998x

embedded version of 9900
40 pin package; three power supplies (-5V, +5V, +12V); uses an 8-bit bidirectional data bus, so that standard memory and I/O chips, developed for 8-bit microcomputers, are easily used in 9980A systems; internally the chip is still a 16-bit microprocessor, and the 9900 instruction set is preserved; addressing capability 16 Kbytes of memory; external clock input, with an on-chip clock generator circuit; on-chip 4-phase cloc generator; up to 16K Bytes of memory

embedded version of 9900
40 pin package; 5V and +12V power supplies;  uses an 8-bit bidirectional data bus, so that standard memory and I/O chips, developed for 8-bit microcomputers, are easily used in 9981 systems; internally the chip is still a 16-bit microprocessor, and the 9900 instruction set is preserved; addressing capability 16 Kbytes of memory; uses a crystal to generate the timing; 

embedded version of 9900