27 Dec
2005
27 Dec
'05
2:01 p.m.
On Tuesday 27 December 2005 08:20 am, Tony Duell wrote:
The wedge has a socket, too.
I have no idea how (if at all) that appears to CP/M. There is, of course,
an EPROM in the wedge which contains the firmware for the Z80 that
controls the RAMdisk stuff. I asusme you mean a second socket for a user
EPROM.
I
don't think this one has BASIC in it. There are eproms, Portable
WordStar,
Probably not if you have wordstar. There are only 2 EPROM sockets, BASIC
fills an EPEOM, I think wordstar would as well. Another 3.5mm
jack socket 'ADC In'. This is an analogue input to another
channel of the ADC chip, the other connecitons being ground and a
TTL-level trigger signal
It'd be nifty to see if I can find some use for them, once I get it working. A 3.5mm mono jack socket 'SP out' for an
external loudspeaker.
A 50 pin header 'System Bus' which is essentially the unbuffered Z80 bus
lines.
I think that's what the wedge connects to. I *made* that pack, the one that came with it was
shot. I also used to run a
OK, mine came with no battery at all...
retail battery store, and salvaged a whole bunch of
similar connectors from
cordless phone batteries that folks brought in for replacement, and I'm sure
that one of those will work.
As I said, if not, I have a source of replacements. I think they ship
worldwide, but the cost may be fairly high. Incidentally, does anyone
know a (UK, preferably) source of the thin, large heat-shrink sleeving
used round battery packs? Maplin used to sell it, but no more.
Youy have to realise that I have no idea who I am talking to on this
list, I have no idea what your technical skill level is. I'd rather post
some elementary information and risk insulting you than not mention it
and then find I've ruined some rare machine (or worse still have that
machine in as a repair job).
I run mine
from a regulated electornic workbench supply connected in
place of the battery (and set between 4.8V and 5V). I would think the 5V
supply from another computer would be OK (e.g. an old PC power supply),
but I've not tried it, so don't blame me if you kill all the ICs in the
PX8...
I have enough 7805s and similar to deal with that, for sure.