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

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