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 <[email protected]>
> 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 <[email protected]>
>> wrote:
>>
>>
>>> On Apr 10, 2024, at 11:25 AM, Jon Elson via cctalk <[email protected]>
>>> 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
