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Title: SID 6581 in on-board free EPROM socket?
Post by: MIRKOSOFT on January 30, 2011, 02:35 AM

Hi!

I found old C128 flat motherboard.

There was in free EPROM socket (U36) inserted MOS 6581.
Seems it that this mainboard used two SIDs for STEREO SID? ???

It seems unreal, but what's the function of SID in U36 socket? ???

Many thanks for every reply.

Cheers,

Miro

Title: Re: SID 6581 in on-board free EPROM socket?
Post by: RobertB on January 30, 2011, 03:36 PM

Quote from: MIRKOSOFT on January 30, 2011, 02:35 AM
There was in free EPROM socket (U36) inserted MOS 6581.

Seems it that this mainboard used two SIDs for STEREO SID?

It seems unreal, but what's the function of SID in U36 socket?

No, that sounds impossible. I can't see how a 6581 can function in the empty socket of a C128. Someone must have put that extra SID in there, because he/she didn't know what to do with it (or wanted a place to store it). :)

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Title: Re: SID 6581 in on-board free EPROM socket?
Post by: BigDumbDinosaur on January 30, 2011, 04:11 PM

As the MPU's R/

W[/o] line is not connected to the internal ROM socket it would be impossible to drive the SID.[/size][/font]

Commodore 128 Alive!

Commodore 128 => Herdware => Topic started by: MIRKOSOFT on January 30, 2011, 02:35 AM