I'm rebuild a Lisa 2/5 and I able to find a MC1489PD, but I'm not able to find a MC1488PD only a MC1488P (no D) is the MC1488P a suitable substitute? Also does anyone know what the thing is below R46? The battery's ate them.
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Lisa I/O board parts
- Thread starter Canby Fat Mac
- Start date
The thing right under the silkscreened R46 is a resistor pack. It is indicated RP4 underneath it in the silkscreen. Here is the info on RP4
Basically, it is just a bunch of 10K ohm resistors.
Also, the Lisa schematics are available at http://lisaem.sunder.net/books.html
Basically, it is just a bunch of 10K ohm resistors.
Also, the Lisa schematics are available at http://lisaem.sunder.net/books.html
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The MC1488/1489 pair are the line receiver/driver for the serial ports. Going by this part of the schematic.
http://lisaem.sunder.net/LisaSchem/Lisa210SysIO3.gif
and the datasheets for the parts
http://www.onsemi.com/pub/Collateral/MC1488-D.PDF
http://www.onsemi.com/pub/Collateral/MC1489-D.PDF
You should be good, just make sure its a DIP package chip.
http://lisaem.sunder.net/LisaSchem/Lisa210SysIO3.gif
and the datasheets for the parts
http://www.onsemi.com/pub/Collateral/MC1488-D.PDF
http://www.onsemi.com/pub/Collateral/MC1489-D.PDF
You should be good, just make sure its a DIP package chip.
I did some searching around, and this is the specific resistor pack you need to order for your Lisa I/O board: http://www.mouser.com/ProductDetail/Bourns/4308R-101-103LF/
