Path: utzoo!utgpu!watmath!isishq!f171.n221.z1.FIDONET.ORG!izot
From: izot@f171.n221.z1.FIDONET.ORG (Geoffrey Welsh)
Newsgroups: comp.sys.cbm
Subject: Another info request for old CBM computers
Message-ID: <1284.23DA03B2@isishq.FIDONET.ORG>
Date: 21 Jan 89 18:13:36 GMT
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 > From: demoedf@iitmax.IIT.EDU (ed federmeyer)
 > Message-ID: <2035@iitmax.IIT.EDU>
 >
 > I have a CBM 8096 computer and I need to know the following...
 > 1) How is the expanded 64K option used?  I have the board installed and it
 >    still shows up as 38K (I think) free BASIC memory.
 
   Like the C64, the extra RAM is banked under the ROMs, I/O, etc... although 
I never played with an 8096 or 8296, I believe the 64K is split into four 16K 
banks that can replace one (or perhaps both) of the 16K segments starting at 
$8000 or $C000.
 
 > 2) How do I drive the onboard film speaker, besides printing CTRL-G?
 
   The input to the speaker is amplified from the VIA's CB2 output. You can 
toggle that manually or set the shift register to shift out onto that line, 
using timer 2 in free-running mode to set the shift time.
 
 > 3) Is there an IEEE to RS232 interface available?  I would like to run a
 >    BBS message system with it, and I would like to hook up a cheap hayes
 >    compatible 300 baud RS-232 modem.
 
   I'm sure there are IEEE-488 to RS-232C interfaces, but the "standard" 
method of attaching an RS-232 modem to the PET is via the user port. Voltage 
conversion (if necessary - it may not be) must be handled by a device similar 
to the VIC-1011A for the C64/128, and internal software drives the user port 
lines as if they were RS-232 lines.
 
   For more specific info on any of the above topics, send me some mail.
 
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