puzzled cst qdisk interface

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techy
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puzzled cst qdisk interface

Postby techy » Sun Jul 05, 2020 6:26 pm

Is a cst qdisk interface indicating its presence at start up in the upperlines of the screen ??

does anyone have the possibility to sent me a screenprint .

since my interface is NOT displaying anything , defective or ........

i verified with a rom module , and that one displays in the top line .


it is a cst qdisk ver 4 1986 with 1.19 and 1.16 firmware ( as i suspected 1.19 )


Zx81-16k exp.- Spectrum 48 - Spectrum 128- Interface 1 - DIVide - Zx flashcard- Zx printer - Ram turbo - Velleman interface system - Currah microspeech - Ql - Miracle 512k exp.- Ql printer - Cst Qdisk interf.- Qubide - Double 3.5 floppy- Minerva - Ice 1.9 - Ql Usb mouse adapter - Qimi-und vieles mehr .
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BSJR
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Re: puzzled cst qdisk interface

Postby BSJR » Tue Jul 07, 2020 1:11 pm

techy wrote:Is a cst qdisk interface indicating its presence at start up in the upperlines of the screen ??
does anyone have the possibility to sent me a screenprint .
since my interface is NOT displaying anything , defective or ........
i verified with a rom module , and that one displays in the top line .
it is a cst qdisk ver 4 1986 with 1.19 and 1.16 firmware ( as i suspected 1.19 )

I think there should be a message at the top.
Tested on a BBQL with only the interface added, it says: "CST QDisc Controller v 1.13 © 1984"

BSJR


RWAP
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Re: puzzled cst qdisk interface

Postby RWAP » Wed Jul 08, 2020 6:31 am

If it doesn't show - the interface may not be properly pushed into the QL edge connector, but before you check that, look to see if you have bent any pins in the edge connector!!


techy
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Re: puzzled cst qdisk interface

Postby techy » Thu Jul 09, 2020 9:35 am

Thanks for all replies ,

something is wrong for sure .


first to start with is ;

anyone got 1.19 version firmware as .bin file ??


i verified my rom and that one is gone ............


Zx81-16k exp.- Spectrum 48 - Spectrum 128- Interface 1 - DIVide - Zx flashcard- Zx printer - Ram turbo - Velleman interface system - Currah microspeech - Ql - Miracle 512k exp.- Ql printer - Cst Qdisk interf.- Qubide - Double 3.5 floppy- Minerva - Ice 1.9 - Ql Usb mouse adapter - Qimi-und vieles mehr .
techy
Bent Pin Expansion Port
Posts: 94
Joined: Thu Sep 06, 2012 6:13 pm
Location: east-flandres belgium

Re: puzzled cst qdisk interface

Postby techy » Sat Jul 11, 2020 5:05 pm

tested the board with 1.16 fresh eprom , verified !!

and no welcoming line on 2 ql's

so the eprom is not communicating with the bus , so out with the multimeter to verify..................

anyone got the schematic ??


Zx81-16k exp.- Spectrum 48 - Spectrum 128- Interface 1 - DIVide - Zx flashcard- Zx printer - Ram turbo - Velleman interface system - Currah microspeech - Ql - Miracle 512k exp.- Ql printer - Cst Qdisk interf.- Qubide - Double 3.5 floppy- Minerva - Ice 1.9 - Ql Usb mouse adapter - Qimi-und vieles mehr .
Martin_Head
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Re: puzzled cst qdisk interface

Postby Martin_Head » Mon Jul 13, 2020 11:05 am

As your original EPROM is dead, Is there any chance that the 5 volt regulator may have been bypassed at some time. And then 9 volts got plugged in and blew things up?


techy
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Re: puzzled cst qdisk interface

Postby techy » Mon Jul 13, 2020 6:57 pm

Martin_Head wrote:As your original EPROM is dead, Is there any chance that the 5 volt regulator may have been bypassed at some time. And then 9 volts got plugged in and blew things up?


7805 looks okay , steady 5v output even after an hour .

eprom 1.16 is tested and okay ( works ok in an eprom board ) .

So my assumption is the eprom is not "attached " to the bus .

so any insight in the circuitry might be handy.


Zx81-16k exp.- Spectrum 48 - Spectrum 128- Interface 1 - DIVide - Zx flashcard- Zx printer - Ram turbo - Velleman interface system - Currah microspeech - Ql - Miracle 512k exp.- Ql printer - Cst Qdisk interf.- Qubide - Double 3.5 floppy- Minerva - Ice 1.9 - Ql Usb mouse adapter - Qimi-und vieles mehr .
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tofro
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Re: puzzled cst qdisk interface

Postby tofro » Mon Jul 13, 2020 8:05 pm

There's a pretty nice description in the QL Technical guide on how expansion cards need to handle requests (Chapter 11.3, "Adding peripheral cards"). That involves address decoding logic and a fast switching transistor - This is the circuitry you should look into.


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techy
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Re: puzzled cst qdisk interface

Postby techy » Tue Jul 14, 2020 6:06 pm

tofro ,

more reading to do , thanks !!


Zx81-16k exp.- Spectrum 48 - Spectrum 128- Interface 1 - DIVide - Zx flashcard- Zx printer - Ram turbo - Velleman interface system - Currah microspeech - Ql - Miracle 512k exp.- Ql printer - Cst Qdisk interf.- Qubide - Double 3.5 floppy- Minerva - Ice 1.9 - Ql Usb mouse adapter - Qimi-und vieles mehr .

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