Did you know the 2nd bathch of Spice calculators are more accurate?

[brouhaha]

The Spice models included a 1024x10 ROM, and the LED anode and cathod drivers, in their CPU chips, providing a cost reduction compared to the Woodstock series. The CPU ROM was intended to be common code shared by multiple calculator models, so there are only three main CPU versions rather than eight. The CPU ROMs mostly contain the arithmetic and transcendental function microcode.

1820-2105 (optional -A or -B suffix, also may be referenced as 00031-80003 or 1MA4-0001) was used in the 31E, 33E, and 33C.

1820-2122 (optional -A suffix, also may be referenced as 00037-80001 or 1MA4-0002) was used in the 37E and 38E.

1820-2162 (optional -A suffix, also may be referenced as 00032-80001 or 1MA4-0003) was used in the 32E, 34C, and 38C.

Improvements to the accuracy would most likely have been in the 1820-2162, thus affecting the 32E, 34C, and 38C.

I have not determined whether there are any code differences between corresponding no-suffix, -A suffix, and -B suffix parts.