... /STEP7820A2ASCPU-S1CPU, BUILT IN 14KSTEPS RAM, MAX. I/O 1024, 0.2us/STEP9390A2USHCPU-S1CPU, BUILT IN ... 30KSTEPS RAM, MAX. I/O 1024, 0.09us/STEP9390A2ASCPU-S60CPU, BUILT IN ... 30KSTEPS RAM, MAX. I/O 1024, 0.15us/STEP20140A1SCPUC24-R2CPU, BUILT IN ... MAX. I/O 256, 5 I/O SLOTS3940A1SJHCPU-S8CPU, BUILT IN 8KSTEPS RAM, MAX. I/O 256, 8 I/O ...