Re: HP 5061-6565 scsi loopback plug
On Mon, Jul 9, 2018 at 5:44 PM, Glen Slick wrote: > > (The earlier Feb 91 second edition version of the 12016-90001 manual > on Bitsavers does include the DDL Diagnostic Program Chapter 7, which > has the Table 7-2. Loopback Test Panel Configuration) I mean to type that the Feb 91 second edition version of the 12016-90001 manual does NOT include the DDL Diagnostic Program Chapter 7, that is why I referenced the Dec 92 third edition of the manual on hpmuseum.net
Re: HP 5061-6565 scsi loopback plug
On Mon, Jul 9, 2018 at 12:53 PM, Sven Schnelle via cctalk wrote: > > I'm actually the one who asked Al about this test hood. It seems like > it's a SCSI connector that connects the control lines to the data lines. > I've added some code which emulates this in software and the ROM said > 'test hood connected' after the HP98265A message, and waited 1 minute on > boot. The 300 Test software also passed all checks. I'll verify that on > real hardware, and post the connections. See also this manual on hpmuseum.net : 12016A_SCSIHostBusAdapterCard_InstallationAndReferenceManual_12016-90001_125pages_Dec92.pdf http://www.hpmuseum.net/document.php?hwfile=4790 Page 7-7 (Page 76 of the PDF), Table 7-2. Loopback Test Panel Configuration DATA0 <--> I/O DATA1 <--> C/D DATA2 <--> MSG DATA3 <--> REQ DATA4 <--> ACK DATA5 <--> ATN DATA6 <--> SEL DATA7 <--> BSY DATAP <--> RST No idea if the HP 1000 A-Series 12016A SCSI interface would use the same loopback connections, but it wouldn't surprise me if they did. (The earlier Feb 91 second edition version of the 12016-90001 manual on Bitsavers does include the DDL Diagnostic Program Chapter 7, which has the Table 7-2. Loopback Test Panel Configuration)
Re: HP 5061-6565 scsi loopback plug
Yea, it would have to be more than just a terminator as it would have to reflect back some of the control signals to the “ack” equivalents otherwise the controller would just see a bus with no devices on it. Presumably, the controller also has a “loopback” mode so that all the signals (including data) could be read/written and therefor checked. TTFN - Guy > On Jul 9, 2018, at 2:05 PM, Grant Taylor via cctalk > wrote: > > On 07/09/2018 12:33 PM, Al Kossow via cctalk wrote: >> No, it is specifically mentioned in the HP test tools manual 09800-90001 >> page II-82. > > Interesting. > > Thank you for correcting me. > > > > -- > Grant. . . . > unix || die
Re: HP 5061-6565 scsi loopback plug
On 07/09/2018 08:27 PM, Grant Taylor via cctalk wrote: > On 07/09/2018 11:58 AM, Al Kossow via cctalk wrote: >> Someone working on simulating the scsi DIO board in MAME asked me >> about the scsi loopback test plug. Anyone ever seen one? Is it just >> wires or are there active parts doing the loopback? > > I've never heard of loopback related to SCSI. I have seen many > external terminators that someone may miss-identify as a loopback > because it seems quite similar to a loopback for serial / parallel. > > Is this by chance what they are talking about I'm actually the one who asked Al about this test hood. It seems like it's a SCSI connector that connects the control lines to the data lines. I've added some code which emulates this in software and the ROM said 'test hood connected' after the HP98265A message, and waited 1 minute on boot. The 300 Test software also passed all checks. I'll verify that on real hardware, and post the connections. Regards Sven
