Dan Roganti wrote: That's the OTHER bell! The ASR has an automatic line end bell AND rings on 0x07! -- http://www.hachti.de

I though the 'end of line' trigger for the bell was actually an option, but that all Model 33s (RO, KSR, ASR) had the bell which was mechanically triggered by a ^G character. The Mdoel 43 (smaller, mostly electronic) has a mschanical bell, operated by a solenoid I cna't rememebr if that responds ot end-of-line, or just ^G. Many of the UK-made Creed teleprintes (5 level code) have a pair of contacts which close when the approriate 'bell' character is received. They were used to swtich and external electric bell or buzzer. Oh yes, the VT50 series of DEC terminals have a little relay on the logic board. It'spulsed to geenrate the keyclick and sent a square wave signal to generate the 'bell' which sounds rather like a 'raspberry'. And while not a terminal, and while not triggeered by ^G, the HP9830 has an electronic beeper used to signal errors. It's simply triggered by a single line from the I/O interface PCB and things like the frequency and dureation are set by r's and C's on the PCB, they're not software controlled. But it shows the sort of design that when into these old HPs when you realase there's a little circuit -- OK, just a couple of gates, a trnasisotr, and a few passives -- to geenrate an amplitude envelope on this beep to make it sound more pleasant. One machine where every cent was _not_ saved... -tony