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Re: New dumps [Re: rfka01] #112201
01/16/18 11:57 AM
01/16/18 11:57 AM
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Sydney, Australia
Vas Crabb Offline
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Originally Posted by rfka01
The oscillator is labeled 4194.304 kHz.

Thanks. Interesting that the oscillator/clock divider chip is nowhere near the crystal. You'd think that would be a recipe for instability.

Re: New dumps [Re: Darkstar] #112202
01/16/18 01:10 PM
01/16/18 01:10 PM
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Vas Crabb Offline
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Sorry to be a pain, but can you measure voltages and/or frequencies on the board while it's running, or measure continuity? I'm interested in what's going on with the clock generator chip - the Intel P4201A (16-pin chip near the big D4289 8-bit memory controller).
  • If you can measure voltages, check the voltage on pin 5 with respect to pin 15
  • If you can measure frequencies, check the frequency coming out on pin 3 (MOS compatible) and the crystal frequency on pin 7 or pin 8
  • If you can measure continuity (with the machine off), check whether pin 5 is connected to pin 15 or pin 4

Re: New dumps [Re: Darkstar] #112203
01/16/18 01:37 PM
01/16/18 01:37 PM
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Posts: 914
Bavaria
rfka01 Offline
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The voltage regulators and several Tantals look shot so I can't / dare not turn it on in this state.

On the P4201A, pin 5 and 15 are connected.


NCR DMV- DEC Rainbow- Siemens PCD- ITT 3030-Oly People- Acorn A5000- Olivetti M20
Re: New dumps [Re: rfka01] #112204
01/16/18 03:28 PM
01/16/18 03:28 PM
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Sydney, Australia
Vas Crabb Offline
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Originally Posted by rfka01
On the P4201A, pin 5 and 15 are connected.

OK, we know it's in divide-by-seven mode anyway. Let's assume it's used to generate the CPU clock.

Re: New dumps [Re: Darkstar] #112506
02/06/18 04:59 AM
02/06/18 04:59 AM
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Posts: 1,678
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Just Desserts Offline
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Would someone be so kind as to add this dump from a Casio SK-1 to MAME, so that it doesn't get lost? https://spun.io/wp-content/uploads/2018/02/sk1-rom-raw.zip

Re: New dumps [Re: Just Desserts] #112507
02/06/18 05:21 AM
02/06/18 05:21 AM
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Sydney, Australia
Vas Crabb Offline
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Originally Posted by Just Desserts
Would someone be so kind as to add this dump from a Casio SK-1 to MAME, so that it doesn't get lost? https://spun.io/wp-content/uploads/2018/02/sk1-rom-raw.zip

I'll add it. MSM6283 apparently.

Re: New dumps [Re: Darkstar] #112537
02/08/18 06:17 PM
02/08/18 06:17 PM
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Posts: 500
Bradford, UK
incog Offline
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Re: New dumps [Re: incog] #112538
02/08/18 07:20 PM
02/08/18 07:20 PM
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Stiletto Offline
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Last edited by Stiletto; 02/08/18 07:21 PM.
Re: New dumps [Re: Darkstar] #112539
02/08/18 07:38 PM
02/08/18 07:38 PM
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Posts: 500
Bradford, UK
incog Offline
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If they did provide it, which i assume so too, it's not linked on their site.

Re: New dumps [Re: incog] #112542
02/08/18 09:37 PM
02/08/18 09:37 PM
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Stiletto Offline
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Originally Posted by incog
If they did provide it, which i assume so too, it's not linked on their site.


I thought it might be inside the SDK - but it seems not. Indeed, it is not leaping out at me right now.

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