ftoobig         equ     80h
fbig            equ     40h
romstatus       equ     1
romread         equ     2
romwrite        equ     3
romverify       equ     4
romformat       equ     5


rsinit  =       0a3h    ;rs232 initialization
                        ;9600 baud:no parity:1 stop:8 bit word

lf      =       10      ;line feed
cr      =       13      ;carriage return
backsp  =       8       ;backspace
brkadr  =       1bh * 4 ;006c   1bh break vector address
timadr  =       1ch * 4 ;0070   1ch timer interrupt
dskadr  =       1eh * 4 ;address of ptr to disk parameters
sec9    =       522h    ;address of disk parameters
headsettle=     sec9+9  ;address of head settle time
normsettle=     15      ;normal head settle
speedsettle=    0       ;speed up settle time
initspot=       534h    ;ibm wants 4 zeros here
akport  =       20h
eoi     =       20h

cmdlen  =       0       ;length of this command
unit    =       1       ;sub unit specifier
cmd     =       2       ;command code
status  =       3       ;status
media   =       13      ;media descriptor
trans   =       14      ;transfer address
count   =       18      ;count of blocks or characters
start   =       20      ;first block to transfer
extra   =       22      ;usually a pointer to vol id for error 15
start_l =       26      ; extended start sector (low)
start_h =       28      ; extended start sector (high)


chrout  =       29h
maxerr  =       5
lstdrv  =       504h

bootbias        =       200h
notbusystatus   =       10000000b       ; not busy
ackstatus       =       01000000b       ; acknowledge (for what?)
nopaperstatus   =       00100000b       ; no more paper
.selectedstatus =       00010000b       ; the printer said it was selected
ioerrstatus     =       00001000b       ; some kinda error
reserved        =       00000110b       ; nops
timeoutstatus   =       00000001b       ; time out.
error_unknown_media = 7                 ; for use in build bpb call

DOS_FLAG_OFFSET equ     86h             ; offset of DOS_FLAG var in dos data seg