From 2d04cacc5322951f187bb17e017c12920ac8ebe2 Mon Sep 17 00:00:00 2001
From: Mark Zbikowski
Date: Thu, 25 Apr 2024 21:24:10 +0100
Subject: MZ is back!

---
 v4.0/src/BIOS/BIOSTRUC.INC | 103 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 103 insertions(+)
 create mode 100644 v4.0/src/BIOS/BIOSTRUC.INC

(limited to 'v4.0/src/BIOS/BIOSTRUC.INC')

diff --git a/v4.0/src/BIOS/BIOSTRUC.INC b/v4.0/src/BIOS/BIOSTRUC.INC
new file mode 100644
index 0000000..f131e11
--- /dev/null
+++ b/v4.0/src/BIOS/BIOSTRUC.INC
@@ -0,0 +1,103 @@
+%OUT BIOSTRUC.INC...
+;	SCCSID = @(#)BIOSTRUC.INC 1.0 86/09/30
+; ROM BIOS CALL PACKET STRUCTURES
+
+;*******************************
+;System Service call ( Int 15h )
+;*******************************
+;Function AH = 0C0h, Return system configuration
+;For PC and PCJR on return:
+;	(AH)	= 80h
+;	(CY)	= 1
+;For PCXT, PC PORTABLE and PCAT on return:
+;	(AH)	= 86h
+;	(CY)	= 1
+;For all others:
+;	(AH)	= 0
+;	(CY)	= 0
+;	(ES:BX) = pointer to system descriptor vector in ROS
+; System descriptor :
+;	DW	xxxx		length of descriptor in bytes,
+;				minimum length = 8
+;	DB	xx		model byte
+;				0FFh	= PC
+;				0FEh	= PC/XT, Portable
+;				0FDh	= PC/JR
+;				0FCh	= PC/AT, 6Mhz PC/AT,
+;					  6Mhz PC/AT running coprocessor(?),
+;					  PS/2 Model 50, 50 z
+;				0FAh	= PS/2 Model 25, 30
+;				0F9h	= PC Convertible
+;				0F8h	= PS/2 Model 80
+;				0F7h	= Nova
+;				0E0 thru 0EFh = reserved
+;
+;	DB	xx		secondary model byte
+;				000h	= PC1
+;				000h	= PC/XT, Portable
+;				000h	= PC/JR
+;				000h	= PC/AT
+;				001h	= 6Mhz PC/AT
+;				003h	= 6Mhz PC/AT running coprocessor(?)
+;				004h	= PS/2 Model 50, 50z
+;				001h	= PS/2 Model 25
+;				000h	= PC Convertible
+;				000h	= PS/2 Model 80
+;				000h	= Nova
+;
+;	DB	xx		bios revision level
+;				00 for first release, subsequent release
+;				of code with same model byte and
+;				secondary model byte require revison level
+;				to increase by one.
+;
+;	DB	xx		feature information byte 1
+;				X0000000 = 1, bios use DMA channel 3
+;					 = 0, DMA channel 3 not used
+;
+;				0X000000 = 1, 2nd Interrupt chip present
+;					 = 0, 2nd Interrupt chip not present
+;
+;				00X00000 = 1, Real Time Clock present
+;					 = 0, Real Time Clock not present
+;
+;				000X0000 = 1, Keyboard escape sequence(INT15h)
+;						called in keyboard interrupt
+;						(Int 09h).
+;					 = 0, Keyboard escape sequence not
+;						called.
+;				0000XXXX reserved
+;
+;	DB	xx		feature information byte 2 - reserved
+;
+;	DB	xx		feature information byte 2 - reserved
+;
+;	DB	xx		feature information byte 2 - reserved
+;
+;	DB	xx		feature information byte 2 - reserved
+;
+
+BIOS_SYSTEM_DESCRIPTOR	struc
+bios_SD_leng		dw	?
+bios_SD_modelbyte	db	?
+bios_SD_scnd_modelbyte	db	?
+			db	?
+bios_SD_featurebyte1	db	?
+			db   4 dup (?)
+BIOS_SYSTEM_DESCRIPTOR ends
+
+;FeatureByte1	bit map equates
+DMAchannel3		equ 10000000b
+ScndIntController	equ 01000000b
+RealTimeClock		equ 00100000b
+KeyEscapeSeq		equ 00010000b
+;
+;Model Byte
+MDL_PC1 	EQU	0FFH
+MDL_XT		EQU	0FEH
+MDL_JR		EQU	0FDH
+MDL_AT		EQU	0FCH
+MDL_CONVERT	EQU	0F9H
+
+mdl_ps2_30	equ	0fah
+mdl_ps2_80	equ	0f8h
-- 
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