I don't know if it was an option. If so, presumably it was included if you elected the emulator option, since both are intended for running OS/360.
paul > On Apr 10, 2024, at 1:00 PM, CAREY SCHUG via cctalk <cctalk@classiccmp.org> > wrote: > > I thought you could get regular channels as an optional feature? > > <pre>--Carey</pre> > >> On 04/10/2024 11:47 AM CDT Paul Koning via cctalk <cctalk@classiccmp.org> >> wrote: >> >> >>> On Apr 10, 2024, at 11:25 AM, Jon Elson via cctalk <cctalk@classiccmp.org> >>> wrote: >>> > ... >>>> >>> ... The model 44 had no channels, there was only direct I/O (a set of >>> 32-bit parallel input and output registers) and a pair of cartridge hard >>> drives inside the CPU cabinet. Think DEC RK05s. >> >> No channels? That doesn't sound right. The 360/44 I used certain had an >> RK05-like drive in the CPU cabinet (I only remember one, though). I'm >> fairly sure it was a 16-sector pack, so more like an RK08. But the system >> ran both OS/360 and TSO, and had three 2311 disk drives, three tape drives >> (with an amazingly ugly mechanical design), a card reader/punch, and a line >> printer. Also some sort of terminal max, but I never used the timesharing >> feature so I don't know what that involved. >> >> It certainly had enough of a channel-like I/O system that the emulator >> program loader could be implemented in a card reader channel program no >> different from that of other 360s. I remember quite well deciphering it >> using the CCW documentation on the "green card". >> >> Yes, the emulation of SS instructions was via traps, but specifically by a >> trap into emulator mode in a separate chunk of memory not visible to the >> main OS. >> >> I never saw the cartridge drive in use by anyone. >> >> paul