Tech Arsenal 1/Tech Arsenal (Arsenal Computer).ISO/tek-05/drivers1.zip/HPPCLAN.ASM

Assembly Source File | 1992-01-10 | 23KB | 897 lines

PAGE ,132
version    equ    1
;History:74,1

;  Russell Nelson, Clarkson University.
;  Copyright, 1988-1991, Russell Nelson
;  The following people have contributed to this code: David Horne, Eric
;  Henderson, and Bob Clements.

;   This program is free software; you can redistribute it and/or modify
;   it under the terms of the GNU General Public License as published by
;   the Free Software Foundation, version 1.
;
;   This program is distributed in the hope that it will be useful,
;   but WITHOUT ANY WARRANTY; without even the implied warranty of
;   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
;   GNU General Public License for more details.
;
;   You should have received a copy of the GNU General Public License
;   along with this program; if not, write to the Free Software
;   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

; Modified 910516 by Glenn Talbott, Hewlett-Packard Roseville Networks
; Division, to support the HP 27247A assembly number 27247-60002. This
; new version of the HP 27247A has a jumper which allows operation in PCs
; which violate the ISA specification for IOCHRDY by expecting the card
; to assert IOCHRDY early (actually before the card can fully decode the
; IO Address). This change does not affect this driver, however the following
; changes do.
;
; The card ID byte changes from 0x81 to 0x91.
;
; Added support for interrupt IRQ numbers 10 and 11.
;
; Comments in this code refer to 27247 rev 1.

    include    defs.asm

code    segment    word public
    assume    cs:code, ds:code

;*****************************************************************************
;
;    hppclan controller board offsets
;    IO port definition (BASE in io_addr)
;*****************************************************************************
NE_DATAPORT    EQU    0ch        ; hppclan Port Window.
HP_PROM        equ    00h
HP_OPTION    equ    08h
EN_OFF        equ    10h

ENDCFG_BM8    equ    48h

OPTION_RUN    equ    01h
OPTION_DATA    equ    10h

    include    8390.inc

; Shared memory management parameters

SM_TSTART_PG    EQU    0h        ; First page of TX buffer
SM_RSTART_PG    EQU    6h        ; start at page 6
ifndef debugxx
SM_RSTOP_PG    EQU    80h        ; end at page 80
; add larger memory constant for 16 bit cards - gft - 910528
SM_RSTOP_PG16    EQU    0FFh        ; end at page 0xff if 16 bit card
else
; Make problems occur sooner and faster by having a smaller ring
; - gft - 910618
SM_RSTOP_PG    EQU    1fh
SM_RSTOP_PG16    EQU    1fh
endif

ram_enable    macro
    endm

mc_chan_on    macro
    mov    al,chan_sel
    mov    dx,96h
    out    dx,al            ; select channel

    mov    dx,94h
    mov    al,0a0h
    out    dx,al            ; protect system board

    mov    dx,102h            ; point dx at option reg
endm

mc_chan_off    macro
    mov    dx,96h
    xor    al,al
    out    dx,al
endm

reset_8390    macro
    local   is_mc_b
    local    not_mc_c
    local    not_mc_d

    test    sys_features,MICROCHANNEL
    jne    is_mc_b
    jmp    not_mc_c
is_mc_b:
    mc_chan_on
    in    al,dx            ;capture and save option register
    and    al, not OPTION_RUN    ;reset the 8390
    out    dx,al
    longpause
    or    al, OPTION_RUN        ;turn it back on
    out    dx,al
    mc_chan_off
    loadport            ;Set DX the way we expect it
    setport    HP_OPTION
    jmp    not_mc_d

not_mc_c:
    loadport
    setport    HP_OPTION        ;hard reset 8390.
    xor    al,al            ;reset the 8390
    out    dx,al
    longpause

