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amsbom.txt
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2008-01-08
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--- In swpb@yahoogroups.com, "Ksarul" <vze23g4a@...> wrote:
Here it is again. I posted this once before.
Here's the list of components:
I bought mine from Unicorn Electronics, as they had the best prices
overall.
www.unicornelectronics.com
You need the following components and sockets:
Item Quantity P/N
14 pin socket 5 each MT14
16 pin socket 2 each MT16
20 pin socket 5 each MT20
32 pin socket 2 each MT32
40 pin socket 1 each MT40
+5V Regulator, 1 Amp 1 each 7805T
.1mf 50V monolithic cap 4 each CPM.150
100mf 16V radial electrolytic cap 1 each CPE10016
47mf 16V radial electrolytic cap 1 each CPE4716
Memory Mapper Chip 1 each 74HCT612
Octal Bus Transceiver 1 each 74HCT245
8-bit Magnitude Comparator 1 each 74HCT688
Octal Driver 3 each 74HCT244
Quad 2-input AND Gate 1 each 74HCT08
8-bit Addressable Latch 1 each 74HCT259
Hex Inverter 1 each 74HCT04
Quad 2-input OR Gate 1 each 74HCT32
3 to 8-line Decoder/De-multiplexer 1 each 74HCT138
Quad Bus Buffer Gate 1 each 74HCT125
Note also that C-1 is the 47mf cap and that C-3 is the 100mf cap,
and that the four .1mf caps are not marked--you just have to find their pad
pairs.
It is best to use a photo of a completed card to see where those
four are.
Choose your memory chips separately, either 128K or 512K, I didn't
list those above.
Jim Fetzner
==
James M. Postle, Sr.
Voltage is just as important for the Capacitors as is their value and
type. The C-1 -- "If" handling the input voltage (17 Volts) should
be 35 Volts. The C-2 is working with 5 Volts, then a 10 Volt device
would work. There are different types of capacitors. And... That
should be specifide in the parts list as well. That would include
the .1mf filters. Four, I think. Or... A part number would work as
well.
So this list is not totally complete as posted.
NOTE:
1. that C-1 is the 47mf cap and;
2. that C-3 is the 100mf cap, and;
3. that the four .1mf caps are not marked--you just have to find
their pad pairs.
====
Richard Bell Adds:
Some thoughts;
Caps should be 35 v rated and a few should be tantalum instead of
electrolytic (Especially if the LED circuit is added.).
Machine sockets should be used instead of the cheaper "slide" type.
To really make this card shine, memory chips should be the 55 nano second
speed (Also, either the simple P-Box interface card upgrade of replacing the
74LS244 chips with 74HCT244 chips and installing new 35 v rated electrolytics or
Thierry's P-Box wait state reduction mod will help performance).
Someone should make up disks of all the Bruce Harrison software that was
written for this card for a demonstration that will dazzle even the most
hardened TIer so it can be included in the package.