From: Ryan Underwood <nemesis-lists@icequake.net>
To: linux-msdos@vger.kernel.org
Subject: vgaemu reserving 0x3b0-0x3bf incorrectly
Date: Sat, 12 Jun 2004 07:25:03 -0500 [thread overview]
Message-ID: <20040612122503.GA9959@dbz.icequake.net> (raw)
[-- Attachment #1.1: Type: text/plain, Size: 584 bytes --]
Hi,
I noticed that I was unable to use a direct-access parallel port program
with dosemu -X because the port range was reserved for Hercules
emulation. Looking into some Hercules programming docs, it looks like
only 0x3b0-0x3bb and 0x3bf are necessary for the graphics chip, leaving
0x3bc-0x3be (the 3 parallel port registers) open for the parallel port
which used to also come on a Hercules graphics card. Also, linux hgcfb
follows the same approach. The attached patch fixed that and let my
program run under dosemu -X
--
Ryan Underwood, <nemesis@icequake.net>
[-- Attachment #1.2: dosemu-hercules-ports.diff --]
[-- Type: text/plain, Size: 648 bytes --]
--- src/env/video/vgaemu.bak 2004-06-12 04:29:27.000000000 -0500
+++ src/env/video/vgaemu.c 2004-06-12 07:03:54.000000000 -0500
@@ -1458,8 +1458,13 @@
* if something is missing. -- sw
*/
if(vga.config.mono_support) {
- io_device.handler_name = "VGAEmu Mono/Hercules Card";
+ io_device.handler_name = "VGAEmu Mono/Hercules Card Range 0";
io_device.start_addr = 0x3b0;
+ io_device.end_addr = 0x3bb;
+ port_register_handler(io_device, 0);
+
+ io_device.handler_name = "VGAEmu Mono/Hercules Card Range 1";
+ io_device.start_addr = 0x3bf;
io_device.end_addr = 0x3bf;
port_register_handler(io_device, 0);
}
[-- Attachment #2: Digital signature --]
[-- Type: application/pgp-signature, Size: 189 bytes --]
reply other threads:[~2004-06-12 12:25 UTC|newest]
Thread overview: [no followups] expand[flat|nested] mbox.gz Atom feed
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20040612122503.GA9959@dbz.icequake.net \
--to=nemesis-lists@icequake.net \
--cc=linux-msdos@vger.kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox