David Cantrell wrote:
On Fri, Oct 31, 2008 at 05:31:24PM -0400, Jeremy Katz wrote:
On Oct 31, 2008, at 16:58, David Cantrell <dcantrell@xxxxxxxxxx> wrote:
IBM filed a feature request against RHEL 6.0 to include a sample punch
card
reader script on the install media for s390x. Since it's a rhel6
request, we
should get those in to Fedora earlier rather than later, so here's the
pat
Wow. If only I thought you were making it up. In any case, looks okay
If only I were. As far as "what about the past" requests go, the mainframe
certainly leads the pack.
Why, do you suppose, that PCs begin with a display that's 80 characters
wide, and not 90 or 120 (120 matches a lot of old impact printers, it's
a logical size)?
The card reader is a very simple thing to program (at least, while it's
working), and historically could be found in any mainframe configuration.
The hardware (and I don't mean necessarily firmware) could issue a
simple read from a device, read a few bytes and jump into the code just
loaded.
The code just loaded is responsible for reading the rest of the loader.
The same loader that loads from the card reader can also load from tape,
so a deck of cards could be copied to tape and IPLed in the same way.
--
Cheers
John
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