; Revised int_no setting to use table lookup for 27247 rev 1

    push    bx        ;paranoia?
    xor    bh,bh            ;clear high half of bx
    mov    bl,int_no        ;get the index
    add     bx,cs:int_bits        ;add the address of table
                ; the superfluous segment override prevents
                ; one of those #$%^&! phase errors in MASM
    mov    al,byte ptr [bx]    ;properly adjusted bits for int_no
    or    al, OPTION_RUN        ;turn it back on
    out    dx,al
    pop    bx

not_mc_d:
    endm

terminate_board    macro
    local is_mc_a
    local not_mc_a
    local not_mc_b
    test    sys_features,MICROCHANNEL
    jne    is_mc_a
    jmp    not_mc_a

is_mc_a:
; I can't believe this ever worked right, so it's probably not necessary
; to put the card into reset for a terminate. Never the less the
; call to the mc_chan_on macro was missing from here - gft - 910529
;
; New comment: When I wrote the above 910529 comment I couldn't figure out
; how it ever worked, now I know; It never did. In a microchannel machine
; the system boots and the option register is set with the proper IRQ, I/O
; address, and OPTION_RUN on by system initialization code. When we terminate
; the packet driver we leave the OPTION_RUN bit OFF. When the OPTION_RUN bit
; is OFF you can't read the station address from ROM, hence the code which
; identifies the card fails! Therefor you can't ever re-start the packet
; driver after a terminate!
;
; To fix this, and leave the card in the same state as at bootup, I modified
; the below code to reset, then restore the option register for MCA machines.
;
; - gft - 910610
;
    mc_chan_on
    in    al,dx            ;capture and save option register
    and    al, not OPTION_RUN    ;reset the 8390
    out    dx,al
    longpause
    or    al, OPTION_RUN        ;turn the card back on for future access
    out    dx,al
    mc_chan_off
    loadport            ;Set DX the way we expect it
    setport    HP_OPTION
    jmp    not_mc_b

not_mc_a:
    loadport
    setport    HP_OPTION        ;hard reset 8390.
    xor    al,al
    out    dx,al
not_mc_b:
    endm

    extrn    sys_features: byte

    extrn    set_recv_isr: near

;enter with si -> argument string, di -> word to store.
;if there is no number, don't change the number.
    extrn    get_number: near

;enter with dx -> name of word, di -> dword to print.
    extrn    print_number: near

;enter with al = single character
    extrn    chrout: near

    public    int_no, io_addr
int_no        db    3,0,0,0        ;must be four bytes long for get_number.
io_addr        dw    0300h,0        ; I/O address for card (jumpers)

    public    driver_class, driver_type, driver_name, driver_function, parameter_list
driver_class    db    BLUEBOOK, IEEE8023, 0        ;from the packet spec
driver_type    db    ?        ;Wild card matches any type
driver_name    db    "HP ",20 dup(?)    ;name of the driver.
driver_function    db    2
parameter_list    label    byte
    db    1    ;major rev of packet driver
    db    9    ;minor rev of packet driver
    db    14    ;length of parameter list
    db    EADDR_LEN    ;length of MAC-layer address
    dw    GIANT    ;MTU, including MAC headers
    dw    MAX_MULTICAST * EADDR_LEN    ;buffer size of multicast addrs
    dw    0    ;(# of back-to-back MTU rcvs) - 1
    dw    0    ;(# of successive xmits) - 1
int_num    dw    0    ;Interrupt # to hook for post-EOI
            ;processing, 0 == none,

is_186        db    0

chan_sel    db    0    ;Channel select for MICROCHANNEL machines

;
;    Special case Block input routine. Used on extra memory
;    space for board ID etc. DMA count is set X2,
;    CX = byte count, es:si = buffer location, ax = buffer address
;
sp_block_input:
;    Nothing special needed for hppclan
;
;    Block input routine
;    CX = byte count, es:si = buffer location, ax = buffer address

    public    block_input
block_input:
    push    ax            ; save buffer address

    loadport
    setport    HP_OPTION
    test    sys_features,MICROCHANNEL
    je    not_mc_1
    jmp    is_mc_1
not_mc_1:
    in    al,dx
    or    al,OPTION_DATA        ;Enable the data port except on MCA
    out    dx,al

