home
***
CD-ROM
|
disk
|
FTP
|
other
***
search
/
ftp.barnyard.co.uk
/
2015.02.ftp.barnyard.co.uk.tar
/
ftp.barnyard.co.uk
/
cpm
/
walnut-creek-CDROM
/
ENTERPRS
/
CPM
/
UTILS
/
A
/
BIOSR4.ARC
/
CXEXT.ASM
< prev
next >
Wrap
Assembly Source File
|
1987-04-26
|
3KB
|
152 lines
; ?int65 now sets 6551 baud rate based on baudrate byte set in devtbl.
;
; user assumes all liability for the use of this module
;
; original copyright maintained by Commodore
title 'C128 external Disk drive support 26 April 87'
maclib cpm3
maclib z80
maclib cxequ
extrn X6551$baud
public ?int65,?in65,?ins65,?out65
; Utility routines in standard BIOS
extrn ?pmsg ; print message @<HL> up to 00
; saves <BC> & <DE>
extrn ?pdec ; print binary number in <A> from 0 to 99.
extrn ?pderr ; print BIOS disk error header
extrn ?conin,?cono ; con in and out
extrn ?const ; get console status
;
; drive table
;
public @dtbl
extrn cmdsk0,cmdsk1,cmdsk2,RMdsk
page
;
; DRVTBL.ASM
;
CSEG ; place code in common memory
;**************************************
; drive table alterd to change ramdisk to drive D, and
; delete drive E
;****************************************
@dtbl:
dw cmdsk0 ;* drive A 1541/1571
dw cmdsk1 ;* drive B 1541/1571
dw cmdsk2 ;* drive C 1541/1571
dw RMdsk ;* drive D Ram Drive
dw 0 ;* drive E
dw 0 ;* drive F
dw 0 ;* drive G
dw 0 ;* drive H
dw 0 ;* drive I
dw 0 ;* drive J
dw 0 ;* drive K
dw 0 ;* drive L
dw 0 ;* drive M
dw 0 ;* drive N
dw 0 ;* drive O
dw 0 ;* drive P
page
;==========================================================
; CHARACTER INITIALIZATION ROUTINES
;==========================================================
;
;
;
dseg
;
; set com rate to 9600 baud
;
?int65:
init$ext:
lxi b,command$6551 ; (02)
mvi a,cmd$init
outp a
inx b
mvi a,10h ; baud rate equ 9600
lxi h,X6551$baud
add m
outp a
dcx b ; (02)
dcx b ; (01)
inp a
dcx b ; (00)
inp a
ret
page
;==========================================================
; CHARACTER INPUT ROUTINES
;==========================================================
;
;
;
dseg
?in65: ; character input
call ?ins65
jrz ?in65
lxi b,rxd$6551
inp a
ret
;==========================================================
; CHARACTER DEVICE INPUT STATUS
;==========================================================
;
;
;
dseg
?ins65: ; character input status
lxi b,status$6551
inp a
ani rxrdy
rz
ori -1
ret
;==========================================================
; CHARACTER DEVICE OUTPUT
;==========================================================
;
; the character to be output is in the C register
;
dseg
?out65: ; character output
mov a,c
push psw
lxi b,status$6551
send$wait:
inp a
ani txrdy
jrz send$wait
pop psw
lxi b,txd$6551
outp a
ret
end
ush psw
lxi b,status$6551
send$wait:
inp a
ani txrdy
jrz send$wait
pop ps