Date   : Sat, 28 Feb 2004 13:06:26 +0100 (GMT)
From   : Johan Heuseveldt <johan@...>
Subject: Re: Unknown chip

Hi all,

On Sun 15 Feb, I, Johan Heuseveldt wrote:

[snip]

> Because it's 24 pins I don't expect it to be in SWR format, and therefor
> will not be recognised at all.

Defenitely wrong here. It /was/ recognised in a BBC-B:

If you like you can download a picture from my web site to see the ROM in a
Beeb and link S33 set for it:

  <http://www.waarland.demon.nl/4K+S33.jpg>  (about 110K)

Note that link S33 is set to position EAST, instead of WEST as can be seen
at
link S32, which is the normal position.

And at last I Managed to get the ROM image on an ARM machine.
The dump has the following start:
(offsets truncated to fit the line)

0000 : 4C 43 80 4C 7C 80 C0 34  00 45 6C 65 63 74 72 6F : LC=80L|=80=C04.El
ectro
0010 : 6E 20 45 78 70 61 6E 73  69 6F 6E 7F 7F 7F 7F 7F : n Expansion.....
0020 : 7F 7F 7F 7F 7F 7F 7F 7F  7F 7F 7F 7F 7F 0B 0B 00 : ................
0030 : 31 2E 30 30 00 28 43 29  31 39 38 34 20 41 63 6F : 1.00.(C)1984 Aco
0040 : 72 6E 00 A0 AA 20 DD 85  86 00 84 01 A6 F4 BD 64 : rn.=A0=AA =DD=85
=86.=84.=A6=F4=BDd
0050 : 80 30 21 AA A8 B1 00 2A  10 F4 A9 8E A0 00 20 F4 : =800!=AA=A8=B1.*.
=F4=A9=8E=A0. =F4
0060 : FF 4C 61 80 0B 00 01 02  03 04 05 06 FF FF FF 0A : =FFLa=80........
=FF=FF=FF.
0070 : 07 0C 0D 0E A9 3F 20 EE  FF 4C 79 80 08 AA E0 16 : ....=A9? =EE=FFLy
=80.=AA=E0.
0080 :

The size was recognised as 8K, but half the image, the header is
repeated, so it is a 4K ROM.

Thanks all of you who had contributed in this thread, and
solved the puzzle!


greetings,
Johan

-- 
Johan Heuseveldt <johan@...              >
  aka  waarland

  The best place is a Riscy place
 
There are very few personal problems which can't be
solved by a suitable application of high explosives.