is_mc_1:
    setport EN_CCMD
    pause_
    mov    al,ENC_NODMA+ENC_PAGE0+ENC_START
    out    dx,al
    setport    EN0_RCNTLO    ; remote byte count 0
    pause_
    mov    al,cl
    out    dx,al
    setport    EN0_RCNTHI
    pause_
    mov    al,ch
    out    dx,al
    pop    ax        ; get our page back
    setport    EN0_RSARLO
    pause_
    out    dx,al        ; set as hi address
    setport    EN0_RSARHI
    pause_
    mov    al,ah
    out    dx,al
    setport EN_CCMD
    pause_
    mov    al,ENC_RREAD+ENC_START    ; read and start
    out    dx,al
    setport    NE_DATAPORT
    pause_
    cmp    is_186,0
    jnz    read_186
    shr    cx,1
read_loop:
    in    ax,dx        ; get a word
    stosw            ; save it
    loop    read_loop
    jnc    read_done
    in    al,dx
    stosb
    jmp    short read_done
read_186:
    shr    cx,1
    db    0f3h, 06dh    ;masm 4.0 doesn't grok "rep insw"
    jnc    read_done
    db    06ch        ;masm 4.0 doesn't grok "insb"
read_done:
    setport    HP_OPTION
    test    sys_features,MICROCHANNEL
    je    not_mc_2
    ret
not_mc_2:
    in    al,dx
    and    al,not OPTION_DATA
    out    dx,al
    ret
;
;    Block output routine
;    CX = byte count, ds:si = buffer location, ax = buffer address


block_output:
    assume    ds:nothing
    push    ax        ; save buffer address

    loadport
    setport    HP_OPTION
    test    sys_features,MICROCHANNEL
    je    not_mc_3
    jmp    is_mc_3
not_mc_3:
    in    al,dx
    or    al,OPTION_DATA    ; enable the data port except on MCA
    out    dx,al

is_mc_3:
    inc    cx        ; make even
    and    cx,0fffeh
    setport EN_CCMD
    pause_
    mov    al,ENC_NODMA+ENC_START
    out    dx,al        ; stop & clear the chip

; To quote from the National DP8390 Datasheet Addendum, June 1990
;
;   11.0 Remote DMA Write
;
;   Under certain conditions the NIC may issue /MWR and /PRD before
;   PRQ for the first DMA transfer. This causes an extraneous byte to be
;   written inot memory at the first Remote DMA Write location. [...]
;
;   To prevent this condition, write a non-zero value into RBCR0 and
;   issued [sic] the Remote Read DMA command to the NIC (CR=0AH), but
;   do not give any Read Acknowledges (/RACK). (This causes PRQ to go high.)
;   Then write the desired byte count into RBCR0 and RBCR1 and give the
;   Remote Write DMA command (CR=12H). The Remote Write DMA will operate as
;   normal.
;
; My interpretation of the above is          - gft - 910603


    setport    EN0_RCNTLO    ; remote byte count 0
    pause_
    mov    al,0ffh        ; a non-zero value
    out    dx,al
    setport EN_CCMD
    pause_
    mov     al,ENC_RREAD+ENC_START ; read and start
    out     dx,al        ; starts the read setting PRQ for the first
                ; DMA transfer, now reprogram everything
                ; and start a write instead.

;
; BUT WHAT THE NATIONAL DOCUMENTATION DOESN'T TELL YOU ...
;
;  When the read is started, the remote byte count register is decremented
;  (in this case from 0ffh to 0feh). This takes a finite amount of time.
;  IF you are TOO QUICK in re-programming the remote byte count 0 register
;  to the correct value, the NEW VALUE GETS DECREMENTED INSTEAD! Then when
;  you reach the last byte of the buffer and you output it to the IO port,
;  the NIC has already reached a count of zero and WON'T HANDSHAKE THE LAST
;  BYTE!. Result, computer HUNG, powercycle to recover. Therefore a stall is
;  required here, I use at least 1.5uS
;                                      - gft - 910603
;
    in    al,61h        ; read from NMI Status register for IO delay
    in    al,61h        ; ~ 0.5uS on Microchannel and ~ 1.0 on ISA
    in    al,61h        ; for a total of ~1.5uS or 3.0uS.

