QSound and QPrint Interface

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Derek_Stewart
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Re: QSound and QPrint Interface

Post by Derek_Stewart »

I was given a non-working Qsound board many years ago, which someone had tried modify the board and overheated the through plating on the PCB tracks.

I asked Jochen at a Quanta Workshop in the 1990s about the Qsound rom code, which he really was not bothered about discussing the code.

I have been repairing PCBs with this type of fault, so I hoped get the Qsound board running after 20 years of sitting in box.

However, someone wanted to remake the Qsound board, so I sent the faulty Qsound board for drawing up the circuit diagram.

This has never been done, he says the board will be returned, never bothers.
Last edited by Derek_Stewart on Sat Dec 09, 2023 9:01 am, edited 1 time in total.


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Derek
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mk79
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Re: QSound and QPrint Interface

Post by mk79 »

Well, I certainly don't want to be judged by code I wrote 30 years ago :D Granted, I was 11 at the time and only started writing 68k assembler but I shudder even at the code I wrote 20 years ago :shock: There have been quite a lot of "leasons learned" since then... :ugeek:


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NormanDunbar
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Re: QSound and QPrint Interface

Post by NormanDunbar »

mk79 wrote:... I shudder even at the code I wrote 20 years ago...
I sometimes shudder at the code I wrote 20 minutes ago! :o

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nikosdoykas
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Re: QSound and QPrint Interface

Post by nikosdoykas »

so i make a simulation for the q sound q print PCB.... i can se all the joints at pcb on botom...
but i dont know some connections on top.....its hidden by the chips......
OR the values of the tantalioum?? cap transistor?? maybe is a bs250 by guess....or the small cap near to the 7805
has any one the schematics? i will be glad to re design the qprint-qsound
AY-3-8910A.png


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mk79
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Re: QSound and QPrint Interface

Post by mk79 »

Sorry, but why bother? There is no software with which the board needs to be compatible with and any newly built solution should feature at least a real crystal for AY clock and two AY chips IMHO.


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Peter
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Re: QSound and QPrint Interface

Post by Peter »

Maybe the detective work, the historical reverse engineering, is the challenge here... even I was tempted for a second, although I'd find a card without extension bus passthrough useless, no matter one or two AY chips.


nikosdoykas
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Re: QSound and QPrint Interface

Post by nikosdoykas »

for historical reasons i think its worth to make the schematic for archive...ho knows some one on the future say aok nice .....


Derek_Stewart
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Re: QSound and QPrint Interface

Post by Derek_Stewart »

mk79 wrote:Sorry, but why bother? There is no software with which the board needs to be compatible with and any newly built solution should feature at least a real crystal for AY clock and two AY chips IMHO.
I only contentplated this, mainly to repair my Qsound board.

I have part done a Qsound Schematic, but I need my Board back to check the exact circuit routing.

I was going to alter the driver code to integrate into the QL sound system by giving a more expansive BEEP command.
Last edited by Derek_Stewart on Sat Dec 09, 2023 9:02 am, edited 1 time in total.


Regards,

Derek
nikosdoykas
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Re: QSound and QPrint Interface

Post by nikosdoykas »

I HOPE TO HAVE YOU BOARD BACK...


Silvester
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Re: QSound and QPrint Interface

Post by Silvester »

Derek_Stewart wrote:
mk79 wrote:Sorry, but why bother? There is no software with which the board needs to be compatible with and any newly built solution should feature at least a real crystal for AY clock and two AY chips IMHO.
I only contentplated this, mainly to repair my Qsound board.

I have part done a Qsound Schematic, but I need my Board back to check the exact circuit routing.

I was going to alter the driver code to integrate into the QL sound system by gaving a more expansive BEEP command.
Here's my take on it, if it's any help

EDIT: see update
Last edited by Silvester on Tue Oct 11, 2022 12:45 am, edited 1 time in total.


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