Speak & Spell Compact

There are 3 28-pin SDIPs on the PCB: CD8011A-NL DBS 8240 PHILIPPINES, TMC0281NL MDU ^8236, and CD2354A-NL MDX 8236 PHILIPPINES (a VSM).

CD8011 is a TMS1100B microcontroller. The die is labeled CD8011A.

CD8011 die top metal

CD8011 die with top metal removed

CD8011 ROM array

CD8011 raw ROM dump

CD8011 ROM dump

TMC0281NL is a voice synthesis processor. The die is labeled T0280F 0281D.

TMC0281 die top metal

TMC0281 die with top metal removed

The keyboard has 36 buttons in a 10x4 matrix. It is connected to the CD8011 MCU.

       K1        K2   K4   K8
R0   letter      A    J    S
     stumper
     
R1   ------      B    K    T

R2   review      C    L    U

R3   repeat      D    M    V

R4   erase       E    N    W

R5   module      F    O    X

R6     go        G    P    Y

R7   enter       H    Q    Z

R8   ------      I    R    '

VSS  on/spell   ---  ---  Off

Speak & Spell Compact info from Datamath