On Tue, 30 Nov 2004 at 12:08:46, wrote:
(ref:
<[EMAIL PROTECTED]>)
>> I thought it was not to do with the code - more the fact that in order to
>> provde 156K more RAM than the old 512K expansions, they used up the ROM
>> space - certainly I have no EPROMs which will work with the Trump Card.
>>
>> However, the Miracle Hard disk works with it somehow (that has a pass
>> through connector for an EPROM board) - if the ROMDisq uses the same form
>> of addressing, then presumably it may work with the Trump Card....
>>
>> Tony - if you're not sure - want to lend me a ROMDisq to try?? Or maybe
>> you could borrow a Trump Card at a show.
>IIRC the romdisq uses a form of addressing similar to the miracle hard
>disk where data is output on selected bits of the address line during a
>second address cycle or something. As you have found out, most EPROMs
>don't work in the 16K slot with Trump Card, hence why Miracle and
>presumably Tony Tebby had to resort to a fairly roundabout way of
>writing to the EPROM slot, plus I think that the QL EPROM slot cannot
>write in the normal way, to write to the EPROM slot you cannot just
>write data to the 16K slot in the normal way.
Exactly. _Any_ writing has to be roundabout.
The address is passed out serially (or maybe only bits 8 and above). The
data is then put on the databus. ... or something like that. I did not
see any documentation.
I did not though realise that TC could not read standard roms.
Tony
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