QSound and QPrint Interface

[jobdone]

I've been playing around with these lately. One thing that I have just noticed is when loading arcanoid with the 1.94 rom, I should hear an explosion when I miss the ball, but I do not. when trying the 1.40 rom, the explosion sounds. anyone else having this issue?

[Maskenlos]

Hi Jobdone,

Update 1st June:

I tried V1.93 Version an have exactly the same behavior with the game Arcanoid as you describe above.

Cheers,

Stephan

Hi,

I quickly tried to LBYTES the v1.94 ROM. No sound at all with my QSOUND I/F.

Stephan

[jobdone]

Thanks for the reply, I'm glad it's not just me

[aalea]

What arkanoid? I was thinking that there are no software for this interface... it's available for donwload? I want to try it. it's for a standar QL?

[jobdone]

See screenshot. It's available from RWAP still.

[otis]

Hi folks,

I've put togehter this interface, but unfortunately, it does not seem to boot. I've tried multiple QLs, multiple IC sets, reprogrammed EEPROM with different ROM versions, to no luck.

Please, does have anyone some clues I could use (and not destroy the QL along the way?)

Thanks.

[Maskenlos]

Hi Otis,

Did you use this schematics for your rebuild?

If I compare the schematics with my QSound I see a mismatch in transistor connections. In my case Emitter goes to +5V, Base to 74LS... and Collector to DSMCL

As I have found the Transistor speed to be critical and also found boot issue when tried with the ZX8301 replacement you may consider to check this. See some posts before in this thread.
Everything at you own risk.

Best, Stephan

[otis]

In fact, I've used https://github.com/alvaroalea/QL_QsoundQprint_clone/

In a desperation I even turned on the oscilloscope to see what's happening, without any significant luck.

My observation is that the CE signal for EPROM is not changing at all. I even tried multiple IO sets (AY, 6821, EPROM, TTLs).

[aalea]

Test that you have 5V, also test that all IC (at least the 4 I indicate below) get the correct 5V and GND.

Then If you leave only the ROM, U2, U3 and U5 in my schematic, you shall see the QL booting and the message of the ROM in the screen.

This is the first step, if you check the schematic, CS2/OE (pin 20 of eeprom) is the output of a very simple address decoder, you should check signals go correctly.

Take care of SP0 to SP2, if for some reason they are not 0V, with some rom there is a bug and will not be detected.

[Maskenlos]

I still wonder why the transistor is rotated compared to my Qsound.