Call for final Elf99 design input

From: Allison J Parent <allisonp_at_world.std.com>
Date: Tue Nov 24 18:07:05 1998

< Options under consideration:
<
< o Sockets for two 1822/2101 256x4 SRAMs, the same style used by
< the original Elf.
<

one 2116 outweighs that.

<o A 1851 programmable input/output port -or- a pair of 4508 latches

Use the one that is available.

< wired as one input and one output port (as in the COSMAC VIP)

Handy and useful, do the ports.


< o A 1854 UART

Desirable.

< o A protoyping area of .1" spaced plated-through holes, nominally
< a few inches long by one or two inches wide.
<
< o Either a dual 4042 address latch or a single 4508 latch. One or
< the other is needed to implement more than 256 bytes of memory.
< This would be optional in a machine built with dual-256x4 SRAMs.

Consider 74hct373.

< o A pre-programmed 27256 with a "library" of simple programs
< (Accessible by enabling the ROM switch, setting the program
< number in the switch register, then setting the control switches
< to "run").

Good idea! I have sources for minimonitor and UT4(RCA) plus a buch of
others in hex from articles.

< Did I miss anything? Any other suggestions? I will not be including sp
< for an 1861 because I have been entirely unable to locate a source.

Long gone.

< Do we still have any interested parties? I have saved the addresses of
< all who have initially expressed interest, so I only really need to know
< these features are attracting people or putting them off.

Yes!

Allison
Received on Tue Nov 24 1998 - 18:07:05 GMT