Dataman 48UXP - Manual (Page 30)

This option is used to select a new device as the active device. It is
important to select the correct device, as the algorithms used to
program devices are device-specific. The following screen will
appear:
Figure 4.1 Screen for selecting Change Device
Special note in device package and its selection
In the above screen, you can find both AT89C51 and
AT89C51*44 selections, the AT89C51 means this is a 40 pin
DIP chip, no adapter request and 89C51*44 means the chip is
44 pin PLCC or QFP/TQFP, after select the 89C51*44, in the
bottom of the software screen will display chip information and
the adapter requirement. In this example, it shows
SDP-UNIV-44 as recommend adapter, it means for 44 PLCC
chip, you need the 44 pin PLCC universal adapter, if your chip
is 44 QFP or TQFP, you will need a 44 QFP (SDP-UNIV-44TQ)
or 44 TQFP (SDP-UNIV-44TQ) adapter.
If you have a 3
rd
party 44 PLCC adapter that swap the 44 pin PLCC
chip into a 40 pin DIP chip (emulated the 44 PLCC as 40 pin DIP),
you can select the 89C51 in software selection and using this 3
rd