Search found 1349 matches

by Pr0f
Sun Nov 12, 2017 10:19 am
Forum: Hardware
Topic: Microdrive Unit Design
Replies: 118
Views: 57828

Re: Microdrive Unit Design

Technical docs and hardware shows there are 2 heads, so your calculations need to reflect that 2 heads are in use.
by Pr0f
Fri Nov 10, 2017 11:45 am
Forum: Hardware
Topic: PSU alternative?
Replies: 71
Views: 55704

Re: PSU alternative?

This is just half wave rectification, Sinclair being cheap again ;-) The current requirements for the +12 and -12v are so light, they can get away with this, and the ripple is easily dealt with by the regulator..
by Pr0f
Thu Nov 09, 2017 10:01 pm
Forum: Software & Programming
Topic: QubATA 3.10 I/O area address
Replies: 9
Views: 5456

Re: QubATA 3.10 I/O area address

In theory is it possible to have the hardware registers at a different address, i.e. not in the last 256 bytes, assuming the GALS are set to a different address?
by Pr0f
Wed Nov 08, 2017 5:46 pm
Forum: For Sale
Topic: Minerva v1.66 original rom and carrier
Replies: 5
Views: 4110

Re: Minerva v1.66 original rom and carrier

SOLD :D
by Pr0f
Wed Nov 08, 2017 1:26 pm
Forum: Software & Programming
Topic: QubATA 3.10 I/O area address
Replies: 9
Views: 5456

Re: QubATA 3.10 I/O area address

Interesting... I came across this in the documentation: IO.EXTOP (trap#3, d0=$9) Do externally operation Call parameters : a2 address of the user routine to be called d1/d2/a1 parameters supplied to the user routine passed in a2 Return : d0/d1/a1 as returned from user routine When control is passed ...
by Pr0f
Wed Nov 08, 2017 12:19 pm
Forum: Software & Programming
Topic: QubATA 3.10 I/O area address
Replies: 9
Views: 5456

Re: QubATA 3.10 I/O area address

I think in the Qubide assembly source, the I/O area is defined as a manifest constant - so changing it once and reassemble does the trick. QubATA driver and ROM image is in compiled form. But then this was just a question. If the image is loadable anywhere - why is there a reference in the REXT file...
by Pr0f
Wed Nov 08, 2017 10:06 am
Forum: Software & Programming
Topic: QubATA 3.10 I/O area address
Replies: 9
Views: 5456

Re: QubATA 3.10 I/O area address

The project in question is to integrate a qubide into a black box QL 'clone'. It's a one off experiment, but I plan to use some part of the largely undecoded QL expansion area between 18000- and 1c000, as 'technically' the I/O is internal, and let's face it - Sinclair are not going to be using any o...
by Pr0f
Tue Nov 07, 2017 11:43 pm
Forum: Software & Programming
Topic: QubATA 3.10 I/O area address
Replies: 9
Views: 5456

QubATA 3.10 I/O area address

A question on the QubATA driver: Is it possible to have the ROM loaded at one address range, and the hardware address as described by the GAL's at another address? I see in the driver it looks like it's coded for 0C000, but I am guessing the driver code itself is relocatable. Does the address repres...
by Pr0f
Mon Nov 06, 2017 8:06 pm
Forum: For Sale
Topic: Minerva v1.66 original rom and carrier
Replies: 5
Views: 4110

Re: Minerva v1.66 original rom and carrier

PS - I've no idea what the other PAL chip is, but you are welcome to it :-)
by Pr0f
Mon Nov 06, 2017 8:05 pm
Forum: For Sale
Topic: Minerva v1.66 original rom and carrier
Replies: 5
Views: 4110

Re: Minerva v1.66 original rom and carrier

Hi Martyn,

I am in the UK too, I would put this in a Jiffy bag, so owing to thickness this would be large letter postage.

I would estimate about £1.22 for 2nd Class, and £1.30 for 1st class

Thanks,

Dave.