Front panel switches - what did they do?
phb.hfx at gmail.com
Tue May 24 16:21:29 CDT 2016
On 2016-05-24 4:13 PM, Chuck Guzis wrote:
> On 05/24/2016 11:39 AM, Eric Smith wrote:
>> On Tue, May 24, 2016 at 12:25 PM, Paul Koning
>> <paulkoning at comcast.net> wrote:
>>>> On May 24, 2016, at 2:07 PM, Chuck Guzis <cclist at sydex.com>
>>>> wrote: ...and the "transformer" ROS used on the 360/40 (and
>>> You mean "Core rope memory"?
>> IBM's TROS and Core Rope Memory use the same principle, but the
>> physical construction is significantly different. Core rope memory
>> was very labor-intensive to manufacture, while TROS was not.
> There's a photo here;
> I seem to recall that reworking the 360/30 microprogramming was
> preferred by tinkerers over the 360/40 was primarily that CROS was
> easier to work with than TROS.
> I don't recall what the RCA Spectrolas used.
The CROS cards used in a 360/30 where the same size as an 80 column card
on purpose so you could you a keypunch machine to program the microcode.
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