ICL OPD

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Pr0f
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Re: ICL OPD

Postby Pr0f » Sun Aug 16, 2020 12:32 pm

Chr$ wrote:
Pr0f wrote:
As far as I know, there is no speech ROM on board


I was under the impression that there was a speech ROM installed.

I think there is speech in ROM, but it is in the ROMS that the CPU has access to and is not mapped directly to the speech chip, which the data sheet does say is possible.


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RalfR
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Re: ICL OPD

Postby RalfR » Sun Aug 16, 2020 3:44 pm

RalfR wrote:
tofro wrote:They're listed in the famous "ZX Microdrive Book"
Is that the book from Jochen Merz? I remember that he has written a book of that.
Seems to be the book from A.Pennel. Jochen has written a similar one.


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Re: ICL OPD

Postby tofro » Sun Aug 16, 2020 3:48 pm

RalfR wrote:
tofro wrote:They're listed in the famous "ZX Microdrive Book"
Is that the book from Jochen Merz? I remember that he has written a book of that.


Nope. "The "Spectrum Microdrive Book" is by Dr. Ian Logan, the guy who developed the Microdrive at Sinclair. So, from the bird's mouth.

Microdrive Book.png


I think there was a German edition, rather a bit big-in-the-boots called "Das Microdrive-Universum".


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janbredenbeek
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Re: ICL OPD

Postby janbredenbeek » Sun Aug 16, 2020 10:30 pm

tofro wrote:Nope. "The "Spectrum Microdrive Book" is by Dr. Ian Logan, the guy who developed the Microdrive at Sinclair. So, from the bird's mouth.

I used to have this book but sold it along with my Spectrum stuff :(
From a disassembly of the IF1 ROM I found that hook code $27 reads a random record of a PRINT file (specified by CHREC).
So this is a somewhat crude way to set the file pointer.


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Re: ICL OPD

Postby RWAP » Mon Aug 17, 2020 7:22 am

I have been contacted by someone looking for a spare case for the monochrome monitor if anyone has one!

A long shot I know - but a fire destroyed the plastics, the monitor itself is still working


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Re: ICL OPD

Postby Chr$ » Mon Aug 17, 2020 11:08 am

RWAP wrote:I have been contacted by someone looking for a spare case for the monochrome monitor if anyone has one!

A long shot I know - but a fire destroyed the plastics, the monitor itself is still working


I have a monochrome monitor that isn't working and has been in for repair with an old school CRT man for about the last 8 months! Apparently the 12v is missing and/or something else isn't right with the voltages for the tube. I found a schematic for him that is a copy of a copy of a 1980s fax - not great quality and hard to follow.

So between us at least a complete and working monitor would exist again. I will at some stage go and visit it and if it's terminal I'll have to decide what to do. I like the idea of having an original working monitor but I do already have the scart solution and CRTs take up so much space.


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Re: ICL OPD

Postby NormanDunbar » Mon Aug 17, 2020 6:49 pm

If anyone is interested, I think this is the Interface 1 ROM disassembly:

https://www.tablix.org/~avian/spectrum/rom/if1_2.htm

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Re: ICL OPD

Postby tofro » Mon Aug 17, 2020 7:47 pm

janbredenbeek wrote:
tofro wrote:Nope. "The "Spectrum Microdrive Book" is by Dr. Ian Logan, the guy who developed the Microdrive at Sinclair. So, from the bird's mouth.

I used to have this book but sold it along with my Spectrum stuff :(
From a disassembly of the IF1 ROM I found that hook code $27 reads a random record of a PRINT file (specified by CHREC).
So this is a somewhat crude way to set the file pointer.


Agreed. A very limited way to be able to read a 512-byte-chunk from a file. That's about it.


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