Date   : Wed, 02 Mar 2016 19:26:57 +0000
From   : djameson@... (Daniel Jameson)
Subject: BBC Master not 'seeing' SCSI Host Adapter

IC15...  Do you have a scope? Can you check whether /EXFC is going low when
you're accessing that address?

d.

On 2 March 2016@..., Steven John BASS <essjaybass@...> wrote:

> Hi Guys
>
> I've recently moved house so have just got around to connecting my BBC
> Master.  Had to change the CMOS battery but once done it fired up.
>
> However when I came to connect my SCSI Hard Drive it could not be accessed
> as every time I performed a *MOU.0 it accessed the floppy drive.
>
> Suspecting the Host Adapter I changed it using several spares but each one
> didn't work.  Thinking they can't all be faulty I now suspected the 1MHz
> bus.  I then performed the following command - PRINT ~?&FC41.  It should
> return &00 but gave &FF.
>
> I thus thought that the 1MHz bus was faulty so connected my HCR Electronics
> Eprom blower and was able to read an EPROM with the correct checksum.
>
> I suspect that Page &FC is not being selected but I'm puzzled as to what to
> look for next.
>
> Any ideas and suggestions would be appreciated.
>
> --
> Steve
>
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