Signum only offers one type of emulators for the 8051
a debugging probe for Teridian (Maxim) devices.
The USP-51 and USP-51A in-circuit
emulators have been discontinued.
ADM-51 In-Circuit Debugger Probe
This ICD simply connects to the 8051 in the target board via a small
header, so the CPU does not have to be removed from the target board.
Non overlay memory (target memory must have RAM or Flash for code
Emulates all, but exclusively, Teridian (Maxim) 71M65XX devices
Real-time trace buffer (PC, XDATA, Ports, IRAM and SFRs)