; we now return you to your regularly scheduled block_output routine.

    setport    EN0_RCNTLO    ; remote byte count 0
    pause_
    mov    al,cl
    out    dx,al
    setport    EN0_RCNTHI
    pause_
    mov    al,ch
    out    dx,al
    pop    ax        ; get our page back
    setport    EN0_RSARLO
    pause_
    out    dx,al        ; set as lo address
    setport    EN0_RSARHI
    pause_
    mov    al,ah
    out    dx,al
    setport EN_CCMD
    pause_
    mov    al,ENC_RWRITE+ENC_START    ; write and start
    out    dx,al
    setport    NE_DATAPORT
    pause_
    shr    cx,1
    cmp    is_186,0
    jnz    write_186
write_loop:
    lodsw            ; get a word
    out    dx,ax        ; save it
    loop    write_loop
    jmp    short write_done
write_186:
    db    0f3h, 06fh        ;masm 4.0 doesn't grok "rep outsw"
write_done:
    mov    cx,0
    setport    EN0_ISR
tx_check_rdc:
    in    al,dx
    test    al,ENISR_RDC    ; dma done ???
    clc
    jnz    tx_start
    loop    tx_check_rdc
    stc
tx_start:
    setport    HP_OPTION
    test    sys_features,MICROCHANNEL
    je    not_mc_4
    ret
not_mc_4:
    lahf                ;save cy.
    in    al,dx
    and    al,not OPTION_DATA
    out    dx,al
    sahf                ;restore cy.
    ret

    include    8390.asm

    public    usage_msg
usage_msg    db    "usage: hppclan [-n] [-d] [-w] <packet_int_no> [<int_no> [<io_addr>]]",CR,LF

    public    copyright_msg
copyright_msg    db    "Packet driver for HP PC LAN cards, version "
        db    '0'+majver,".",'0'+version,".",'0'+dp8390_version,CR,LF,'$'

no_hp_msg    db    "No HP PC LAN card found (matching io_addr or int_no if spedified).",CR,LF,'$'
cfg_err_msg    db    "Configuration failed. Check parameters.",CR,LF,'$'
int_no_name    db    "Interrupt number ",'$'
io_addr_name    db    "I/O port ",'$'

comment \

Here are the ID byte values for all released cards.  Bit 7 of the ID byte
for AT cards indicates bus width (as well as RAM buffer size).

The ID byte was added to give a unique number to every revision of every card
produced.  However, it is a little more than just a flat assignment; there is
some fields.  For driver software it is assumed the driver knows what bus it
is on (eg. AT verses MC):

The format of the ID byte (offset 0x07 from I/O base) is:

        7  6  5  4  3  2  1  0
        a  b  b  b  c  c  c  c
where,
        "a"   is the AT bus width bit
         0 =  8 bit AT cards (32K bytes of buffer RAM)
         1 = 16 bit AT cards (64K bytes of buffer RAM)

        "bbb" is for board revisions

        "ccc" is the LAN Media type
         000 = HP StarLAN-10
         001 = 10-Base-T (Ethertwist)
         002 = 10-Base-2 (ThinLAN)
         ??? = reserved for future

The current ID bytes assigned are:
        0x00 = (obsolete) HP27240 AT8  StarLAN
        0x10 = (obsolete) HP24240 AT8  StarLAN rev B
        0x00 = (obsolete) HP27241 MC16 StarLAN
        0x01 = HP27245 AT8  10-Base-T
        0x01 = HP27246 MC16 10-Base-T
        0x02 = HP27250 AT8  ThinLAN
        0x81 = HP27247 AT16 10-Base-T
        0x91 = HP27247 AT16 10-Base-T rev 1

NOTE:   All Microchannel cards are 16 bits wide.
        All 8 bit cards have 32K bytes of buffer RAM.
        All 16 bit cards (AT & MC) have 64K bytes of buffer RAM.
\

this_board_msg    db    "This board is an HP",'$'

