> On Dec 21, 2024, at 8:53 AM, Donald Whittemore via cctalk > <cctalk@classiccmp.org> wrote: > > Rod Bartlett wrote: >>> >> As a field engineer for Honeywell, I always dreaded the holidays because so >> many people >> would launch print jobs which used repeated overstrikes to create pictures. >> Those jobs >> sometimes fired the maximum number of hammers at a time to speed up the >> picture creation >> which would sometimes cause multiple hammer actuator fuses to blow. More >> than once I had >> to buy all the 2 amp fuses from multiple Radio Shacks to get the printer >> operational >> again. Those overstrikes also caused the paper to become more saturated >> with ink which >> resulted in more paper/ink residue getting deposited in the print chain, >> which required >> heavier than normal cleanings during the next preventative maintenance >> window. >> >> Another thing which caused more work for field engineers around the holidays >> were jobs >> sent to the card punches to play Jingle Bells by punching fully laced cards >> in time to the >> music. It was entertaining unless they caused card jams too bad for the >> operators to be >> able to clear by themselves. Fully laced punch cards are too flexible to >> pass through the >> punch path cleanly. >> >> - Rod > > You mean like this? > https://www.ibmjunkman.com/cards/?Holder=6309&Img=1
That's it. As far as I know, fully laced cards were only useful for producing a deep percussive sound while punching the card. Trying to push cards rendered flexible by so many holes at 300 cards per minute caused some spectacular card jams which occasionally required partial disassembly to fully clear.
