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.LIST on
; ACIA page 0 local var's 
SERDP:  .SECTION page0, ref_only, offset aciap0
SERDP_START     .EQU    $

; acia 1 var's
aisr            .DB             ; interrupt status register
acsr            .DB             ; control status register
afr             .DB             ; format register
aout            .DB             ; XON/XOFF sending flag

; acia 2 var's
                .DS     4

;----------------------------------------------------------------------------

; acia 1 flag's
ahsk            .DB             ; handshake flag
                                ; <7>: handshake on
                                ; <6>: hardware handshake (RTS,CTS)

apause          .DB             ; local/remote pause flag               
                                ; <7>: remote pause (XOFF/RTS=1)
                                ; <6>: local pause (XON/CTS=1)

arxe            .DB             ; rx data error flag            
                                ; <7>: rx error (data discarded)
                                ; <6>: rx buffer overflow
                                ; <5>: remote disconnession
                                ; <2>: framing error
                                ; <1>: parity error
                                ; <0>: overrun error

arem            .DB             ; format register or'ing for remote pause

; acia 2 flag's
                .DS     4

;----------------------------------------------------------------------------

; acia 1 control line
adsrt           .DB             ; DSR,DCD,CTS transition status
                                ; <7>: DSRT, <6>: CTST, <5>: DCDT

adsrl           .DB             ; DSR,DCD,CTS level status
                                ; <7>: DSRL, <6>: CTSL, <5>: DCDL
                                
amask           .DB             ; and mask for check remote disconnession
                                ; <7>: check DSR line - <5>: check DCD line

aptr            .DB             ; save acia pointer while ISR

; acia 2 control line
                .DS     3
                .DB
        
;----------------------------------------------------------------------------

; buffer pointers
rxptr           .DW             ; pointer to rx buffer
txptr           .DW             ; pointer to tx buffer
rxptr2          .DW
txptr2          .DW

;----------------------------------------------------------------------------

; tail pointers
aicnt           .DW             ; size of input tail queue 
aitail          .DW             ; pointer to input tail queue

SERDP_SIZ       .EQU    ($-FSTMP_START)
        .ENDS
.LIST off