Eventually, [Matt] stumbled across this awesome resource for 8051 programming ... realize this 30-year-old chip has 32 IO pins. This microcontroller, along with its bigger brother the 8052 ...

The M8051 is a configurable soft-core implementation of the industry standard 8051 microcontroller that features a clock compatible twelve clocks per machine cycle architecture. This microcode-free ...

The DP8051 soft core is 100% binary-compatible with the industry standard 8051 8-bit microcontroller. There are two configurations of DP8051: Harvard, where internal data and program buses are ...