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Comment by dylz | Hacker News Reader

What are mechanical slide things? Like you swipe instead of use chip?

I can't tell if you're being cheeky or are just really young. Up until the past decade or two, it was very common to process credit cards by placing the card onto a tray with a slip of paper over it, and swipe a pressure bar over the tray. This physically caused the digits on the card to make an impression on the paper:

http://cdn.toptenreviews.com/rev/misc/articles/4734/type-or-...

Many credit cards today simply have the digits printed on them in ink, rather than raised lettering, so I don't know how this would even work half the time today.

>Many credit cards today simply have the digits printed on them in ink, rather than raised lettering, so I don't know how this would even work half the time today.

It wouldn't and a lot of debit cards I know - at least in Europe - are issued exactly for that reason: So they don't work without online authorization.

I don't recall seeing a zip zap machine like that in the last 10 years.

clunk clunk

I dont think I've seen a mechanical recorder since the late 90s and even then it was rare.

They're still kept around as a fallback in case the POS system goes down. At least, that was the case when I worked as a grocery store clerk 7-8 years ago.

EFT used to go down at the store I worked at weekly midnight Monday morning for maintenance for a few hours.

Processing them manually was the only option.

It's rare but I've seen them < 5 years ago in remote locations where electricity isn't everywhere (like rural tourist destinations).

I love them - makes me feel like I'm leading the travel high life in the 1970's. (same feeling I had when landing in Tunis national airport - cash exchange registers, competing with each other on rates! Actual coin operated pay phones! Loved it)

The taxi drivers in Edinburgh used them until about 8 years ago. Then they were replaced with mobile phone based payment, then finally with chip and pin. When they used the mechanical impression machines, they wouldn't accept card payment from on-street pickups due to the risk of fraud (as perceived by the driver).

The other place I saw one used c2008 was when buying a ticket from a guard on the platform at Kings Cross after I missed my train. Then the ticket price didn't show up on my online card statement for about a month.

The only time I've seen one (actually the first time I learned about them) was at an outdoor market where I bought some handmade jewelry. The woman kept it around as a novelty alternative to her phone-dongle card reader.

I'm not certain that this is what the OP was referring to, but this is what I thought of:

http://www.possupply.com/media/catalog/category/4850-CC-Impr...

It's a machine that you use with copy paper and slide it over the card. The name and numbers are raised up on most credit cards and leave an imprint on the paper. The cardholder then signs the paper.

I've used them when I worked at a department store for customers who's magnetic strip had worn out to the point that our computers couldn't read the card. I imagine the main reasons for a taxi driver to use one is that 1) it's cheap and reliable, and 2) it works offline.

http://ecx.images-amazon.com/images/I/51bClUYQTPL._SL1000_.j...

They take an imprint of the embossed credit card details for later processing

What is there to imprint? Most cards I see dont' seem to have raised lettering; it's just printed numbers on the back.

Also, how does this work with chip-required cards?

This system was most commonly in the 90's and earlier. Back then all cards had raised letters. Many modern cards are online-only to reduce the rampant fraud possible with this old method.

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