From: jrr@flippers.com   
      
   On 2025-01-22 8:04 p.m., root wrote:   
   > John Robertson  wrote:   
   >> Hi Folks!   
   >>   
   >> Anyone have one or more of the old TI CPUs? The usual suspects don't   
   >> stock it (Unicorn, Abra, Jameco...). I have a customers game board in   
   >> where the CPU was backwards and previously destroyed...   
   >>   
   >> In case anyone is curious the game was from Japan - Universal's COSMIC   
   >> GUERILLA.   
   >>   
   >> This is NOT the TMS9918A - video chip - that some folks are trying to   
   >> emulate with Raspberry Pi(e)s.   
   >>   
   >> Thanks!   
   >>   
   >> John :-#)#   
   >   
   > I can't help source the chip, but   
   > As I remember the 9900 series were 16 bit processors.   
      
   The 9900 was a 16-bit, but the 9980 and 9981 were 8-bit, 40-pin variations.   
    From the Osbourne  book - Some Real Microprocessors (page 18-45) :   
      
   Table 18-4. A Summary of Differences Between the TMS 9900 and TMS 9980   
   Series Microprocessors   
      
   FUNCTION   
   Addressable external memory DIP pins   
   Data Bus   
   Address Bus   
   External interrupt priorities   
   CRU field width   
   Clock logic   
   /TMS 9900   
   /32,768 x 16-bit words 64   
   /16 bits   
   /15 bits   
   /15   
   /4096 bits   
   /Four external inputs   
   //TMS 9980A/TMS 9981   
   //16,384 x 8-bit words   
   //40   
   //8 bits   
   //13 bits   
   //4   
   //2048 bits   
   //One external input or internal (TMS 9981 only)   
      
   Table 18-5. A Summary of Differences Between the TMS 9980A and TMS 9981   
      
   Microprocessors   
   FUNCTION   
   Power supplies   
   Clock logic   
   Pin incompatibility ties   
   /TMS 9980A   
   /-5V. +5V. +12V   
   /One external input   
   //TMS 9981   
   //+5V. +12V   
   //One external input or crystal only   
   / & //DO - D7. INTO - INT2. /Phase3   
      
   Messy, but I can't make an ASCII table, you'll just have to imagine it   
   with the cells spaced by '/' and then '//'   
      
   John :-#)#   
   --   
   (Please post followups or tech inquiries to the USENET newsgroup)   
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