Do not reject frames with a length exactly equal to the uIP bufer size.

cpu/6502/net/cs8900a.S

@@ -243,13 +243,13 @@ fixup29:lda rxtxreg
 	bne :+
 	inc cnt+1
 
-	; Is cnt > bufsize ?
+	; Is bufsize < cnt ?
 :	sec
-	lda cnt
-	sbc bufsize
-	lda cnt+1
-	sbc bufsize+1
-	bcc :+
+	lda bufsize
+	sbc cnt
+	lda bufsize+1
+	sbc cnt+1
+	bcs :+
 
 	; Yes, skip frame
 	; PACKETPP = $0102, PPDATA = PPDATA | $0040

cpu/6502/net/lan91c96.S

@@ -262,13 +262,13 @@ fixup24:lda ethdata
 	sbc #$00
 	sta len+1
 
-	; Is len > bufsize ?
+	; Is bufsize < len ?
 	sec
-	lda len
-	sbc bufsize
-	lda len+1
-	sbc bufsize+1
-	bcc :+
+	lda bufsize
+	sbc len
+	lda bufsize+1
+	sbc len+1
+	bcs :+
 
 	; Yes, skip packet
 	; Remove and release RX packet from the FIFO