QL-SD ROM

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NormanDunbar
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Re: QL-SD ROM

Postby NormanDunbar » Sat Mar 28, 2020 10:41 pm

mk79 wrote:Surprise, I developed some piece of hardware: https://www.kilgus.net/2020/03/28/ql-sd-rom-the-early-days


I read this and got really excited by it. Then I remembered that I use QPC2 on Linux. I got all deflated after that. :(

Looks like an excellent piece of kit Marcel, well done.


Cheers,
Norm.


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Cristian
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Re: QL-SD ROM

Postby Cristian » Sun Mar 29, 2020 1:26 pm

janbredenbeek wrote:The Miracle hard disk used the ROM port too and did (of course) work in conjunction with the Trump card

Thank you Jan. I can't understand all the technical details, but you gave me hope :-)
Anyway, if this can help to focus, I'm sure the ROM port (minor?) issue was due only to the achievement of 896K RAM limit.


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RalfR
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Re: QL-SD ROM

Postby RalfR » Sun Mar 29, 2020 1:38 pm

janbredenbeek wrote:The Miracle hard disk used the ROM port too and did (of course) work in conjunction with the Trump card (it even had a through-connector for extension ROMs).
I haven't understand (yet), how the Miracle HD uses in- and output in an output ROM plug...?


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tofro
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Re: QL-SD ROM

Postby tofro » Sun Mar 29, 2020 1:50 pm

RalfR wrote:
janbredenbeek wrote:The Miracle hard disk used the ROM port too and did (of course) work in conjunction with the Trump card (it even had a through-connector for extension ROMs).
I haven't understand (yet), how the Miracle HD uses in- and output in an output ROM plug...?


In a nutshell, reading specific addresses writes bytes to the peripheral.

QL-SD, for example, reserves an address range of 256 bytes in the upper part of the ROM address range to be able to write bytes to peripherals behind the port. If you read byte address 0 of this range, you transfer a 0, if you read byte address 255, you actually write 255 to the card.

Tobias


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Vyper68
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Re: QL-SD ROM

Postby Vyper68 » Sun Mar 29, 2020 8:47 pm

I would really like to be able to get one each of these fantastic devices. So hopefully there will be a couple left.


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jdavis6809
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Re: QL-SD ROM

Postby jdavis6809 » Sun Apr 12, 2020 5:56 pm

hello,

pull me on the too,

thanks

john davis



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