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HP21 uses same RAM chip as HP25?
05-21-2019, 04:28 AM
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RE: HP21 uses same RAM chip as HP25?
(05-21-2019 01:53 AM)calc-calcs Wrote:  I was wondering if the HP21 uses the same RAM chip (HP PN 1820-1564 or AMI/Mostek MK6220N).

You'll find here a reference table about the chips used in the HP calculators.
According to this table the RAM chip 1820-1564 is used in the HP 22, 25, 91.
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RE: HP21 uses same RAM chip as HP25? - Didier Lachieze - 05-21-2019 04:28 AM



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