Re: [OT] sparc-->mac serial cable
On Tue, Jan 28, 2003 at 06:12:10PM +0000, Hugh Saunders wrote:
> Hello, i am attempting to build a serial cable so i can use an old mac
> laptop [powerbook510] to boot a sun sparc ipc and start it network booting.
> Google reveals the following pinouts:
>
> AppleMac [1]
> DIN8 Signal Description
> Pin
> ----------------------------------
> 1 RTS Handshake output
> 2 CTS Handshake input
> 3 TXD- Transmit data (inverted)
> 4 SG GND
> 5 RXD- Receive data (inverted)
> 6 TXD+ Transmit data
> 7 DCD General Purpose Input
> 8 RXD+ Receive data
>
> Sparc IPC [2]
> DIN8 Signal Description
> Pin
> ----------------------------------
> 1 DTR Data Terminal Ready
> 2 CTS Clear to Send
> 3 TXD Transmit Data
> 4 GND Ground
> 5 RXD Receive Data
> 6 RTS Request to Send
> 7 DCD Data Carrier Detect
> 8 RTXC Receive Clock
>
> My first question is: how do i wire it? do i try and match the pins up ie
> RTS-->RTS or do i cross over as in RTS-->CTS?
>
> Next question, whats with TXD[+-] on the mac but only TXD on the sparc? can
> i just use TXD+ -->TXD? [or TXD+ -->RXD if crossed over] then ignore
> TXD-?
I would wire TX+->RX, RX+->TX, and GND->GND, and leave the rest
unconnected at first, and if you really need hardware handshaking,
RTS<->CTS and CTS<->RTS. IIRC some systems also need DTR and /or DCD to
be wired high
Frank
> The weak debian link is that it will [if i ever get it booted]
> be a debian box :-)
>
> thanks,
>
> hugh
>
> Datafrom:
> [1]http://62.194.125.41:8080/pinouts/mac_pc_serial.html
> [2]http://www.stokely.com/unix.serial.port.resources/A-B-Ycablepinout.html#ipc.ipx.link
>
>
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