Table of Contents
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Expression evaluation
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RAM
subroutines
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as
page zero storage
/ Eol 224
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Page 1
Source of INPUT 10; hi.
Current variable name.
Pointer to variable in memory 10; hi.
Pointer to variable referred to in current FOR·NEXT.
Pointer to current operator in table 10, hi.
Special mask for current operator.
Pointer to function definition 10; hi.
Pointer to a string description 10; hi.
Length of a string of above string.
Constant used by garbage collect routine.
$4C constant (6502 JMP inst).
Vector for function dispatch 10; hi.
Floating accumulator #3.
Block transfer pointer #1 10; hi.
Block transfer pointer #2 10; hi.
Floating accumulator #1. (USA function evaluated here).
Duplicate copy of sign of mantissa of FAC #1.
Counter for # of bits fo shift to normalize FAC # 1.
Floating accumulator #2.
Overflow byte for floating argument.
Duplicate copy of sign of mantissa.
Pointer to ASCII rep of FAC in conversion routine 10; hi.
CHRGOT RAM code. Gets next character from BASIC text.
CHRGOT AAM code regets current characters.
Pointer to source text 10; hi.
Next random number in storage.
Pointer to start of line of cursor loc 10; hi.
Column position of cursor.
General purpose start address indirect 10; hi.
General purpose and address direct 10; hi.
Flag for quote mode onloH.
Current file name length.
Current logical file number.
Current primary address.
Current secondary address.
Pointer to start of current tape buffer 10; hi.
Current screen line #.
Data temporary for
110.
Pointer to start loc for 0.5. 10; hi.
Pointer to current file name 10; hi.
Unused.
Overflow byte that BASIC uses when doing FAC to
ASCII conversions.
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62
byte on bottom are used for error correction in tape reads. Also, buffer for ASCII when BASIC is
expanding the FAC into a printable number. The rest of page 1 is used for storage of BASIC GaSUS and
for NEXT context and hardware stack for the machine.
A·3
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