MBO SC-40

Serial number	947443, made in Hong Kong.
Accessories	Pouch
Condition	Cosmetically ok, functionally poor: Display segments 5 and 4 don't work at and and number of keys have serious contact problems, ie. 0 and =. Small cracks in the housing at the top right side.
Repairs, Comments	20.2.2004 Removed a completely corroded accu pack and rewired the unit a bit so that it can be used with a regular power supply. Picture of opened unit.
Acquired	15.2.2004

Type, Precision, Input mode	Scientific, 10 BCD digits, exponent ±99, Algebraic
Programmable	No
Memory	1 storage register, not permanent.
Display	12 digit 7 segment red LED
Hardware	Chipset MCS2525 and MCS2526 (MOS)
Special features	Instructions on the back.
Original Pricing, Production	Introduced 1974 and sold for 279 DM (approx. 140 Euro).
Batteries	Built-in 4xAA accu pack (removed) or external DC 6V off-the-shelf power supply.
Dimensions	Length 17.2cm, Width 8.7cm, Height 4.1cm
Links	Compmuseum, Iser.
Comment	A pretty impressive unit! Apparently, there was a black unit as well, see here. The sequence "= M" stores data in memory and "M" after any other key recalls the memory contents.