[comp.sys.cbm] 1764 -> 2megs+

shikascs@clutx.clarkson.edu (Glo) (03/20/90)

 o Does anyone know how the 1764 can be expanded to 2megs or more?

 o What is the directory limit on a 1764 using the latest version of RAMDOS?
    (number of entires per REU)

                                      Thanks in advance again,  Glo

The Flying Circus BBS

(2) 1541's
(1) 1764 (512k)
(1) 1571
(1) old 64
(1) Color64 with Network
(1) 1670 w/ reset switch

jgreco@archimedes.math.uwm.edu (Joe Greco) (03/20/90)

In article <1990Mar20.053409.5057@sun.soe.clarkson.edu> shikascs@clutx.clarkson.edu (Glo) writes:
> o Does anyone know how the 1764 can be expanded to 2megs or more?

No, but I am seeking enlightenment in this area myself.  I would hazard a
guess that the 2meg limit is a limitation on how many RAM chips can be put
on the 17xx PCB rather than a limitation of the technique...

> o What is the directory limit on a 1764 using the latest version of RAMDOS?
>    (number of entires per REU)

Last time I tried, it was well in the thousands (RAMDOS 3.2, which has been
superseded).  Try it:
for a=1 to 999999:open 2,31,2,"0:file"+stR(a)+",s,w":close2:print a:next
and notice that things slow down as there are more entries.

I believe the ultimate limit would probably be 2^16 entries, although
I could be wrong.  I believe it is safe to say that this is not a point
that needs to be considered for most applications  :-)  Seems to be more
of a function of available RAM.

... Joe

jgreco@archimedes.math.uwm.edu (Joe Greco) (03/20/90)

> I need them to expand my 1764 to 2MB.  For details on how to do
> this, I have just sent the instructions to  the UX-Maze server.  I am about to
> send it to the UX-Mail server and the FTP sites, as well.

I'd sure like to see this.  As would a few other people, from what I've heard.

I looked through UX-Maze and didn't see anything.

... Joe