ISA_name_list    dw    board_00ISA, board_10, board_01ISA, board_02, board_81
        dw    board_91
        dw    board_unk
MCA_name_list    dw    board_00MCA, board_01MCA
        dw    board_unk

board_00ISA    db    00h, "27240",0,60    ;AT8  StarLAN
board_10    db    10h, "24240",0,60    ;AT8  StarLAN rev B
board_00MCA    db    00h, "27241",0,60    ;MC16 StarLAN
board_01ISA    db    01h, "27245",0,60    ;AT8  10-Base-T
board_01MCA    db    01h, "27246",0,60    ;MC16 10-Base-T
board_02    db    02h, "27250",0,60    ;AT8  ThinLAN
board_81    db    81h, "27247",0,60    ;AT16 10-Base-T
board_91    db    91h, "27247",0,60    ;AT16 10-Base-T rev 1
board_unk    db    -1h, "Unknown HP272xx",0,60    ;just a guess.

; ISA DEFAULTS for io_addr and int_no,
; MCA DEFAULTS to first found.

DEF_IO_ADDR    equ    0300h
DEF_INT_NO    equ    3

MC_DEF_IO    equ    1
MC_DEF_INT    equ    2
MC_DEF_BOTH    equ    MC_DEF_IO+MC_DEF_INT

mc_def_req    db    0

int_no_table    db    3, 4, 5, 7, 9, 10, 11, 12

; Added for 27247 rev 1, interrupt numbers are no longer simply left shifted
; one for writing into the option register. Use a lookup table instead.
; Entries of 0xff are not valid for the card.

; Table for AT cards except 27247 rev 1

int_bits_0    db    0ffh, 0ffh, 04h, 06h, 08h, 0ah, 0ffh, 0eh ;ints 0-7
        db    0ffh, 04h, 0ffh, 0ffh, 0ffh, 0ffh, 0ffh, 0ffh ;ints 8-f

; Table for 27247 rev 1

int_bits_1    db    0ffh, 0ffh, 04h, 06h, 08h, 0ah, 0ffh, 0eh ;ints 0-7
        db    0ffh, 04h, 02h, 0ch, 0ffh, 0ffh, 0ffh, 0ffh ;ints 8-f

int_bits    dw int_bits_0

; First 3 bytes of the LAN Addres will identify the board as HP

hp_vendor_id    db    08h,00h,09h

    public    parse_args
parse_args:
;exit with nc if all went well, cy otherwise.
    test    sys_features,MICROCHANNEL
    jne    parse_args_mc
    jmp    parse_args_1

parse_args_mc:

; first determine if non-default values have been requested
; get_number will return requested value, -1, or carry flag set

    mov    di,offset int_no
    call    get_number
    mov    BYTE PTR [di+1], 0
    mov    WORD PTR [di+2], 0
    jnc    parse_args_mc2
    mov    BYTE PTR [di], 0ffh    ; error return, use -1 value

parse_args_mc2:
    mov    di,offset io_addr
    call    get_number
    mov    WORD PTR [di+2], 0
    jnc    parse_args_mc3
    mov    WORD PTR [di], 0ffffh    ; error return, use -1 value

parse_args_mc3:

    xor    al,al
    cmp    io_addr,0ffffh
    jne    parse_args_mc4
    mov    al,MC_DEF_IO

parse_args_mc4:
    cmp    int_no,0ffh
    jne    parse_args_mc5
    or    al,MC_DEF_INT

parse_args_mc5:
    mov    mc_def_req,al

;The following code to read the POS registers is courtesy of Racal-Interlan.

