 |
ELEKTRONIKA
B3-21 |
|
The first Russian
pocket programmable calculator
Year: 1977 .. 1981 ..
Power: 4 x D0.55 NiCd accumulators or adapter
Display: Red LED (early variant), fluorescent (later
variant)
Price: 350 r. (1977-79),
190 r. (1980,81), 80 roubles (1981)
Features: RPN, programmable (60 steps), early models contain
error: 9.9999999 + 10 = 120
Modifications: LED display (early) and
fluorescent (later).
There are four known calculator steps for display and error correction (see table)
| Modification |
Display |
Errors |
| I |
LED |
1, 2, 3 |
| II |
LED |
2, 3 |
| III |
VFD |
2, 3 |
| IV |
VFD |
none |
Errors:
1. 9.9999999 [enter] 10 [+] (result = 120).
An unchecked overflow ņauses when addition of number, which contain in a mantissa seven
digits "9", and number with exponent greater then first number.
2. 2 [P] [cos] [P] [rotate ring stack right
(below ",")] (result = error)
When executing transcendent functions and x^y, one of register of ring stack is corruped.
3. Subroutine call will not performed if a
cell with jump address have location at addresses {55, 65, 70, 80, 91 or 92}, and also
when execute operator, which have code # is equal with this jump address.
Video file: Program
run on the B3-21 (4.5 MB).
| More images (click on image): |
 |
 |
 |
| Large image |
Large image |
Large
image |
 |
 |
 |
| Display |
Back label |
Back
label |
 |
 |
 |
| Large image |
Large image |
Large
image |
 |
 |
 |
| Manual |
Large image |
Large
image |
 |
|
|
| LED display |
|
|
|
