**************************
* HEADER FILE FOR XMODEM *
**************************
*=====================================*
* ASSEMBLY OPTION: TXTMODEM OR XMODEM
*  EXACTLY ONE OF THESE MUST BE TRUE
*=====================================*
TXTMO EQU FALSE  ;TRUE TO CREATE TXTMODEM
XMODM EQU TRUE ;TRUE TO CREATE XMODEM

*==================*
* ASSEMBLY OPTIONS
*==================*
 IF TXTMO
PACFY EQU TRUE  ;PRINT PROGRESS PACIFIERS
 ENDF

 IF XMODM
PACFY EQU FALSE  ;DON'T PRINT PROGRESS PACIFIERS
 ENDF

*===============*
* SOLOS EQUATES
*===============*
SOLOS EQU 0C000H  ;SOLOS BASE ADDRESS
AOUT EQU 1CH  ;WRITE CHR IN B TO PSEUDOPORT IN A
AINP EQU 22H  ;READ FROM PSEUDOPORT A INTO A
* PSEUDOPORTS
KBDPP EQU 0  ;KEYBOARD
VDMPP EQU 0  ;VDM
SERPP EQU 1  ;SERIAL
PARPP EQU 2  ;PARALLEL
USRPP EQU 3  ;USER-WRITTEN

*===============*
* PTDOS EQUATES
*===============*
CONST EQU 0BC9CH  ;TEST CONSOLE FOR WAITING CHR
CONIN EQU 0BCA2H ;GET CONSOLE CHR INTO A
CONOT EQU 0BC9FH  ;SEND A TO CONSOLE

SYS EQU 0BCBCH  ;SYSTEM CALL
RESET EQU 20  ;RESET SYSTEM COMMAND

*===============*
* ASCII EQUATES
*===============*
SOH EQU 1  ;Start of XMODEM block
EOT EQU 4  ;End XMODEM session
ACK EQU 6  ;XMODEM block acknowledge
NAK EQU 15H  ;XMODEM block negative ACK
CR EQU 0DH  ;CARRIAGE RETURN
LF EQU 0AH  ;LINE FEED
ESC EQU 1BH  ;ESCAPE

*=================*
* PROGRAM EQUATES
*=================*
MSEOF EQU 1AH  ;MS-DOS EOF CHR
ERLIM EQU 10  ;MAX ERRORS BEFORE GIVING UP
BLKSZ EQU 128  ;BYTES/XMODEM BLOCK (128!)
CRTRY EQU 3  ;TIMES TO TRY CRC BEFORE REVERTING TO CKSUM

 IF TXTMO
PADCH EQU MSEOF  ;TEXT FILES GET PADDED WITH MSDOS EOF
 ENDF

 IF XMODM
PADCH EQU 0  ;PAD BINARY WITH NULLS
 ENDF

* Timeout values in seconds
SOHTO EQU 10  ;sender to send SOH 
NAKTO EQU 90  ;receiver to send initial NAK
ACKTO EQU 60  ;receiver to ACK (or NAK)

 IF PACFY
* Progress pacifiers printed on the console
PACACK EQU '+'  ;Received an ACK
PACNAK EQU '-'  ;Received a NAK
PACBLK EQU '+'  ;Received a good block
PACRSD EQU '-'  ;Requested a resend
 ENDF

*===================*
* MEMORY ALLOCATION
*===================*

*--------------------------------------------------*
* BLKBF (THE BLOCK TRANSFER BUFFER) MUST BE ON 100H
* BOUNDARY AND MUST BE A MULTIPLE OF 100H IN SIZE.
* tHE DRIVER CODE FOLLOWS IMMEDIATELY AFTER BLKBF.
*--------------------------------------------------*

 ORG 0D000H   ;BASE ADDRESS MUST END WITH 00

BLKBF: DS 800H  ;BUFFER SIZE MUST END WITH 00
BBMAX EQU $
MAIN EQU $  ;MAIN MEMORY SEGMENT ADDRESS