CP/M 2 BIOS, BOOT, and Utilities for Tarbell MDL 1011D and Altair 88-2SIO
www.virtualaltair.com March 23, 2009

ASM Code by:

; ================
; MICHAEL J. KARAS
; MICRO RESOURCES
; These days Mike can be reached at mkaras@carousel-design.com” (March 23, 2009)
; ==============

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BIOS248 48K CP/M
BIOS256 56K CP/M
BIOS260 60K CP/M

; THIS MODULE CONTAINS ALL THE INPUT/OUTPUT
; ROUTINES FOR THE CP/M SYSTEM, INCLUDING
; THE DISK ROUTINES.


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BOOT248 48K CP/M
BOOT256 56K CP/M
BOOT260 60K CP/M

; TRACK ZERO SECTOR 1 COLD BOOT LOADER PROGRAM. THIS PROGRAM IS
; PLACED INTO RAM AT ADDRESS 0000H BY THE INITIAL MONITOR CP/M
	 

; THIS PROGRAM IS LOADED AT LOCATION ZERO
; BY THE BOOTSTRAP PROGRAM, AND EXECUTED.
; ITS PURPOSE IS TO LOAD AND EXECUTE THE
; CP/M DISK OPERATING SYSTEM AT THE TOP
; OF THE MEMORY IN USE.


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COPY

;**********************************************************************
;	SINGLE DENSITY DISK COPY PROGRAM FOR TARBELL DD CONTROLLER
;**********************************************************************
;
;	THIS PROGRAM IS USED TO COPY SINGLE DENSITY DISKS FROM
;	DRIVE A: TO DRIVE B:. THE BIOS PRIMITIVES ARE ACCESSED
;	DIRECTLY FOR SPEED. COMMANDS ACCEPTED BY THIS PROGRAM
;	AND THE TRACKS CORRESPONDINGLY  COPIED ARE AS FOLLOWS:
;
;		COPY ALL		TRACKS 00 TO 76
;		COPY SYSTEM		TRACKS 00 TO 01
;		COPY DATA		TRACKS 02 TO 76

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FORMAT 

;**********************************************************************
;	SINGLE DENSITY DISKETTE FORMATTER FOR TARBELL DD CONTROLLER
;**********************************************************************
;
;	THIS PROGRAM FORMATS SINGLE DENSITY DISKETTES IN DRIVE B:
;	WITH THE DOUBLE DENSITY TARBELL DISKETTE CONTROLLER.
;	IBM STANDARD FORMAT IS UTILIZED THROUGH OUT THE FORMAT
;	PROCESS. FORMATTING IS FOR 26 SECTORS OF 128 BYTES OF
;	0E5H DATA ON EACH OF THE 77 TRACKS.


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MOVBOOT - Prom boot

;	THIS PROGRAM IS DESIGNED TO BOOT SECTOR 1 OF TRACK 0
;	ON A TARBELL DISK USING THE TARBELL SINGLE DENSITY
;	DISK CONTROLLER BOARD. TRACK 0 IS FORMATTED SINGLE
;	DENSITY SO THE CPU CAN DO THE DATA TRANSFER. THE BOOT
;	ROUTINE LOADS A PROGRAM FROM DISK INTO MEMORY AND THEN
;	JUMPS TO THAT ROUTINE. THE PROGRAM LOADED STARTS AT
;	MEMORY ADDRESS 0000H.
;		THE PART OF THIS PROGRAM THAT ACTUALLY DOES THE
;	THE BOOT OPERATION IS MOVED FROM A DATA AREA IN THE 1702A
;	TURNKEY PROMS AT ADDRESS 0FE00H TO BE EXECUTED FROM WITHIN
;	CPU RAM AT ADDRESS 01000H. THIS IS NECESSARY DUE TO THE
;	EXTENDED WAITSTATE TIME AFFORDED BY THE TURNKEY MODULE
;	WHICH COULD RESULT IN DATA LOST ERRORS AT THE DISK CONTROLLER
;	BOARD. THE FIRST PROM ONLY CONTAINS A BLOCK MOVE ROUTINE
;	TO TRANSFER THE DATA TO THE EXECUTION AREA AT 01000H.

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Tom Sanderson
www.virtualaltair.com