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Re: apple serial card
- Subject: Re: apple serial card
- From: pausch@saaf.se (Paul Schlyter)
- Date: 13 Mar 2001 01:14:41 +0100
- Newsgroups: comp.sys.apple2
- Organization: Svensk Amat|rAstronomisk F|rening (SAAF)
- References: <98i8ka$21pqq$1@ID-72603.news.dfncis.de> <WK6r6.20699$Ac5.5034133@e3500-chi1.usenetserver.com>
- Xref: supernews.google.com comp.sys.apple2:6601
In article <WK6r6.20699$Ac5.5034133@e3500-chi1.usenetserver.com>,
Matthew Russotto <russotto@wanda.pond.com> wrote:
> Info on the 6850 chip is probably available. The next trick would be
> to figure out where the registers are mapped; probably disassembling
> the slot ROM would help there, if you can't find the information.
You could also get the freeware utility ADT (Pau Guertin's original
SSC version, not my CC verison) and then examine the assembler source
file for the Apple II part of ADT. The "Send character" and "Receive
character" routines are in their own subroutines, and comments in the
source code will help you locate them. In this way you'll quickly
find out where the registers are mapped - naturally they're mapped within
that 16-byte address area assigned to each slot in the Apple II.
--
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Paul Schlyter, Swedish Amateur Astronomer's Society (SAAF)
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