6.
Appendix of IC operation note:
The following ICs' lock status has the PSB copied in the COPY
command and verified in the VERIFY command:
AM29F010, AM29F040-old, AM29F040, AM29F002T/NT,
M29F002T/NT, MX29F8100, MX29F1610, W29C020, W29C040,
AT49F010, AT49F020, AT49F040.
(For AT49F001T and AT49F002T, the PSB will be copied, but not
verified)
The following ICs have the capability of Temporary Sector Unprotect
feature, allows code changes in previously locked sectors. This feature
can be enabled by setting the PSB byte to value $FF.
AM29F080, AM29F016, AM29F100, AM29F200, AM29F400,
AM29LV400, AM29F800, AM29LV800, AM29LV160.
16bit devices:
16bit EPROM operation on the PROM8908D/E/F
The PROM8908 was originally designed to handle the 8bit chips. For
EPROM with 16bit structure only, you need using an adapter and
programming it in a special way: You have to do every operation twice,
one on the low byte(D0..D7) and the other on the high byte(D8..D15).
A complete process will be:
1.
Set both DIP switches(totally 16) on the adapter to the same
direction. This will connect half of the 16bit bus onto the terminal pin
and open the other half to make them pulled up. Then you treat this chip
just like 8bit device and operate the programmer in the usual way.
2.
After the first half part of the chip has been done, you switch all
DIP switches to the other side to process another half in the same way.
3.
Only both steps work successfully, the process is completed.
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