Found these inside a non-working 71B

[Paul Berger (Canada)]

(03-13-2018 09:03 PM)Dave Frederickson Wrote:  

(03-13-2018 07:17 PM)J-F Garnier Wrote:  BTW, I'm still interested by any information on the 1LQ4 chip. Somebody once said that a documentation exists but never shared.

Tony Duell says he has a copy of the datasheet.

http://www.hpmuseum.org/cgi-sys/cgiwrap/...read=11509

All of the HHP modules I have use a chip 1LJ4 and if this is the chip that HHP has always used it would be capable of supporting 64K of RAM. Maybe if I play around with the pins that appear to be for configuration and then observe what it reports, I can learn more about it.

Paul.