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All numbers on this page are hexadecimal, unless stated otherwise.
Characters are encoded according to the KOI-7 standard.
These drawings were machine generated from the ROM image.
A floating point number occupies three 16-bit words. First two words contain the 32-bit mantissa in two's complement form. The third word contains the 16-bit exponent with a bias of 0x8000. Examples:
| Number | Encoding |
|---|---|
0 1 10 100 255 1000 65535 0.5 0.125 0.1 0.001 -1 -10 -0.1 |
0000 0000 0000 0000 4000 8001 0000 5000 8004 0000 6400 8007 0000 7F80 8008 0000 7D00 800A 8000 7FFF 8010 0000 4000 8000 0000 4000 7FFE 6666 6666 7FFD 374B 4189 7FF7 0000 C000 8001 0000 B000 8004 999A 9999 7FFD |
1 word bits 15-13: identifier 000
bits 11-6: first character of the name ('A'=00, 'B'=01, ...)
bits 5-0: second character of the name (digit in ASCII)
1 word maximal first subscript in the upper byte,
maximal second subscript in the lower byte,
zero in case of a simple variable
3 words first value
3 words second value
...
3 words last value
Examples:
0600 0000 simple variable X
0000 6400 8007 value=100
0675 0000 simple variable Y5
0000 6400 8008 value=200
0440 0300 one-dimensional array DIM Q(3)
3333 B333 7FFF value Q(0)=-0.3
6666 6666 7FFC value Q(1)=0.05
0000 7FFC 800D value Q(2)=8191
0000 8004 800D value Q(3)=-8191
06B1 0102 two-dimensional array DIM Z1(1,2)
9400 7735 801E value Z1(0,0)=1E9
2F9E 44B8 7FE3 value Z1(0,1)=1E-9
6C00 88CA 801E value Z1(0,2)=-1E9
D062 BB47 7FE3 value Z1(1,0)=-1E-9
0000 4000 8010 value Z1(1,1)=32768
0000 C000 8010 value Z1(1,2)=-32768
1 word bits 15-13: identifier 001
bits 12-0: number of the line with the GOSUB statement
1 word bits 15-13: identifier 010
bits 11-0: name of the control variable
1 word address after the '=' character in the FOR statement
3 words TO value
3 words STEP value
1 word bits 15-13: identifier 011
bits 7-0: third letter of the function name (ASCII)
1 word bits 11-0: name of the function variable
1 word address of the expression