spell master 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.

ec 4000Model: EC-4000
Battery: BP6 , BP7
Adapter: AC9131 , AC9132
Year: 1979
Chip: TMC1501          
Info: The Radio Shack EC-4000 does not only look like an early TI-57 Programmable, it's 100% identical.





r spell math radio shackModel: Spell' N 
Battery: 4 x 1,5 V type C
                       
AC adapter:
Year: 1992
                                
Chip:

Info:

kosmos 2 radioModel: Kosmos 2 radio shack
Battery: 2 x AA
Adapter: 
Year: 1979
Chip:  TMC1172NL          
Info: Same version of the kosmos 2, but with the radio brand shack, 
Kosmos International, Inc. based in Atlanta, Georgia introduced with the Kosmos 1 already in the year 1977 a pocket-sized biorhythm calculator.On a first glance you notice the original calculator keypad and the three „sine-waves“ representing our:

• Physical Cycle (P)
• Emotional Cycle (S)
• Intellectual Cycle (I)

This Kosmos 2 was introduced in 1979 as the successor of the original design and obviously was the result of some cost reduction programs: 

• The 6 red and amber LED's at the end of the three "sine-waves" were omitted
• The housing feels much cheaper
• Manufacturing was moved from Japan to Taiwan