Hi All,

I'm having a little trouble programming this chip using the rom loader and serial cable. Anyone been successfull with it?
I'm getting this:

DS89C420 LOADER VERSION 1.0 COPYRIGHT (C) 2000 DALLAS SEMICONDUCTOR
> L E:LOCK BITS ENABLED
> R LB:01 OCR:FF ACON:1F CKCON:01 PMR:80 P0:7D P1:FF P2:FF P3:FF FCNTL:B1
> W LB 7 > R LB:07 OCR:40 ACON:1F CKCON:01 PMR:80 P0:01 P1:FF P2:FF P3:FF FCNTL:B1 > L E:LOCK BITS ENABLED

It seems I can't unlock it with any combination. LB set to 1, 3 or 7 still gives the same error. Any ideas?

The exact part is:
DS89C420
MCS
0110AZ
191BD ES

It is an engineering sample, but I didn't see anything about this problem in the errata.

--pz