I stumpled into several of these PC Boards today. They are the processor boards that went with the GPS system that also housed the famous $20 GPS Project Kit. They have mounting holes that match the receiver and also have a connector that matches the receiver.

The board is powered by the same cord that Mavin is selling with the receivers. From there it looks like a switching power supply, I suspect for a clean +5, +12 and something else for the Display.

Next to the Power jack is a RJ-45 phone type jack. It looks like it goes to a 'Simex SE232AE" chip. Pardon the eyes, they seem to not be able to read these tiny chips and I don't have a glass here. There are 6 caps near by so I suspect that this is a RS-232 chip.

One connector over from that is a power jack for the CD-ROM drive. Oh yea, I think I have a few of the CDs coming also. Did I forget to tell you that these things had an internal CD-ROM drive. Well I just did.

Going back the other way we have very small jack, Sub Mini or smaller. It has 7 solder pins, I think three are a switch, two info and two mechanical pins. No idea what it was for, maybe it talks, most of these GPS things do. Head phones, I guess.

One more over is a Mini Din jack. Different pin-out than on the receiver board. Looks like a PS-2 keyboard, hey cool. Several pins are ground, one goes to the Sub-Mini and the rest go the processor area. I didn't notice but I think one does have +5 on it.

Ok here is the last item on this side of the board. It matches the 8 pin power connector on the receiver board. It has ground and signal pins but due to the multi layer board I cannot tell if there are the other voltages present.

There is also a 40 pin IDE connector on the edge farther away from this end of the board. This is the interface to the CD-ROM drive. The system must have booted off the drive because the ROM on the board is fairly small. Map data was also stored there. I am going to be getting some of the disks and drives to play with.

To me, the most interesting part of the board is the power supply. It looks to be s switching supply. I guess to give clean power and regulated +12 for the CD-ROM. It looks like a LT1170 if that makes sense. Also some large caps and a transformer. After this is a 3 pin rectifier and a LM2940T. I see other diodes and caps but too hard to read.

Now the fun stuff, well maybe. I see a Analog Devices ADSP-MSP58-BST-104 chip with 3 cache chips and a crystal. The cache chips are ISSI IS61c256AH-20J. Any ideas, I have not looked it up yet.

See FAQ #9 and FAQ #10 for more info.

Move over DSP, come on down CPU. It's a Motorola MC68340FE16E with a ROM, 2 DRAMS (sorry no chips on this board, will know tomorrow), several glue chips and the interface to the CD-ROM.

Last is just off the edge is a 20K pot. I follow the traces a bit but one end goes to a cap by the DSP, another looks like ground in the same area and the third I cannot see.

Here is why all this is here. I have 30 for sale. My guy wants $30, he said that it will come with the board with no missing chips. Also, while supply lasts, the CD-ROM disk. I don't expect to make these work as a full system because we still have not found the displays yet, but it is a great way to examine the data transfer to and from the receiver. Also it may be modified and be very useful. Also, if we do find the displays, you know these will be gone. (What a sales pitch!)

Give my experimental Order Page a try and it should give UPS rates and total cost. If you have trouble with it, email me.

Email me for more info and I will save you one till the check arrives. After getting the email we will hold your unit for 7 days. If we do not get payment then we will sell it to the next person. Note: The first orders will get the CDs.

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