Dear Members,
1. Not so long ago,it was probably Kai who cautioned
about possibile existence of secret actual programming
parameters,not public,exchanged only between
'microcontroller manufacturer'and the 'approved
programmer manufacturer'.
2. Respected Peter Averill of Victoria TAFE University
mentioned about failure of 'his' old AT89C2051
programmer after running successfuly for 11/2 years.
He redesigned for new batch of '2051s.
3. I experienced similar situations.But don't count me.
Don't reach any conclution yet.Just note some related
simultaneous phenomena (first 3 attributed to sudden
failure of my programmer)i.e. Winter ended-humidity
increased-main power supply voltage decreased > price
increase;2051's price jumped from Rs.35/ per piece to
Rs.45/ in only a couple of months.
AT89C51 Rs.55/;AT89C52 Rs.60/;AT89C55WD Rs.95/.
AT89S52 is Rs.52/ and AT89S8252 Rs.190/.
Downloaded all relevant datasheets and software.Frankly
speaking,I see so many errata first time in my life.
When Kai said this is only normal I didn't pay heed.
Now I realize how experinced and knowledgable my friends are.
Incidentally I was around Flash Magic also and rerealised
the authoratative position of Erik.I shall deem myself
fortunate when be able assimilate their viewpoints.
Now my question is to people who have actually used
AT89S52:Is it all right for an absolute beginner of ISP?
The idea is to use cheapest atmel ISP microcontroller
to develop applications to be later flashed in 2051/51/52.
I shall thank others if they post prices of these chips
in their cities specially Indian and neighbouring countries.
Best Regards
A.S.Rudra
P.S.My choice was AT89C51RC2 but I am afraid to ask the
trader because they don't say 'no';they ignore.They have
already said they don't have AT89S2313 or Max7219/7221.