[abc80] Super Smartaid Cartridge

[Anders Sandahl]

I'll bet that all the circuits turns out to be the same as on the magnum
version. The board it self looks the same, the patches are different.
Different sizes on one of the ERPOM's and a piggybacked 74ls74 on one
place.

Compare
https://www.abc80.net/archive/luxor/pictures/smartaid/smartaid-magnum-4-component.jpg
with
https://www.abc80.net/archive/luxor/pictures/smartaid/super-smartaid-component.jpg

Note that the circuits are not sanded of on the magnum board. I also think
the layout is just the same on Mikkels board.

/Anders

> On 4/23/19 12:17 PM, Mikkel Christensen wrote:
>>
>> The yellow bricks ... any idea what they are? You can zoom in on them
>> here:
>>
>> https://www.mikjaer.com/pics/IMG_3761.JPG
>>
>> It says 100nM63
>>
>> is that capacitors?
>>
>
> Yes; almost certainly used as decoupling capacitors on the power supply
> (near each IC) to reduce noise.
>
>> Finally i discovered that some of the scripts has silkscreens on the
>> bottom?
>>
>> https://www.mikjaer.com/pics/IMG_3757.JPG
>>
>> Can we use that to figure out what they are?
> They are probably lot numbers and are unlikely to be very meaningful.
>
> The two large chips on the left are 8K (top) and 2K (bottom) EPROMs; I
> bet reading out their contents will tell a *lot* about how the rest of
> the board is set up.
>
> Given the era, it is likely a simple 2-layer board, which would make it
> possible to trace the connections; that would add even more clues.
>
> I am willing to bet good money that the 14- and 16-pin chips on the
> right are at least mostly 74LS or possibly 74S series chips; it is
> *possible* some of them might be 4000 series CMOS chips used to build a
> real time clock or similar; if so, those chips would be fed off the
> battery.
>
> On 4/23/19 12:21 PM, Mikkel Christensen wrote:
>> This one:
>>
>> https://www.mikjaer.com/pics/IMG_3757.JPG
>>
>> Seems to be this one:
>>
>> https://www.alibaba.com/product-detail/Original-New-ic-SN74LS245N-DIP-74_60600814878.html?spm=a2700.7724857.normalList.89.361690f6MR2dEb
>>
>
> Oh, you're right... it says LS245 and I didn't think that that was
> simply a 74LS245. That is an 8-bit bus transceiver, that is a buffer
> that can be turned in either direction; it would naturally be used to
> connect to the data bus lines.
>
> There is enough writing still left on the big chip in the middle that it
> is clearly a 6116 series (2Kx8) CMOS RAM.
>
> Incidentally, for details on chips still in production I usually go to
> digikey.com and search, because you can get the data sheets directly
> from there.
>
> 	-hpa
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