Disabling HP65/67 card reader write protect

[Thomas Okken]

(03-07-2019 10:41 PM)Don Shepherd Wrote:  

(03-07-2019 09:06 PM)Thomas Okken Wrote:  How far do you have to push that card in for it to trip the switch? I have never opened my 67 and I have no idea how the mechanism is laid out...

I've never opened mine either (gummy wheel fixed by someone who knows what they are doing). As I recall, I just inserted the 45 degree angle card maybe .5 inch into the opening on the left side (until it was gripped) and then tried to write the card inserted in the right side, and that worked. You may need to experiment with +/- .5 inch if it doesn't work the first time, but my memory is that it worked really well without a lot of retries.

Hmm, I get Error every time. Then again, I'm not using a cut-down magnetic card, but a strip of thin cardboard cut to the same width and 45° angle at the end. It seems to be a bit thicker than a magnetic card, maybe that's the problem? I am reluctant to cut an actual magnetic card because I don't have that many, and, well, just because.

(I have verified that the card reader reads and writes uncut cards, so that's not the problem.)