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PROGRAMMING AUXILIARY MEMORY 7.3
Table 8.1
Soft switches
Switch Location Function
Name Hex Decimal
------ ----- ------- ----------------------------------
RAMRD $C013 49171 Read RAMRD switch
$C002 49154 OFF: Read Main 48K ($0200—$BFFF)
$COO3 49155 ON: Read Aux. 48K
RAMWRT $C014 49172 Read RAMWRT switch
$CD04 49156 OFF: Write to Main 48K
$C005 49157 ON: Write to Aux. 48K
ALTZP $C016 49174 Read ALTZP switch
$C008 49160 OFF: Use Main memory, Page 0. stack
bank—switched (16K) memory
$C009 49161 ON: Use Aux. memory. Page 0, stack
bank—awitched memory
80STORE $C018 49176 Read 80STORE switch
$C000 49152 OFF: Enable RAMRD, RANWRT switches
for video pages
$C001 49153 ON Override RAMRD, RAMWRT switches
for video pages (use PAGE2 switch)
80COL $CD1F 49183 Read 8OCOL switch
$COOC 49163 OFF: Display 40—colunma
$COOD 49164 ON : Display 80—columns
TEXT $CO1A 49178 Read TEXT switch
$C050 49232 OFF: Display graphics
$C051 49233 ON: Display text
MIXED $CO1B 49179 Read MIXED switch
$C052 49234 OFF: Full graphics
$C053 49235 ON: Mixed text and graphics
PAGE2 $CO1C 49180 Read PAGE2 switch
$C054 49236 OFF: 1. Display video page 1 using
RAMRD.RAMWRT (80STORE off)
2. Display video page 1 using
main memory (8OSTORE on)
$C055 49237 ON : 1. Display video page 2 using
RAMRD, RANWRT (80STORE off)
2. Display video page 1 using
AUX. memory (80STORE on)
HIRES $C01D 49181 Read HIRES switch
$C056 49238 OFF: Low—res graphics selected
$C057 49239 ON: Hi—res graphics selected
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