On 14 Jan 2005 16:31:04 -0600, Dave
put finger to keyboard and composed:

Rate chips are ~$200, at least that's what I've been able to determine
regarding their pricing for other countries. In the US they just say
that "rate prom upgrades are free when you have an active pitney bowes
service contract".

I changed 2 bytes of data, burned another Eprom and plugged it in but
upon powerup I got an error message. There must be a checksum burned
in there.

What was the error?

I once hacked a 386 Award BIOS that had a simple zero checksum. If
yours is of this type, then locate an innocuous text string (eg the
copyright notice) and change one of those bytes to return the checksum
to zero, or whatever it was.

On Fri, 14 Jan 2005 07:02:11 GMT, "NSM" wrote:


"Dave" wrote in message
. ..
| I bought a Pitney Bowes A510 digital scale on Ebay originally just to
| use it for weighing shipments to calculate by hand what the postage
| should be (goes up to 10 pounds in 0.1oz increments).
|
| However this scale has a built in price calculator - it'll show what
| the $$ should be to ship something. Problem is the rates are not
| updated ( for example first class 1 oz is $0.33 instead of $0.37). It
| would be nice to use this function.
|
| Rates are stored on a pluggable card containing a 27c64 ROM chip.
| I've dumped the code, looked at it in a hex editor but don't know what
| bytes to change, where the checksum is stored, etc.
|
| Anyone have a current hexdump of the rate prom from a Pitney Bowes
| A510 or similar scale? Or know how the data is arranged so I know
| what bytes to change to update to the current postage rate?

You can't buy the upgrade chip?

If I had to do this, I would substitute an sram chip configured to look like
the eprom, then try changing bytes and see what affects what. Pain to do,
but unless you can analyse the rest of the system I see no other way to do
it.

N




- Franc Zabkar
--
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