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Debugger fixes for 80386 instructions, plus more Compaq DeskPro 386 notes

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This commit is contained in:
Jeff Parsons 2015-04-09 15:51:17 -07:00 • committed by jeffpar
commit cbeeacd6fd
7 changed files with 374 additions and 105 deletions
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36
modules/pcjs/lib/ram.js
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@ -293,16 +293,44 @@ CompaqController.MAPPINGS = {
/*
* Bit definitions for the 8-bit read-only settings/diagnostics register (bSettings)
*
* SW1-7 and SW1-8 are mapped to bits 5 and 4 of bSettings, respectively, as follows:
*
* SW1-7 SW1-8 Bit5 Bit4 Amount (of base memory provided by the Compaq 32-bit memory board)
* ----- ----- ---- ---- ------
* ON ON 0 0 640Kb
* ON OFF 0 1 Invalid
* OFF ON 1 0 512Kb
* OFF OFF 1 1 256Kb
*
* Other SW1 switches include:
*
* SW1-1: ON enables fail-safe timer
* SW1-2: ON indicates 80387 coprocessor installed
* SW1-3: ON sets the memory from 0xC00000 to 0xFFFFFF (between 12 megabytes and 16 megabytes) non-cacheable
* SW1-4: ON select AUTO system speed (OFF selects HIGH system speed)
* SW1-5: RESERVED (however, the system can read its state; see below)
* SW1-6: Compaq Dual-Mode Monitor or Color Monitor (OFF selects Monochrome monitor other than Compaq)
*
* While SW1-7 and SW1-8 are connected to this memory-mapped register, other SW1 DIP switches are accessible through
* the 8042 Keyboard Controller KBC.INPORT register, as follows:
*
* SW1-1: TODO: Determine
* SW1-2: ChipSet.KBC.INPORT.COMPAQ_NO80387 clear if ON, set (0x04) if OFF
* SW1-3: TODO: Determine
* SW1-4: ChipSet.KBC.INPORT.COMPAQ_HISPEED clear if ON, set (0x10) if OFF
* SW1-5: ChipSet.KBC.INPORT.COMPAQ_DIP5OFF clear if ON, set (0x20) if OFF
* SW1-6: ChipSet.KBC.INPORT.COMPAQ_NONDUAL clear if ON, set (0x40) if OFF
*/
CompaqController.SETTINGS = {
B0_PARITY: 0x01,
B1_PARITY: 0x02,
B2_PARITY: 0x04,
B3_PARITY: 0x08,
BASE_640KB: 0x00,
BASE_ERROR: 0x10,
BASE_512KB: 0x20,
BASE_256KB: 0x30,
BASE_640KB: 0x00, // SW1-7,8: ON ON Bits 5,4: 00
BASE_ERROR: 0x10, // SW1-7,8: ON OFF Bits 5,4: 01
BASE_512KB: 0x20, // SW1-7,8: OFF ON Bits 5,4: 10
BASE_256KB: 0x30, // SW1-7,8: OFF OFF Bits 5,4: 11
ADDED_1MB: 0x40,
PIGGYBACK: 0x80
};