Network & Security IT - Le RSI
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Changing the SCSI target ID of a disk from a Sun SPARC station 4 or 5
Problem:The disk included in a Sun SPARC Station 4 or 5 answers to SCSI target ID 3, and there are no jumpers on it to change this configuration. Hence, if you want to add such a disk in another Sun SPARC Station that already contains one, there is a conflict because both disks have the same target ID.
- First of all, you need to find the model of your disk. this is usually written on a label placed on the back side of the disk. Here, the model is Quantum Fireball 1080. Then, you have to find the technical datasheet of this disk (by submitting the model of the disk as a query to you prefered search engine on the Web, for example). You can see here the one corresponding to our model.
- On this data sheet, you will find the location of the target ID jumpers (A0, A1 and A2). On Sun disks, the pins for these jumpers are often not present, but the connectors are present on the disk board. You can hence mimic the presence of a jumper by wiring the correponding connectors (A0 & A2 in our example).
- In order to see these connectors, you usually first have to remove the screws that fix the plastic piece surrounding the disk (see picture).
- More precisely, it is possible to change the target ID from 3 to 5 by wiring the two connectors corresponding to jumpers A0 & A2. This can be done by soldering them (see picture).
- Then, you only have to install the disk on one of the SCSI connectors of your SPARC Station, and to install the new disk. You can check that your manipulation has effectively changed the target ID by entering the boot prom monitor (press STOP-A during boot) and type probe-scsi. It should display the target IDs of all the SCSI devices of your system.
WarningThis solution is given without any warranty of success, nor warranty of inocuity for your material.
IP phone to analog phone interface circuit
At work, people usually do not get an analog phone line anymore since numeric or IP phones appeared. See how to connect your old analog device (modem, wireless DECT phone, Minitel) only using your IP phone to get the network access: read this.
Very low cost 20MHz signal generator for ham radio HF power amplifiers testing
Learn how to make a 20MHz HF signal generator using a few simple discrete analog components. Moreover, see how a 33 years old Tektronix oscilloscope gives better results than a numeric one bought recently. The whole story is here.
Split tunneling with Cisco
Enabling split tunneling with Cisco IPsec VPN Linux client software is always possible: read this.
Modelling IEEE Spanning Tree protocols using an UML Class Diagram
To really understand the dependencies between the many Spanning Tree protocols, I wrote an UML class diagram describing their relationships here.
Motorized camera controlled by the telephone
This project demonstrates how to drive a camera from the telephone line, any details here.
My Former Web Site
Since 04/26/01, I maintain a web site named www.fenyo.net. Since I made many updates recently, click here to access the original content, where old informations are kept. The photo is also from 2001 :-)
Agnes' Web Site
Agnes, my wife, maintains a web server where you will find plenty of original resources : free software from her own production, probability courses, exams' corrections, photos of her trips in the US... Do not hesitate to visit her site, she will be glad to see her access.log growing !
Canardou's Web Site
Canardou has always been for me a friend that really matters, helping me in every situation. According to informations currently available, Canardou could be affected by the H5N1 virus. So, for a few weeks, Public Health Bird Regulations have made me forbid Canardou to walk away from our appartement. Feel free to take news about him from his personal home page.