johnt@meaddata.com (John Townsend) (05/07/91)
I have a Street Electronics "Alphabits II" serial card which up to now I have
been using as a modem interface. Now I want to use it as an interface to an
Imagewriter II, and would like very much to add the 64K "BufferKit" option to
the Alphabits card. I called Street and found out that they don't make the
Alphabits card anymore, let alone the BufferKit, and so I am on my own to get
one.
The BufferKit consists of three chips, which plug into the sockets labeled
U1 BUFFER (40-pin), U2 RAM1, and U3 RAM2 (both 16-pin). I figure that U2 and
U3 are each 256K x 1-bit DRAMS (for a 64K byte buffer) and that U1 is some kind
of PAL or PLA used as an address controller for the RAM (since other size
buffers were also available). Obviously, the DRAMs will be easy to find, but I
need some help with the PAL (I assume). If you have access to an Alphabits II
card with the 64K BufferKit option, can you tell me exactly what chips are
installed in U1, U2, and U3, and (please, please, please!) send me a copy of
the program/mask in U1? Thanks!
--
John Townsend Internet: johnt@meaddata.com
c/o Mead Data Central UUCP: ...!uunet!meaddata!skibum!johnt
P.O. Box 933 Telephone: (513) 865-7250
Dayton, Ohio, 45401whitewolf@gnh-starport.cts.com (Tae Song) (05/12/91)
|I have a Street Electronics "Alphabits II" serial card which up to now I have |been using as a modem interface. Now I want to use it as an interface to an |Imagewriter II, and would like very much to add the 64K "BufferKit" option to |the Alphabits card. I called Street and found out that they don't make the |Alphabits card anymore, let alone the BufferKit, and so I am on my own to get |one. | |The BufferKit consists of three chips, which plug into the sockets labeled |U1 BUFFER (40-pin), U2 RAM1, and U3 RAM2 (both 16-pin). I figure that U2 and |U3 are each 256K x 1-bit DRAMS (for a 64K byte buffer) and that U1 is some |kind of PAL or PLA used as an address controller for the RAM (since other size |buffers were also available). Obviously, the DRAMs will be easy to find, but |I need some help with the PAL (I assume). If you have access to an Alphabits |II card with the 64K BufferKit option, can you tell me exactly what chips are |installed in U1, U2, and U3, and (please, please, please!) send me a copy of |the program/mask in U1? Thanks! | |-- | John Townsend Internet: johnt@meaddata.com | c/o Mead Data Central UUCP: ...!uunet!meaddata!skibum!johnt | P.O. Box 933 Telephone: (513) 865-7250 | Dayton, Ohio, 45401 About U2 and U3, I believe they are two 64Kx4 chips, like the ones used in the GS. The 40-pin chip is a tuffy... but I don't think it's a PAL, since they don't come with that many pins (I could be wrong on this). PALs usually have at the most maybe 28-pins and narrow like RAM chips. Sorry, I couldn be of more help. Maybe if I could get a picture of the thing... INET: whitewolf@gnh-starport.cts.com UUCP: crash!gnh-starport!whitewolf ARPA: crash!gnh-starport!whitewolf@nosc.mil