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Found these inside a non-working 71B
03-13-2018, 10:22 PM
Post: #71
RE: Found these inside a non-working 71B
(03-13-2018 09:58 PM)Paul Berger (Canada) Wrote:  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.

All my HHP modules have interface IC with erased labels. I took the 1LQ4 reference from this HP part number list.
But yes, a 1LJ4 can be seen in a picture in Sylvain's compendium.
May did 2 versions exist (like the 1LB3 and 1LR4 HP-IL chips)?

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RE: Found these inside a non-working 71B - J-F Garnier - 03-13-2018 10:22 PM
What's U10? - Dave Frederickson - 03-15-2018, 03:43 PM

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