When they got it running under Hercules, it ran with 8M memory but not 9-16M.
On Thu, Jul 9, 2026 at 11:01 AM Paul Gilmartin <[email protected]> wrote: > > On Wed, 8 Jul 2026 18:51:00 -0500, Mike Schwab wrote: > > >APL\360 thought no one would ever need 9MB, so they used the top bit > >of a 24 bit address field. > > > Would that cause addressing exceptions? Or was that the Bad Old Days > when addresses wrapped at installed storage? > > (What's an "addressing exception"?) Some Apple II hacks depended on > using the effect of invalid addresses to detect vertical retrace! > > $1/byte? $0.125/bit? weren't those cores threaded by hand labor? > > -- > gil > > ---------------------------------------------------------------------- > For IBM-MAIN subscribe / signoff / archive access instructions, > send email to [email protected] with the message: INFO IBM-MAIN -- Mike A Schwab, Springfield IL USA Where do Forest Rangers go to get away from it all? ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
