Re: New Pile of Mystery Boards

[labelas@hotmail.com (Labelas Enoreth)]

Alright, hate to break in here but since all of you seem so competant with
chip IDing...anyone have any ideas on these?
> N82S09I 7931  (Gray, with square black module in center) (28 pins)
> 12500I-02 (3 marked 7915AY,  1 marked 7928AR) (White with gray 'lines'
> to the pins, with square black module in center. Gold pins. Small Z on
> right edge of chip. 40 pins)
> SN74S511 (14 pins)
> SN74S861 (14 pins)
> SN74S001 (14 pins)
> N82S16F (16 pins)

In article <1dqa03f.zbe3egy70934N@dempson.actrix.gen.nz>,
dempson@actrix.gen.nz (David Empson) wrote:

> Jeff Lemke <lemke@terra.cira.colostate.edu> wrote:
> 
> > Seb wrote:
> > > 
> > > Jeff Lemke wrote:
> > > >
> > > > 5.  IIEasy RAM Memory Upgrade, Copyright 1989 by PaceMark Technologies,
> > > > Inc.  Very small board the size of a business card, on red baseboard.
> > > > Only 4 chips, plus some resistors.  How much RAM was this?
> > > 
> > > What's written on the chips?
> > 
> > Sorry for the long time in responding.  The two chips on the left are
> > labled "P21464-10" on the first line, "K047 KOREA" on the second line.
> 
> These are RAM chips, each of which contains 64K by 4 bits.  As a pair,
> this gives you 64K bytes.
> 
> > The two chips on the right are labled differently from each other.  One
> > has "SN74LS374N" on the first line and "XXAB9212" on the second line.
> > It's a Motorola chip.
> 
> This is an 8-bit latch (actually an 8-way D-type flipflop), probably
> used to hold part of the address or the data being written to or read
> from the RAM.
> 
> > The other chip on the right is labled "Thailand", then a big "S", then on
> > three lines is written "74LS245N", "FKN2486", and "9148VF" respectively.
> 
> This is an 8-bit buffer, probably used to isolate the data bus on the
> card from the motherboard.
> 
> Sounds like a IIe auxiliary slot 64K RAM card to me.
> 
> -- 
> David Empson
> dempson@actrix.gen.nz
> Snail mail: P.O. Box 27-103, Wellington, New Zealand