23 Mar
2010
23 Mar
'10
7:38 p.m.
On Tue, Mar 23, 2010 at 7:19 PM, Gene Buckle <geneb at deltasoft.com> wrote:
On Tue, 23 Mar 2010, Liam Proven wrote:
I wasn't planning on trying to format, access or otherwise use 1.4MB
disks as 1.4MB. Just format them to /less/ than capacity and treat 'em
as normal.
The machine is a Sinclair Spectrum, although I also have a QL it would
be fun to revive this way. On neither is there any option to select
/how/ you format the disks, I believe. Both only support 80-track DS
DD drives & disks.
The Spectrum+DISCiPLE put 780K or so on a disk, I think. I've never
tried to attach my QL to its disk interface...
--
Liam Proven ? Profile: http://www.linkedin.com/in/liamproven
Email: lproven at cix.co.uk ? GMail/GoogleTalk/Orkut: lproven at gmail.com
Tel: +44 20-8685-0498 ? Cell: +44 7939-087884 ? Fax: + 44 870-9151419
AOL/AIM/iChat/Yahoo/Skype: liamproven ? LiveJournal/Twitter: lproven
MSN: lproven at hotmail.com ? ICQ: 73187508
On Tue, Mar 23, 2010 at 6:31 PM, Pete Turnbull
<pete at dunnington.plus.com>
wrote:
How are you going to handle the data rate difference? ?If memory serves,
using ?1.44MB media results in a higher RPM and a higher data rate.
On 23/03/2010 17:35, Chuck Guzis wrote:
Thanks, both!
I have a few bare drives knocking around, some of which are, I hope,
elderly enough that they have DS jumpers. If not, I don't think I
fancy trying to make this cable up... 8?(
As far as select--while it's nice to have a
drive with select jumpers,
it's also possible to take an inexpensive drive that's permanently wired
as
DS1 and simply swap the DS1 and DS0 lines at the connector--not exactly
the
"IBM PC twist", because you want to leave the motor conrol pins as-is.
?So
the "twist" to get a DS1-only drive to recognize DS0 would be the 3-wire
bundle 12-13-14.
Er, no, DS0 is pin 10 so it would be 10-11-12. ?The "IBM twist" swaps DS1
(Device Select B, in IBM parlance) and DS2 (Device Select A) rather than
DS0
and DS1, and additionally swaps MotorOn with DS0.