Datasheet legend
Ab/c: Fractions calculation
AC: Alternating current
BaseN: Number base calculations
Card: Magnetic card storage
Cmem: Continuous memory
Cond: Conditional execution
Const: Scientific constants
Cplx: Complex number arithmetic
DC: Direct current
Eqlib: Equation library
Exp: Exponential/logarithmic functions
Fin: Financial functions
Grph: Graphing capability
Hyp: Hyperbolic functions
Ind: Indirect addressing
Intg: Numerical integration
Jump: Unconditional jump (GOTO)
Lbl: Program labels
LCD: Liquid Crystal Display
LED: Light-Emitting Diode
Li-ion: Lithium-ion rechargeable battery
Lreg: Linear regression (2-variable statistics)
mA: Milliamperes of current
Mtrx: Matrix support
NiCd: Nickel-Cadmium rechargeable battery
NiMH: Nickel-metal-hydrite rechargeable battery
Prnt: Printer
RTC: Real-time clock
Sdev: Standard deviation (1-variable statistics)
Solv: Equation solver
Subr: Subroutine call capability
Symb: Symbolic computing
Tape: Magnetic tape storage
Trig: Trigonometric functions
Units: Unit conversions
VAC: Volts AC
VDC: Volts DC
Years of production: 1975-? Display type: 7-segment
New price:  
Display color: Green
    Display technology: Vacuum fluorescent display
Size: 7"×4"×2½" Display size: 8 digits
    Entry method: Calculator arithmetic
Batteries: 8×"AA" (Internal NiCd) Advanced functions: N/A
External power: AC adapter Memory functions: N/A
I/O: N/A    
    Programming model: N/A
Precision: 8 digits Program functions: N/A
Memories: N/A
Program display: N/A
Program memory: N/A
Program editing: N/A
Chipset:   Forensic result:  

b3-08.jpg (27240 bytes)I don't really have this peculiar calculator in my collection; however, I had it briefly in my possession, while I made an attempt to bring it back to life at the request of Andrew Davie, curator of that wonderful Internet resource, the Museum of Soviet Calculators.

Unfortunately, my attempts to repair this machine were not successful. Someone has already used this beast as a chip mine; several chips were missing, desoldered from the main circuit board. However, I was able to get at least some signs of life from the device; when I powered it up, the DC-DC converter came to life, the heating wires inside its vacuum fluorescent tubes began to glow faintly, and occasionally, a single segment in its error indicator became lit.

While taking this machine apart, I photographed its internal components.

The first picture shows the insides of the machine with the back panel removed. Towards the top (which would be underneath the display) the discrete components of the machine's DC-DC converter can be seen, including what I believe to be some germanium power transistors! (I could be wrong, I only measured the parameters of these transistors in-circuit.)

The second picture shows most of the guts of the calculator. Its two circuit boards have been opened up flat; on the picture, the board on the bottom is actually the backside of the keyboard, while the board on the top is the main CPU board. The eight display tubes, plus the ninth tube which is installed sideways and serves as an error indicator, can be easily seen. Also seen are the places where several small chips are missing (although in these relatively low-resolution JPEG images the gaps may not be obvious.)

The third picture is very similar; however, by this time the display tubes have been separated from the metal enclosure that also houses the DC-DC converter beneath.

The fourth picture shows the backside of the DC-DC converter circuit panel. This side can be seen only after the housing that contains this circuit and the display tubes has been disassembled.

Lastly, the fifth picture shows the DC-DC converter from the component side, without being obstructed by the main circuit board.

Inside and outside, the B3-08 reeks Sharp to me. This is a machine very similar to some of the early Sharp calculators, including the EL-8M that is in my possession.