On Thu, 22 May 2014, Johnny Billquist wrote: With parity disabled and RSTS/E: https://ghostbin.com/paste/ksd3c a bad ~50K? I can disable everything above 512kByte which is...i forget how many words. 512Kbytes is 256Kword. :-) Ahh. But it's not clear that the address are in Kwords... It's a 1M board...so it's either at the very upper end of memory or in the middle. Johnny -- Cory Smelosky http://gewt.net Personal stuff http://gimme-sympathy.org Projects