HP-71b CMT-64E Eprom - Whats under the black goop ?

[coitboy2000]

(03-19-2020 05:33 AM)Dave Frederickson Wrote:  

(03-19-2020 04:49 AM)mfleming Wrote:  Now that's pretty neat. I didn't look closely at the photos and just assumed plated through holes like the Classic and Woodstock connections. Looks like an IC under the socket? Forgot about the FRAM board. Any other parts on the BOM still stocked and available?

The IC under the socket is most likely a 1LJ4.

The FRAM71B FPGA and FRAM are still active and available. None of the other parts are special.

Thanks Dave and all. I am in awe of the knowledge of this group.

My motivation for the original post was to establish what was beneath the goop. Looks like a 1LJ4. Obviously it would be great to know whether the CMT eprom module could be programmed without cracking open the module itself. Not sure how the Fram71 can assist with this ? I am going to try and program an open module in circuit, unless thats a bad idea?

If only the Fram71 was still in production

Cheers

Richard