I'm splitting this into a new thread from my A3000 + Hard Disc thread
to maintain on-topicness. Still new to this group so I'm not sure if
this is normal / approved / frowned upon. Go easy on me if I'm
out-of-line m'kay? ;-)

Here's the relevant info from the old thread:

Austin Pass <aus...@ozpass.co.uk> wrote:


See RTR12 at:
http://www.drobe.co.uk/archives//ww...AFF/A.Wiseman/A...


Lots of technical documents including links to the A3000 TRM and podule

specs can be found on my page:
http://www.markettos.org.uk/riscos/techdocs.html


Theo

======my response======

Thanks Theo.

That link to the Run the Risc article seemed to refer to "A real time
clock calibrator. A radio receiver picking up the time transmissions
from Rugby. This uses a Maplin kit, catalogue number of LP70M priced at
£23.99 in the latest catalogue." - am I missing something?

I did find a copt of the A3000 Technical Reference Manual - perfect! I
found the pinouts for the internal and external expansion. My question
is, do I just connect together the similar pins using a wire wrapped
mockup?

Here are the pinouts of the two interfaces:

Internal Expansion Bus

Pin. No. SK3 SK11 SK8 SK9
1 +5v 0v C[0] 0v
2 PWE* +5v C[1] REF8M
3 PS1* PRE* BI* PFIQ*
4 CLK2 PR/nW IORQ* Ms[1]*
5 LA[2] LA[4] IOGT* +5v
6 LA[3] LA[5]
7 BD[0] LA[6]
8 BD[1] LA[7]
9 BD[2] 0v
10 BD[3] LA[8]
11 BD[4] LA[9]
12 BD[5] LA[10]
13 BD[6] LA[11]
14 BD[7] LA[12]
15 RST* LA[13]
16 0v PIRQ
17 +5v 0v

External Expansion Bus

Pin Row(a) Row(c) Description
1 0v 0v Ground
2 LA[15] res
3 LA[14] 0v Ground
4 LA[13] 0v Ground
5 LA[12] res
6 LA[11] MS[0]* MEMC Podule select
7 LA[10] res
8 LA[9] res
9 LA[8] res
10 LA[7] res
11 LA[6] res
12 LA[5] RST* Reset
13 LA[4] PR/W Read/not write
14 LA[3] PWE* Write strobe
15 LA[2] PRE Read strobe
16 BD[15] PIRQ* Normal Interrupt
17 BD[14] PFIQ Fast interrupt
18 BD[13] S[6]*
19 BD[12] C1 I2C Serial Bus Clock
20 BD[11] C0 I2C Serial Bus Data
21 BD[10] S[7]* External Podule Select
22 BD[9] PS[0] Simple Podule Select
23 BD[8] IOGT* MEMC Podule Handshake
24 BD[7] IORQ MEMC Podule Request
25 BD[6] BL* I/O data latch control
26 BD[5] 0v Supply
27 BD[4] CLK2 2Mhz Synchronous clock
28 BD[3] CLK8 8Mhz Synchronous clock
29 BD[2] REF8M 8Mhz Reference clock
30 BD[1] +5v Supply
31 BD[0] res
32 +5v res

I'm no electronic engineer, so I don't understand the above, probably
never will. I cab solder quite competently though. So my question is
this, do I simply connect like-for-like matching what I can between the
two interfaces, e.g. BD[10] connected to BD[10], LA[6] connected to
LA[6] etc.?

Does anybody who has attempted this have anything to add?

Thanks in advance.

-Austin.

Austin Pass <austinpass@gmail.com> wrote:

That's OK - means those who are interested can find it, rather that delving
into the depths of an old thread that has drifted.

(I've tweaked your quoting a bit to make it clear who said what in the
conventional way)


Yes! I'm getting my numbers confused! I think it was RTR9 that talks about
fitting an AKA12 MIDI card to a Risc PC. If you ignore the specifics about
the MIDI card then it should apply to most podules.


Yes, pretty much. You can ignore C[0] and C[1], and attach PS[0] (RPC) to
PS[1] (minipod) and MS[0] to MS[1]. BI* should be BL* (I think you've made
a typo there).


I can't see anything that's not a straight-through connection, bearing in
mind the minipodule is a subset of the full podule spec so don't worry about
wires on the full podule not connected. Ask if there's any you find that
don't match up.

Probably the biggest problem might be the physical size - connectors on the
minipodule will be mounted sideways on when fitted to a RPC, and the board
might need a little shaving to get it to fit in the space.

Theo

--
Theo Markettos theo@markettos.org.uk
Clare Hall, Cambridge atm26@cam.ac.uk
CB3 9AL, UK http://www.markettos.org.uk/

Theo Markettos <theom+news@chiark.greenend.org.uk> wrote:

I failed to read that you wanted it to go in the external slot not the Risc
PC - me being thick. The principle is the same, though you have a bit more
physical space to play with.

Note the software authors might have been being lazy and hardcoded the
podule number (0) into the software, but that's a risk you'll just have to
take. I've hacked various modules to look in different podule slots, so if
your ARM assembler is up to it it might not be the end of the world.

Theo

On 27/9/06 12:03, in article JQj*LAPrr@news.chiark.greenend.org.uk, "Theo
Markettos" <theom+news@chiark.greenend.org.uk> wrote:


I've made up the little board. Fiddly as hell running the wires!

The only one that I couldn't find a home for on the external expansion bus
is SK3, pin 3 "PS1*" according to the technical reference manual.

The board doesn't work. Plugged in I get a black middle and very dark blue
border. When I hold down delete when starting up I get a cyan border and
black/white pinstripe middle (in case that means anything!!).

I've checked all the other pin assignments. I'll post up what I connected
where tomorrow when I can see straight again!!!

Thanks for all your help, Theo.

-Austin.

In article <C1408FE9.79EF%austin@ozpass.co.uk>,
Austin Pass <austin@ozpass.co.uk> wrote:

There is some information on what the different coloured error screens and
the flashing floppy disk light error messages during the 'power on self
test' mean in the comp.sys.acorn.FAQ part2 question4.3 which Paul Vigay
maintains at http://www.vigay.com/csafaq/ and posts each month to
c.s.a.misc newsgroups etc.

Alan

--
--. --. --. --. : : --- --- ----------------------------
|_| |_| | _ | | | | |_ | alan.dawes@argonet.co.uk
| | |\ | | | | |\| | | alan.dawes@riscos.org
| | | \ |_| |_| | | |__ | Using an Acorn RiscPC

Austin Pass <austin@ozpass.co.uk> wrote:

PS1 is 'podule select'. It's the most vital signal on the podule bus as
without it your podule won't do anything! If it's floating, worse will
happen since your podule will come alive when it's not wanted! This is
probably the cause of the machine failing to boot.

You should connect it to PS on the podule bus, that's pin c22.

Theo

On 29/9/06 12:45, in article DGh*Ch0rr@news.chiark.greenend.org.uk, "Theo
Markettos" <theom+news@chiark.greenend.org.uk> wrote:


You sir, are a genius!

Works a treat! Comes up as Podule 0, good as gold. I have the T-pieces,
terminators and coax cable. Just need an old RTL8029 for my PC and I've got
an internet connected A3000! Yay!

-Austin.