Re: It costs more to write new software than to maintain old hardware
The VAX applications that I mentioned used VAX RS232C interfaces. The well supported VAX simulator bought from HP perfectly simulates VAX RS232C interfaces and so there were no glitches when the old VAX software was run. The only downside was the cost. I think that both companies paid about £50,000 for two HP PCs running VAX emulation software. HP owns the remnants of DEC and so HP employs many ex-DEC programmers who could be expected to write a perfect VAX simulator.