scoggin@delmarva.delmarva.COM (John Scoggin) (05/19/91)
Please forgive my sending this info to the entire mailing list, but the return address at Udel.edu was bogus, so here goes ... To: cis.udel.edu@louie.udel.edu Subject: Re: 3com 3C501 Jumper Settings Needed, Please! Chris - The jumpers on a 3C501 are as follows: DMA Channel Default=1 INterrupt Level Default=3 IO Base Addr 300H Memory Base Addr Deafult=EC00H Mempry Enable Deafult=Disable Transc. Select Default=BNC (thin-net) IO Base Address Jumper Block The board uses 16 sequential I/O Addresses, starting at the I/O Base Address selected. You can set the board to select a starting address from 000H to 3F0H, inclusive. The base addresses are set in the jumper blocks in hexadecimal. The default address, 300H, is set-up as follows: 9 8 | 7 6 5 4 | 3 2 1 0 Hex 3 | 0 | 0 Jumpers 1 1 | 0 0 0 0 | * * * * (*=not applicable) Memory Base Address is ONLY USED if the optional EtherStart PROM is used. It may have a value from 00000H to FF000H in 4 Kbyte increments. The book is NOT clear on how this is done, but I suspect that it is similar to the I/O Base Address jumpers, but without the low-order 2 bytes... I am only about 5 miles from campus. If you would like, I could Xerox the 501 manual for you.... Hope this helps. ---------------------------------------------------------------------- John K. Scoggin, Jr. Supervisor, Network Operations Phone: (302) 451-5200 Delmarva Power & Light Company Fax: (302) 451-5321 500 N. Wakefield Drive Email: scoggin@delmarva.com Newark, DE 19714-6066