Date   : Tue, 11 Feb 2014 23:30:42 +0000 (WET)
From   : bbcmicro@... (Peter Coghlan)
Subject: Paged ROM board

>
>Yes, it's a sideways ROM board for a Beeb, though yours is missing the
>pins.  I wrote a review of one for the Micrognome pages back then, and
>I've still got that board.  It's moderately awful.  The pins go into the
>6502 socket, which, the pins being too big, it destroys.  Or at least
>makes unfit to be returned to normal use.  They weren't very reliable.
>We called them surfboards.  I guess if you were to fit decent dil pins
>(not wirewrap pins, which is what Sir Computers used) it might not be
>too bad.  Mine has the same ICs but fewer links and is a slightly
>different layout, with a wire-wrap socket where SKT1 is on yours, and
>that's what goes into the 6502 socket on the Beeb.  Yours seems to be a
>little later.
>

Thanks Pete.

Even though it looks quite nice, I had a suspicion somewhere in the back
of my head that there might be something awful about it.

I can't figure how it is supposed to fit into the Model B case with pins
descending from either IC23 or SKT1.  Looking at the Issue 7 boards I have,
the sideways ROM board would foul against the power supply and/or the keyboard
connector unless the pins go diagonally or something! I wonder if other issue
boards are significantly different?

There is no sign that SKT1 is a chopped off wirewrap socket so they might
have changed the method for connecting it to the Beeb in response to problems.

I wonder would it be reasonable to fit a socket in the IC23 position to hold
the 6502 and using a short ribbon cable with 40pin DIL header plugs (if such
things can be obtained) to link SKT1 to the CPU socket in the Beeb?

>
>The label on mine is where your IC73 is, and is black vinyl with a
>caricature of a top hat and an eye, and the legend:
>
>SUPPLIED BY
>SIR COMPUTERS
>91 WHITCHURCH ROAD
>CARDIFF
>TEL: (0222) 21341
>            621813
>

Mine might have once had a label that got lost before I rescued it from
wherever I got it. (There is no text at all on the back.)

Regards,
Peter Coghlan.