Date   : Wed, 02 Mar 2016 20:01:02 +0000 (GMT)
From   : sai2791@... (Steve Inglis)
Subject: BBC Master not 'seeing' SCSI Host Adapter

Hi, you said your CMOS was reset, did you remember to setup ADFS to use the
hard disk (*CONF. HARD)

Just something to try before breaking out the tools.

On Mar 02, 2016,@07:27 PM, Daniel Jameson <djameson@...> wrote:

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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