Electronics > Projects, Designs, and Technical Stuff

Found a weird old computer dumpster diving. (z80?)

<< < (4/10) > >>

tsvisimcha:
Not sure if it's clear from the pictures but the nvram and the z80 are both socketed

james_s:
There's not going to be any high voltage in that beyond the mains voltage, the capacitors are physically big but they are almost certainly just filters on a linear power supply, I'd be very surprised if any are rated over 50V and the actual voltages on them will be lower.

MLXXXp:
U8, under the speaker, is a AY38912 sound generator. I can't quite read the number on U6 but it's probably an audio amplifier, like a TDA2002, to drive the speaker from the signal from the sound generator IC.
http://pdf.datasheetcatalog.com/datasheets2/54/545148_1.pdf
http://pdf.datasheetcatalog.com/datasheet/SGSThomsonMicroelectronics/mXyzxrtt.pdf

So, probably the only RAM is U27, which is a 2K x 8 static RAM with a lithium backup battery
http://www.greenwichinst.co.uk/datasheets/GR281.pdf

T3sl4co1l:
Yeah doesn't seem to have much RAM. Could be other stuff on that (likely) bus connector though. How many boards in the whole thing?

Tim

Gyro:
I wonder what was behind NS feeling the need to print "PATENTED" quite so prominently on a simple UART (16550)  back in 1994, they were commodity parts by then.  :-//

Navigation

[0] Message Index

[#] Next page

[*] Previous page

There was an error while thanking
Thanking...
Go to full version
Powered by SMFPacks Advanced Attachments Uploader Mod