Radio Shack

• radioshack

Model: EC-425
Battery: 3 x AA nicd
Adapter: AC9130 
Year: 1974
Chip: TMS0120
Info: The EC-425 is easily identified as a close relative of the TI SR-10, as is the Montgomery Ward P300. Both calculators use the same electronics, the same layout of the keyboard and even an identical mold for the housing bottom. The different look is achieved through a new mold for the upper half of the housing, shared with the Ward P300, and a different color of the function keys.

• radioshack

Model: Spell' N 
Battery: 4 x 1,5 V type C                       
AC adapter:
Year: 1992                                
Chip:
Info:

• speak and spell line
• radioshack

Model: Spell master Radio shack 
Battery: 4 x 1,5 V type C                       
AC adapter:
Year: 1988                                 
Chip:
Info: The Radio Shack Spellmaster) was manufactured in 1988 and represents the last design iteration of the Speak & Spell family. The printed circuit board (PCB) itself is much smaller than the original Speak & Spell design.