On Jan 6, at 14:06 | Jan6, Dilwyn Jones wrote:
> Tony Firshman wrote:
>>
>> Anyway Ben (my son) gave me one for Christmas. A great moment and an amazing
>> gift.
>> The magnetic card reader roller was "mush" as an American enthusiast told me
>> it would
>> be. I reamed out the centre of a QL microdrive roller and it is *perfect*.
>
> Great story!
>
> But what happens when you do DIR MDV1_ on it after your repair?
>
> :o)
>
>
The calculator does not start the motor (8-(#
The drive system works fine if I apply power direct to the motor. I now have to
delve further.
I wonder if there is a drive power transistor (8-)#
.... and you know how we complained about having only 100k plus on a
microdrive. The magnetic card has 100 bytes - or similar.
Having a limit of storage (HP has only a handful of pre-defined registers and
zero ram) makes for efficient programming.
One trick HP suggest to double storage is the use integer and fractional part
as two separate integers.
I have said this before but Laurence Reeves was a master of this sort of
programming. His QL Forth was under 4k of machine code I think.
Tony
--
[email protected] http://firshman.co.uk
Voice: +44(0)1442-828254 Fax: +44(0)1442-828255 Skype: tonyfirshman
TF Services, 29 Longfield Road, TRING, Herts, HP23 4DG
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