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Elite on the BBC Micro

Tube: JMPTAB [6502SP version, I/O processor]

Name: JMPTAB [Show more] Type: Variable Category: Tube Summary: The lookup table for OSWRCH jump commands (128-147) Deep dive: 6502 Second Processor Tube communication
Context: See this variable in context in the source code References: This variable is used as follows: * USOSWRCH calls JMPTAB

Once they have finished, routines in this table should reset WRCHV to point back to USOSWRCH again by calling the PUTBACK routine with a JMP as their last instruction.
.JMPTAB EQUW USOSWRCH \ 128 (&80) 0 = Put back to USOSWRCH EQUW BEGINLIN \ 129 (&81) 1 = Begin drawing a line EQUW ADDBYT \ 130 (&82) 2 = Add line byte/draw line EQUW DOFE21 \ #DOFE21 = 131 (&83) 3 = Show energy bomb effect EQUW DOHFX \ #DOhfx = 132 (&84) 4 = Show hyperspace colours EQUW SETXC \ #SETXC = 133 (&85) 5 = Set text cursor column EQUW SETYC \ #SETYC = 134 (&86) 6 = Set text cursor row EQUW CLYNS \ #clyns = 135 (&87) 7 = Clear bottom of screen EQUW RDPARAMS \ #RDPARAMS = 136 (&88) 8 = Update dashboard EQUW ADPARAMS \ 137 (&89) 9 = Add dashboard parameter EQUW DODIALS \ #DODIALS = 138 (&8A) 10 = Show or hide dashboard EQUW DOVIAE \ #VIAE = 139 (&8B) 11 = Set 6522 System VIA IER EQUW DOBULB \ #DOBULB = 140 (&8C) 12 = Toggle dashboard bulb EQUW DOCATF \ #DOCATF = 141 (&8D) 13 = Set disc catalogue flag EQUW DOCOL \ #SETCOL = 142 (&8E) 14 = Set the current colour EQUW SETVDU19 \ #SETVDU19 = 143 (&8F) 15 = Change mode 1 palette EQUW DOSVN \ #DOsvn = 144 (&90) 16 = Set file saving flag EQUW DOBRK \ 145 (&91) 17 = Execute BRK instruction EQUW printer \ #printcode = 146 (&92) 18 = Write to printer/screen EQUW prilf \ #prilf = 147 (&93) 19 = Blank line on printer