At 12:08 AM 7/24/04 +0000, you wrote:
>On Fri, Jul 23, 2004 at 04:16:01PM -0700, Dwight K. Elvey wrote:
>> A number of people slapped lables on AIM-65's. I have
>> a box similar to this with a few extra boards added that
>> is AIM-65 based as well.
>> What other than the shell is non-AIM-65 ??
>
>Me, too... mine came with a board loaded with EPROMs mounted _under_ the
>AIM-65 motherboard.
I took this one apart this morning. It has two cards under the AIM-65
board. I haven't looked close but one of them appears to be an A/D card.
The other has 24 2114 RAM chips on it along with two 74154s.
I posted pictures of it at <
http://www.classiccmp.org/hp/cybex/>.
>
>Oh... a little tip - I have proven that the 6520 on the display board can
>be replaced with an 6821 (I have a number of 6821s since they were used to
>drive the printer port and the diagnostic display for the original COMBOARD
>model).
That's good to know. Can a 6821 simply be dropped in it's place or does
it require any other changes?
>
>I have more than one AIM-65 at home, but only one display board. One of my
>projects is to fabricate a replica on perfboard. Mostly via eBay, I've
>managed to pick up a few of the 4-char ASCII displays that are on that board.
I've seen a lot of displays around that look like these. I should pick up
some for spares.
>Barring that, I was thinking about using some modern ASCII displays that I
>picked up for a couple $$ each from BG Micro, and re-writing the relevant
>ROM code. Obviously, direct replacement is simpler.
>
>-ethan
>
>--
>Ethan Dicks, A-130-S Current South Pole Weather at 23-Jul-2004 24:00 Z
>South Pole Station
>PSC 468 Box 400 Temp -87.0 F (-66.2 C) Windchill -137.6 F
(-94.2 C)
>APO AP 96598 Wind 18.5 kts Grid 006 Barometer 665.5 mb (11176.
ft)
>
>Ethan.Dicks_at_amanda.spole.gov
http://penguincentral.com/penguincentral.html
>
Received on Sat Jul 24 2004 - 10:55:52 BST