Stack Depth requirements for CP/M 2.2 CBIOS

On 31 Jan 2009 at 7:54, ROBO5.8 wrote: Hi Robo, The CBIOS that I wrote used interrupts for just about every service, including video refresh, timer and alarm-clock functions, printer and keyboard I/O as well as serial and HPIB I/O--a separate stack was pretty much madatory. I think I still have the code kicking around (ties neatly into another discussion thread, doesn't it?) If you'd like, I can dig it out and forward you the disk I/O code at least as far as blocking/deblocking is concerned. It's been 30 (gasp) years since I worked with it, so my memory of the details is a bit fuzzy. But I seem to recall that we did apply all of the patches that were sent along by DRI. I am certain that the CBIOS implementation could build itself, which says something concerning your problem, as that probably ran to somewhere around 4000-5000 lines of code. Cheers, Chuck