Path: utzoo!utgpu!news-server.csri.toronto.edu!rpi!zaphod.mps.ohio-state.edu!cis.ohio-state.edu!tut.cis.ohio-state.edu!ucbvax!gnh-starport.cts.com!whitewolf From: whitewolf@gnh-starport.cts.com (Tae Song) Newsgroups: comp.sys.apple2 Subject: Re: I Need a PAL Message-ID: Date: 12 May 91 11:10:53 GMT Sender: daemon@ucbvax.BERKELEY.EDU Organization: The Internet Lines: 31 X-Unparsable-Date: Sat May 11 91 at 05:44:51 (EDT) |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