Somewhere I have (misplaced) a BCROS card from a 360/50. Beautiful, intriguing thing... haven't seen it in years unfortunately.
Also a pair of earrings made from two IBM 1403 chain printer type slugs my dad made for my mother many decades ago, long before 'retro tech jewellery' became a thing. An australian S-100 prototype board for the SC/MP CPU, rescued from the rubbish bin at Applied Technology (who later made the MicroBee) as it was a failed PCB etching. Steve.
