The original DE500.COM packet driver checks MAC vendor code and 
"Sub Vender ID"(I don't know what it means), so cannnot be used
OEM hardware such as NEC VersaProNX VA300H.

  I succeeded to disable those checks.



Original File:
	DE500    COM     62391 97-01-31    1:59
	(included in 50kit290.zip from http://www.driverguide.com/)


**** "Sub Vendor ID" check ****

[original]
E785 53            PUSH    BX
E786 BB21D3        MOV     BX,D321
E789 813F1110      CMP     WORD PTR [BX],1011 ; checks "Sub Vendor ID"
E78D 7404          JZ      E793
E78F F9            STC                        ; Error: non-DEC
E790 BAA2B8        MOV     DX,B8A2	      ; address of error message
E793 5B            POP     BX

[modified]
E785 53            PUSH    BX
E786 BB21D3        MOV     BX,D321
E789 C7071110      MOV     WORD PTR [BX],1011
E78D 813F1110      CMP     WORD PTR [BX],1011
E791 90            NOP
E792 90            NOP
E793 5B            POP     BX
E794 C3            RET



**** ethernet vendor id check ****

[original]
E747 53            PUSH    BX
E748 BB21D3        MOV     BX,D321
E74B 83C314        ADD     BX,+14
E74E 803F08        CMP     BYTE PTR [BX],08
E751 7405          JZ      E758
E753 803F00        CMP     BYTE PTR [BX],00	; must be '00????'
E756 7512          JNZ     E76A
E758 807F0100      CMP     BYTE PTR [BX+01],00	; must be '??00??'
E75C 750C          JNZ     E76A
E75E 807F022B      CMP     BYTE PTR [BX+02],2B	; DEC but '08002B'.
E762 740A          JZ      E76E
E764 807F02F8      CMP     BYTE PTR [BX+02],F8	; OK, DEC '0000F8'.
E768 7404          JZ      E76E
E76A F9            STC				; Error: non-DEC Card
E76B BA3EB8        MOV     DX,B83E		; address of error message
E76E 5B            POP     BX
E76F C3            RET

[modified]
E747 53            PUSH    BX
E748 BB21D3        MOV     BX,D321
E74B 83C314        ADD     BX,+14
E74E C7070000      MOV     WORD PTR [BX],0000
E752 C64702F8      MOV     BYTE PTR [BX+02],F8
E756 807F02F8      CMP     BYTE PTR [BX+02],F8
E75A 90            NOP
E75B 90            NOP
E75C 90            NOP
E75D 90            NOP
E75E 90            NOP
E75F 90            NOP
E760 90            NOP
E761 90            NOP
E762 90            NOP
E763 90            NOP
E764 90            NOP
E765 90            NOP
E766 90            NOP
E767 90            NOP
E768 90            NOP
E769 90            NOP
E76A 90            NOP
E76B 90            NOP
E76C 90            NOP
E76D 90            NOP
E76E 5B            POP     BX
E76F C3            RET