELD 0
4000 *4000 /CORRESPONDS TO BANK 2 IN THE LINC CPU.
6165 ISSP=6165
6141 ICON=6141
/
/
/
/
4000 0000 PDIS, 0
4001 7300 CLA CLL
4002 1600 TAD I PDIS /GET Y
4003 3253 DCA Y
4004 2200 ISZ PDIS
4005 1245 TAD PK377 /COMPUTE THE REAL X NEEDED FOR THE DISPLAY
2
4006 1600 TAD I PDIS /GET X
4007 3252 DCA X
4010 6214 RDF /SET UP RETURN
4011 1242 TAD PKCIF
4012 3237 DCA PDISEX
4013 6201 CDF 00
4014 1644 TAD I PK4010 /SAVE MEMORY
4015 3243 DCA PKSAVE
4016 2200 ISZ PDIS /SET UP RETURN
/NOW GO GET SET TO LINC UP.
/CLEAR FLAGS
4017 1246 TAD PK11
4020 6141 ICON /CLEAR LINC HANGUPS
4021 7200 CLA
4022 1241 TAD GOLINC
4023 6165 ISSP
4024 7200 CLA
4025 1247 TAD PK10 /SELECT
4026 6141 ICON
4027 1251 TAD PK2
4030 6141 MP, ICON /GO DISP
4031 7200 CLA
4032 1246 TAD PK11 /DESELECT THE LINK
4033 6141 ICON
4034 7200 CLA
4035 1243 TAD PKSAVE /RESTORE MEMORY
4036 3644 DCA I PK4010
4037 6202 PDISEX, CIF 00
4040 5600 JMP I PDIS /RETURN
/*****CONSTANTS******
4041 4054 GOLINC, LINC
4042 6202 PKCIF, CIF 00
4043 0000 PKSAVE, 0
4044 4010 PK4010, 4010
4045 0377 PK377, 377
4046 0011 PK11, 11
4047 0010 PK10, 10
4050 0007 PK7, 7
4051 0002 PK2, 2
4052 0000 X, 0
4053 0000 Y, 0
/
/
/
/
/
/SUBROUTINE LINC
/IS A LINC CODE SUBROUTINE USED TO DISPLAY 1
/POINT AT X AND Y. IT IS CALLED AND STARTED BY PDIS.
/
/&
4054 0050 LINC, 0050 /SET 10 ----- LINC CODE
4055 0052 X-4000
4056 1000 1000 /LDA IN LINC CODE
4057 0053 Y-4000
3
4060 0150 150 /DIS 10....DISPLAY CHANNEL 0
4061 0000 0000 /HLT IN LINC CODE
/RETURN TO PDP8 CPU
/CHANGE BACK MODE.
/.....................................................
$