Wouter van Ooijen wrote:

> Whow, I think I have to enter Olin-mode!

May be you should read this answer to you before. I think you must have
missed it:
________________________________________________________________________
Wouter van Ooijen wrote:

 >> I understand that 877A part has a different algorithm than
 >> the 877. This
 >> does not seem to apply to the 628/628A parts since I can program both
 >> type with FPP programmer which only offer 628.
 >> The problem is the erasing. FPP does not erase the 628A correctly.
 >
 >
 >
 > So what about the logical conclusion: the 628A does not use the same
 > erase algorithm as the 628? Of course instead of guessing you could read
 > the programming specifications


Thanks (for the slap on finger) Wouter but this is not what I understood
by comparing the programming specifications DS30034D for the 628 and
DS41196D for the A part.

The "Bulk Erase Program Memory" command the 628A is more powerful than
on the 628. It erases all : the program, the ID and the Config word at
once. The same command on the 628 does not erase the config word. One
must revert to Section 3.11 to do it.

The command being more powerful, I had the intuition that FPP should be
able to do it and as a matter of fact, IT DOES. I was hoping someone had
it figured out already.

HERE IS THE PROCEDURE TO ERASE 628A WITH FPP:
Uncheck Config and press the Erase button.
That is it

One command that is not available for the 628A is "Begin
Erase/Programming Cycle". So FPP must be force to use "Begin Programming
Only Cycle" instead.

HERE IS THE PROCEDURE TO PROGRAM THE 628A WITH FPP:
1) Uncheck "Config" and press Program button. That programs both program
    and data memory but not the Configuration word.

2) Then check "Config" and press Program once more to program the config
    word.

In conclusion: programming the 628A with FPP is POSSIBLE but requires a
little wiggling. Overall it takes 14sec to program. Picallw requires 13
sec and WinPic 23 sec for the same program.

 > But beware that the erase sequence for

 > all c84-programming-compatible chips in the programming specs is wrong.
 > The correct seqence can be found in the piclist archives (this lore is
 > passed on by word of mouth - or rather email.


Can you be more specific? A keyword would save a lot of time.

 >> Does any one know of other free programmer out there that can program
 >> the A parts ?
 >
 >
 > I sell the http://www.voti.nl/wisp628 as kit or build, but all
 > information for DIY is available.


I was referring to a free software programmer like FPP for a Tait like
kind of programmer. I am already committed to that type.

Gaston Gagnon
_________________________________________________________________________

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