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Icky - Progress

Where Alpha builders can post pics and progress etc
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PhilC
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Re: Icky - Progress

Post by PhilC »

reading the wd1772 datasheet it says that 20 is used to enable the spindle. This is staying high when it gets to desktop.

Do you know what /CS should be doing? it pulses low once on 80ns scale
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exxos
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Re: Icky - Progress

Post by exxos »

I don't know what timings anything has really.. you would have to check on a working ST and compare them all.

The ST does poll the drive like twice a second or something.. so likely CS goes low during those times.
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TheNameOfTheGame
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Re: Icky - Progress

Post by TheNameOfTheGame »

Maybe my memory is foggy, but I always thought the drive would be damaged by plugging the cable in upside down. Something about voltages on the wrong pins that way. :?:
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Icky
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Re: Icky - Progress

Post by Icky »

exxos wrote: Thu Sep 27, 2018 4:23 pm
exxos wrote: Thu Sep 27, 2018 10:24 am It might be worth scoping out some pins around ACIA area, such as (U54) A1 pin 11, A2 pin 8, (U32) pin 3 SNDCS.. (IC2 MFP) pin 48 CS.
Back to the plot...
Wow I go off grid for a day and see what happens. Great discussion on floppy controllers and drives though.

I’ll take a look at scoping out the signals later tonight.
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Icky
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Re: Icky - Progress

Post by Icky »

TheNameOfTheGame wrote: Thu Sep 27, 2018 7:13 pm Maybe my memory is foggy, but I always thought the drive would be damaged by plugging the cable in upside down. Something about voltages on the wrong pins that way. :?:
I have stuck drive cables in the wrong way many a time on an ST. I haven’t had one damaged but I could just be lucky.
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PhilC
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Re: Icky - Progress

Post by PhilC »

Same for me and usually the drive light staying on is a key to it being the wrong way round (on a pc at least!)
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Icky
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Re: Icky - Progress

Post by Icky »

Forgottenmyname wrote: Thu Sep 27, 2018 7:18 pm Same for me and usually the drive light staying on is a key to it being the wrong way round (on a pc at least!)
Funny was about to say that’s my rule of thumb :)
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Re: Icky - Progress

Post by Icky »

Well joystick port works - have been playing Xenon II :)

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Re: Icky - Progress

Post by Icky »

exxos wrote: Thu Sep 27, 2018 10:24 am It might be worth scoping out some pins around ACIA area, such as (U54) A1 pin 11, A2 pin 8, (U32) pin 3 SNDCS.. (IC2 MFP) pin 48 CS.
In order on the scope as per your pins above:

(U54) A1 pin 11 - CH1, A2 pin 8 - CH2, (U32) pin 3 SNDCS - CH3, (IC2 MFP) pin 48 CS - CH4

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Re: Icky - Progress

Post by exxos »

Ah, you need to be on 5v/div on each... Also hold down a key to trigger sounds and acia...
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