; channel selector resides at io 96h
; POS register base is at io 100h

; search thro' the slots for a 9210 card
    mov    cx, 8            ; for all channels(slots)

; channel select value for slots 0,1,2.. is 8,9,A etc
; start with slot 0, and then 7,6,5,4,3,2,1

get_01:
    mov    ax, cx            ; channel number
    or    ax, 08h            ; reg. select value
    mov    chan_sel,al        ; save each one, the LAST will right
    mov    dx, 96h            ; channel select register
    out    dx, al            ; select channel

    mov    dx, 94h            ; protect system board
    mov    al, 0a0h
    out    dx, al

; read adapter id
    mov    dx, 100h
    in    al, dx            ; adapter id - ms byte
    mov    ah, al
    inc    dx
    in    al, dx            ; adapter id - ls byte

; Check if HP
    cmp    ax, 0ca63h
    je    get_03

get_02:
    ; come back to here if card found does not match user
    ; requirements below

    loop    get_01

    mc_chan_off
    mov    dx,offset no_hp_msg
    jmp    error

get_03:        ; found an HP adapter, is it the right one?

comment \

The only POS registers defined for the Microchannel card (HP27246) are:

        0x100 = Adapter Identification LSB (0xCA) Read only
        0x101 = Adapter Identification MSB (0x63) Read only
        0x102 = Option Register Read/Write

The Option register bits are defined as:

        7 6 5 4 3 2 1 0
        a a a - b b b c

where,
        "aaa" is the I/O Base Address Relocation bits
         000 = 0x0400 to 0x041f
         001 = 0x1400 to 0x141f
         010 = 0x2400 to 0x241f
         011 = 0x3400 to 0x341f
         100 = 0x4400 to 0x441f
         101 = 0x5400 to 0x541f
         110 = 0x6400 to 0x641f
         111 = 0x7400 to 0x741f


        "bbb" is the Interrupt Level bits
         000 = INT 3
         001 = INT 4
         010 = INT 5
         011 = INT 7
         100 = INT 9
         101 = INT 10
         110 = INT 11
         111 = INT 12

        "c" is the Card Enable / NIC Reset bit
         0 = NIC held in reset (eg. cannot access its registers)
         1 = NIC not reset (eg. regster can be accessed)
         NOTE: Access to the PROM should only occur while NIC is held in reset.

\

    mov    dx,102h
    in    al,dx
    and    ax,00e0h        ;leave only the base address bits
    push    cx
    mov    cl,12-5            ;now ends at bit 5, should end at bit 12
    shl    ax,cl
    pop    cx
    or    ax,400h
    mov    di,ax        ; temporary save

    in    al,dx
    shr    al,1
    and    al,7
    mov    bl,al
    xor    bh,bh
    mov    al,int_no_table[bx]

    ; check for matches with user selects

    mov    ah,mc_def_req
    test    ah,MC_DEF_IO
    jz    get_04
    mov    io_addr,di    ; user wants default, copy temp address

get_04:
    test    ah,MC_DEF_INT
    jz    get_05
    mov    int_no,al    ; user wants default, copy temp int number

get_05:
    cmp    di,io_addr
    je     get_06
    jmp    get_02        ; correct io_addr not found, keep looking

get_06:
    cmp    al,int_no
    je     get_07
    jmp    get_02        ; correct io_addr not found, keep looking

get_07:        ; if we get here we now have the io_addr and int_no
        ; that the user wanted
    mc_chan_off
    jmp parse_args_5

;
; Much simpler code for ISA machine parse_args
;
parse_args_1:
    mov    di,offset int_no
    call    get_number
    jc    parse_args_2
    cmp    WORD PTR [di],0
    jl    parse_args_2
    jmp    parse_args_3

parse_args_2:
    mov    WORD PTR [di],DEF_INT_NO
    mov    WORD PTR [di+2],0

parse_args_3:
    mov    di,offset io_addr
    call    get_number
    jc    parse_args_4
    cmp    WORD PTR [di],0
    jl    parse_args_4
    jmp    parse_args_5

parse_args_4:
    mov    WORD PTR [di],DEF_IO_ADDR
    mov    WORD PTR [di+2],0

parse_args_5:    ;Finally verify HP Vendor ID in 1st 3 bytes of station addr
    loadport
    setport    HP_PROM
    mov    di,offset hp_vendor_id
    mov    cx,3
id_card_loop:
    in    al,dx
    cmp    al, BYTE PTR [di]
    je    id_card_loop1
    mov    dx,offset no_hp_msg
    jmp    error

id_card_loop1:
    inc    di
    inc    dx
    loop    id_card_loop

; for 27247 rev 1, delete the next two instructions to allow inline execution
; of id_card
;    clc
;    ret


