Re: SFD-1001 RRIOT chip's

From: Rob Clarke <>
Date: Mon, 17 Sep 2012 00:18:08 +0200
Message-ID: <>
Thanks Christian, thanks Wolfgang - that's great news. I'll dig an old 
4040 out of the attic tomorrow.


On 16/09/2012 23:37, Wolfgang Moser wrote:
> Hello Rob and Christian,
> yes, within the SFD's daugtherboard every CBM floppy drive RRIOT (6530)
> can be used as a replacement. This is because the address decoder logic
> is programmed the very same for all of Commodores CBM series floppy disk
> drives.
> If someone gets a hand on some superfluous such dautherboards, he might
> be able to repair even other CBM floppies, not only SFD ones. ALl that
> needs to be done is to place the correct ROM contents into the
> additional ROM.
> Womo
> Christian Dirks schrieb:
>> Hi Rob,
>> AFAIK any RRIOT from another CBM drive can be used with the daughterboard.
>> Christian
>> Am 16.09.2012 21:00, schrieb Rob Clarke:
>>> Good evening Gentlemen,
>>> Tonights mini-project is repairing a second SFD-1001 which I've had on
>>> the 'to-do' list for 18 months now. The problem was quickly tracked to
>>> a failed RIOT chip. As this sits on a daughterboard with the external
>>> ROM, can any RRIOT chip from a CBM IEEE drive be used as a replacement?
>>> My understanding was that there were other aspects of the chip which
>>> were mask programmable to determine where the RAM and ROM were located
>>> in the address space, but were these ever different across the IEEE
>>> RRIOT chips?
>>> Cheers,
>>> Rob
>>>        Message was sent through the cbm-hackers mailing list

       Message was sent through the cbm-hackers mailing list
Received on 2012-09-16 23:00:30

Archive generated by hypermail 2.2.0.