27 Sep
2023
27 Sep
'23
2:13 p.m.
Thanks Jonathan.
I'm not sure this is correct as I needed to select a DS1643 after I tied
pin 26 and pin 27 to pin 28 (and cut 26 and 27 in a chip socket/adapter)
but I did manage to dump it. It is very small though. All zeros until
data starts at 0x1800.
Would you have an idea if this is accurate? Reading as a DS1225 got all
zeros.
https://vintagecomputer.ca/files/Tadpole/Ultrabook2-8528496.bin
Maybe if Eric can write this to his Dallas chip, he might be in business if
it's good?
Santo
On Wed, Sep 27, 2023 at 4:35 PM Jonathan Chapman via cctalk <
cctalk(a)classiccmp.org> wrote:
Speaking of
dumping...
Is it possible to read a Dallas DS1643 in programmer? That's what's in my
Ultrabook. I just tried with a Topmax II that supports it and I get all
zeros. :(
You probably need to make a shim socket and pull pin 26 to VCC (pin 28),
then read it as a DS1225. I'd also pull pin 27 (*WE) to VCC to avoid errant
writes.
Thanks,
Jonathan