; for 27247 rev 1, changed this routine from "init_card" to "id_card" and
; called it from parse_args to verify argument int_no and print out all
; the driver name. This allows full verification of int_no before init_card
; is called. init card then becomes a big NOP, but must be declared so that it
; can be called from 8390.asm

id_card:
;Read PROM contents
    loadport
    setport    HP_PROM
    mov    di,offset curr_hw_addr
    mov    ax,cs
    mov    es,ax
    mov    cx,EADDR_LEN
    xor    ah,ah
id_card_1:
    in    al,dx
    add    ah,al
    inc    dx
    stosb
    loop    id_card_1
    in    al,dx            ;now get the checksum.
    xor    ah,al            ;add it in.
    cmp    ah,-1            ;now it should have all ones set.
;ugh.  The checksum was botched on some boards, so we can't use it.
;    jne    id_card_2        ;did it match?  Nope, return error.
    inc    dx
    in    al,dx            ;get the hardware revision number.

    test    sys_features,MICROCHANNEL    ;ISA or MCA?
    jne    is_16bit        ;MCA - all MCA cards are 16-bit cards.
    test    al,80h            ;16-bit system?
    je    check_16bit

; Only AT 16 bit cards get here, check for extended IRQ support on 27247 rev 1

    cmp    al,91h
    jne    is_16bit
    mov    bx, offset int_bits_1
    mov    int_bits,bx

is_16bit:
    or    endcfg,ENDCFG_WTS    ;yes, use word transfer mode.

; also use larger on-card memory for 16 bit -gft 910528

    mov    sm_rstop_ptr,SM_RSTOP_PG16

check_16bit:

    mov    bx,offset MCA_name_list        ;assume MCA
    test    sys_features,MICROCHANNEL    ;ISA or MCA?
    jne    check_board_name        ;MCA.

; ISA board here, verify interrupt value parameter, added for 27247 rev 1

    xor    bh,bh            ; clear hi half of bx
    mov    bl,int_no        ; index to the interrupt number
    add    bx,int_bits        ; get pointer to proper int_bits table
    cmp    byte ptr [bx],-1    ; check for not valid
    jne    check_board_ISA_name    ; int_no OK
    mov    dx, offset cfg_err_msg    ; int_no not valid, tough luck
error:
    mov    ah,9        ; Type the msg
    int    21h
    stc            ; Indicate error
    ret            ; Return to common code

check_board_ISA_name:
    mov    bx,offset ISA_name_list        ;Get the ISA name list now
check_board_name:
    push    si        ; for 27247 rev 1, save si
check_board_name_loop:
    mov    si,[bx]            ;get a pointer to a string.
    add    bx,2
    cmp    byte ptr [si],-1    ;is this the end?
    je    check_board_found
    cmp    al,[si]            ;is this the right one?
    jne    check_board_name_loop
check_board_found:
    inc    si            ;skip the board revision number.

    mov    dx,offset this_board_msg
    mov    ah,9
    int    21h

    mov    ax,ds            ;copy the driver name to where
    mov    es,ax            ;  we need it.
    mov    di,offset driver_name+3
check_board_copy:
    lodsb
    stosb
    or    al,al
    je    check_board_done_print
    call    chrout            ;print the character.
    jmp    check_board_copy
check_board_done_print:
    lodsb                ;copy the driver type number over
    mov    driver_type,al
    pop    si        ; for 27247 rev 1, restore si for caller
    mov    al,CR
    call    chrout
    mov    al,LF
    call    chrout

    clc
    ret
id_card_2:
    stc
    ret

; for 27247 rev 1, new init_card: the big NOP

    extrn    etopen_diagn: byte

init_card:
    clc
    ret


    public    print_parameters
print_parameters:
;echo our command-line parameters
    mov    di,offset int_no
    mov    dx,offset int_no_name
    call    print_number
    mov    di,offset io_addr
    mov    dx,offset io_addr_name
    call    print_number
    ret

code    ends

    end