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@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 >
