help with my EIA combo board
The QRPer
k2ph at cbnewsj.att.com
Tue Mar 19 07:38:47 AEST 1991
>From article <638 at av8tr.UUCP>, by elliston at av8tr.UUCP (Keith Elliston):
> Hello
>
> I recently posted about problems with my 7300 (av8tr), and have decided
> to take some of the advice. So, I took out my 512K expansion boards (2),
> populated the EIA combo with 1.5, and thoroughly cleaned out the machine
> (the infamous Dust Bunny treatment). I also made sure all my connections to
> the powersupply and disk were good.
>
> One problem so far... I don't know how to configure the jumpers on the
> combo board for 1.5 Mb. I only get 0.5 out of it. So, could some kind
> soul tell me how to configure the board for 1.5? I installed 36 addtn'l
> 256k/80ns chips on the board.
>
> Thanks
>
> Keith
>
>
> --
> Keith O. Elliston elliston at av8tr.UUCP elliston at msdrl.com
> AA5A N9734U elliston at mbcl.rutgers.edu elliston at biovax.bitnet
> "Beware of pseudo-experts with a mission and a grudge, especially if they are
> lawyers pretending to be scientists." -- H.W. Lewis in 'Technological Risk'
Here's the table from the EIA/RAM Combo Board Installation Guide:
RAM W1 W2 W3 Rows Populated with ICs
-------------------------------------------------------
0.0 OFF OFF OFF NONE
0.5 OFF ON ON 5 and 6
1.0 ON OFF ON 7 through 10
1.5 ON ON OFF 5 through 10
It really works. I upgraded mine in steps, so I know that these
jumper settings work.
--
=========================================================================
Bob Schreibmaier K2PH | UUCP: att!oblivion!k2ph or k2ph at oblivion.att.com
AT&T Bell Laboratories | ARPA: k2ph%oblivion at att.arpa
Lincroft, N.J. 07738 | ICBM: 40o21'N, 74o8'W
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