HP-71b card reader eprom module issues

[rprosperi]

(09-07-2020 09:27 PM)coitboy2000 Wrote:  I did see that but was unsure what it means by complemented? Is it just replacing 00s with FFs?

Richard

Invert all the bits. Change the 1's to 0's and 0's to 1's. It's needed for the 71 to read this format EPROM chip in the HHP carrier.