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Jasmine Iwanek
2022-11-13 16:37:58 -05:00
parent 702371a369
commit bd75bc141a
251 changed files with 2767 additions and 2703 deletions
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src/device/bugger.c
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@@ -1,53 +1,53 @@
/*
* 86Box A hypervisor and IBM PC system emulator that specializes in
* running old operating systems and software designed for IBM
* PC systems and compatibles from 1981 through fairly recent
* system designs based on the PCI bus.
* 86Box A hypervisor and IBM PC system emulator that specializes in
* running old operating systems and software designed for IBM
* PC systems and compatibles from 1981 through fairly recent
* system designs based on the PCI bus.
*
* This file is part of the 86Box distribution.
* This file is part of the 86Box distribution.
*
* Implementation of the ISA Bus (de)Bugger expansion card
* sold as a DIY kit in the late 1980's in The Netherlands.
* This card was a assemble-yourself 8bit ISA addon card for
* PC and AT systems that had several tools to aid in low-
* level debugging (mostly for faulty BIOSes, bootloaders
* and system kernels...)
* Implementation of the ISA Bus (de)Bugger expansion card
* sold as a DIY kit in the late 1980's in The Netherlands.
* This card was a assemble-yourself 8bit ISA addon card for
* PC and AT systems that had several tools to aid in low-
* level debugging (mostly for faulty BIOSes, bootloaders
* and system kernels...)
*
* The standard version had a total of 16 LEDs (8 RED, plus
* 8 GREEN), two 7-segment displays and one 8-position DIP
* switch block on board for use as debugging tools.
* The standard version had a total of 16 LEDs (8 RED, plus
* 8 GREEN), two 7-segment displays and one 8-position DIP
* switch block on board for use as debugging tools.
*
* The "Plus" version, added an extra 2 7-segment displays,
* as well as a very simple RS-232 serial interface that
* could be used as a mini-console terminal.
* The "Plus" version, added an extra 2 7-segment displays,
* as well as a very simple RS-232 serial interface that
* could be used as a mini-console terminal.
*
* Two I/O ports were used; one for control, at offset 0 in
* I/O space, and one for data, at offset 1 in I/O space.
* Both registers could be read from and written to. Although
* the author has a vague memory of a DIP switch to set the
* board's I/O address, comments in old software seems to
* indicate that it was actually fixed to 0x7A (and 0x7B.)
* Two I/O ports were used; one for control, at offset 0 in
* I/O space, and one for data, at offset 1 in I/O space.
* Both registers could be read from and written to. Although
* the author has a vague memory of a DIP switch to set the
* board's I/O address, comments in old software seems to
* indicate that it was actually fixed to 0x7A (and 0x7B.)
*
* A READ on the data register always returned the actual
* state of the DIP switch. Writing data to the LEDs was done
* in two steps.. first, the block number (RED or GREEN) was
* written to the CTRL register, and then the actual LED data
* was written to the DATA register. Likewise, data for the
* 7-segment displays was written.
* A READ on the data register always returned the actual
* state of the DIP switch. Writing data to the LEDs was done
* in two steps.. first, the block number (RED or GREEN) was
* written to the CTRL register, and then the actual LED data
* was written to the DATA register. Likewise, data for the
* 7-segment displays was written.
*
* The serial port was a bit different, and its operation is
* not verified, but two extra bits in the control register
* were used to set up parameters, and also the actual data
* input and output.
* The serial port was a bit different, and its operation is
* not verified, but two extra bits in the control register
* were used to set up parameters, and also the actual data
* input and output.
*
* TODO: Still have to implement the RS232 Serial Port Parameters
* configuration register (CTRL_SPCFG bit set) but have to
* remember that stuff first...
* TODO: Still have to implement the RS232 Serial Port Parameters
* configuration register (CTRL_SPCFG bit set) but have to
* remember that stuff first...
*
*
*
* Author: Fred N. van Kempen, <decwiz@yahoo.com>
* Copyright 1989-2018 Fred N. van Kempen.
* Authors: Fred N. van Kempen, <decwiz@yahoo.com>
* Copyright 1989-2018 Fred N. van Kempen.
*/
#include <stdarg.h>
#include <stdio.h>