9 May
2013
9 May
'13
3:27 p.m.
I had the bright idea of swapping out a Model 25 board (8086) with a Model
30-286 board, thinking that the boards were exactly the same. They are,
actually, but the Model 30 board comes with a three-slot ISA riser, which
does not fit in the Model 25 case.
Apparently I need the Model 25-286 two-slot riser. I don't want to try
plugging the original 8-bit Model 25 riser in, I fear it will somehow fry
the board.
Does anyone have a riser card they're willing to part with, or know the IBM
part number I need to be looking for?
10 May
10 May
6:50 a.m.
Derek Smith wrote:
I had the bright idea of swapping out a Model 25 board
(8086) with a Model
30-286 board, thinking that the boards were exactly the same. They are,
actually, but the Model 30 board comes with a three-slot ISA riser, which
does not fit in the Model 25 case.
Apparently I need the Model 25-286 two-slot riser. I don't want to try
plugging the original 8-bit Model 25 riser in, I fear it will somehow fry
the board.
Even the 25-286's riser is 8-bit isn't it? It would surprise me if it
wasn't compatible with the 25's riser.
Peace... Sridhar
7:13 a.m.
On 10 May 2013 14:50, Sridhar Ayengar <ploopster at gmail.com> wrote:
Derek Smith wrote:
I am not at all sure - this is dredging ancient memories - but I /think/ so.
IIRC one of the differentiators between the 25-286 and the "proper"
16-bit 286 PS/2 was the 8-bit expansion bus.
--
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I had the bright idea of swapping out a Model 25 board (8086) with a Model
30-286 board, thinking that the boards were exactly the same. They are,
actually, but the Model 30 board comes with a three-slot ISA riser, which
does not fit in the Model 25 case.
Apparently I need the Model 25-286 two-slot riser. I don't want to try
plugging the original 8-bit Model 25 riser in, I fear it will somehow fry
the board.
Even the 25-286's riser is 8-bit isn't it? It would surprise me if it
wasn't compatible with the 25's riser.
8:14 a.m.
Liam Proven wrote:
On 10 May 2013 14:50, Sridhar Ayengar <ploopster at
gmail.com> wrote:
Besides, the 16-bit PS/2s are 16-bit MCA, not 16-bit ISA.
Peace... Sridhar
Derek Smith wrote:
I am not at all sure - this is dredging ancient memories - but I /think/ so.
IIRC one of the differentiators between the 25-286 and the "proper"
16-bit 286 PS/2 was the 8-bit expansion bus.
I had the bright idea of swapping out a Model 25 board (8086) with a Model
30-286 board, thinking that the boards were exactly the same. They are,
actually, but the Model 30 board comes with a three-slot ISA riser, which
does not fit in the Model 25 case.
Apparently I need the Model 25-286 two-slot riser. I don't want to try
plugging the original 8-bit Model 25 riser in, I fear it will somehow fry
the board.
Even the 25-286's riser is 8-bit isn't it? It would surprise me if it
wasn't compatible with the 25's riser. 
12 May
12 May
9:44 a.m.
On 10 May 2013 22:37, Terry Stewart <terry at webweavers.co.nz> wrote:
That's sort of what we're debating here. Are the ISA-based PS/2s 8-bit
or 16-bit? IOW short or longer, 2-part ISA slots?
You could resolve the question - which does yours have?
--
Liam Proven ? Profile: http://lproven.livejournal.com/profile
Email: lproven at cix.co.uk ? GMail/G+/Twitter/Flickr/Facebook: lproven
MSN: lproven at hotmail.com ? Skype/AIM/Yahoo/LinkedIn: liamproven
Tel: +44 20-8685-0498 ? Cell: +44 7939-087884
Besides, the
16-bit PS/2s are 16-bit MCA, not 16-bit ISA.
Peace... Sridhar
Not all of them. My IBM PS/2 30-286 is is ISA-based. 
1:07 p.m.
On 5/13/13 7:45 AM, Sridhar Ayengar wrote:
Terry Stewart wrote:
Doesn't that machine have an 8-bit bus?
Peace... Sridhar
Sridhar, I'm working from memory here, as I gave my Model 25 away,
but I'm fairly certain I had a 16-bit ISA NIC in it.
Remember that's the all-in-one model, and it was Different.
Doc
Besides,
the 16-bit PS/2s are 16-bit MCA, not 16-bit ISA.
Peace... Sridhar
Not all of them. My IBM PS/2 30-286 is is ISA-based.
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doc＠vaxen.net -
lproven＠gmail.com -
ploopster＠gmail.com -
raifield＠gmail.com -
terry＠webweavers.co.nz