| 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 |
| Message Index |
| Next page |
| Previous page |