Avigo

last updated: 27. Sep 06

How to double the AVIGO internal 1Mbyte memory ?

Unfortunately it wasn't possible to replace the AM29F080-120EC (1MByte) chip inside the Avigo system. The reason was an operating system (OS) bug and/or an untested feature of the OS. Now I fixed the OS bug and you can replace the 1MByte chip with a 2MByte chip (AM29F016B-90EC or -120EC). My own Avigo is working with 2MByte internal and 2MByte external memory. But it's also possible to increase only the internal flash memory. My Avigo is working since end of April 99 without having problems. To change the Avigo OS V1.004 from Texas Instruments you will need my OSPatch program V1.1.

1 = internal flash AM29F080-120EC from AMD

2 = buzzer (replace the chip under the buzzer)

3 = TC551001BFTL-85L from Toshiba (for the display)

4 = quartz

5 = parts for the power supply

The following flashchip codes will be checked inside the Avigo operating system:

codes	manufacturer	type	maximum size	usable size
0x21B0	Sharp	LH28F004SC	4MBit	0.5MByte
0xA689	Sharp	LH28F008SC	8MBit	1MByte
0xAA89	Sharp	LH28F016SC	16MBit	2MByte
0x88B0	Sharp	LH28F032SU	32MBit	2MByte
0xA401	AMD	AM29F040	4MBit	0.5MByte
0xD501	AMD	AM29F080	8MBit	1MByte
0xAD01	AMD	AM29F016B-xxEC	16MBit	2MByte

This table shows that the maximum internal memory is 2MByte and the maximum external memory is also 2MByte. Larger chips like the Sharp LH28F032SU won't increase the total amount of memory. That means that the total memory handled by the Avigo operating system is 4MByte.

	Back up all your AVIGO data.
	Turn off your AVIGO Organizer.
	Remove battery cover and AAA batteries.
	Remove the screw from the expansion module cover and the cover itself.
	Touch a grounded metal object to remove harmful static electricity.
	Deinstall the memory expansion module (if installed).
	Remove the four screws from the AVIGO and use a knife to open the cover (carefully)

	Replace the AM29F080-120EC 1Mbyte flash memory with an AM29F016B-90EC(or -120EC) 2Mbyte flash chip from AMD. You need a very thin soldering equipment for doing that. The new chip is larger than the old one. So all solder pads are used (8 pads are not connected on the original module). The chip itself is under the buzzer.
	Replace the AVIGO cover.
	Install the memory expansion module (if available).
	Replace the expansion module cover, AAA batteries, and battery cover.
	Turn on your AVIGO. The organizer will detect the new available memory.
	Restore the internal operating software with AVIGO manager after using my OSPatch program V1.1

How to double the 1Mbyte external memory module ?

First you have to buy the additional external memory module (1MB) and after that you can replace the memory chip.

	Back up all your AVIGO data.
	Turn off your AVIGO Organizer.
	Remove battery cover and AAA batteries.
	Remove the screw from the expansion module cover and the cover itself.
	Touch a grounded metal object to remove harmful static electricity.
	Deinstall the memory expansion module.
	Replace the AM29F080-120EC 1Mbyte flash memory with an AM29F016B-90EC(or -120EC) 2Mbyte flash chip from AMD. You need a very thin soldering equipment for doing that. The new chip is larger than the old one. So all solder pads are used (8 pads are not connected on the original module).
	Install the modified expansion module.
	Replace the expansion module cover, AAA batteries, and battery cover.
	Turn on your AVIGO. The organizer will detect the new 2Mbyte expansion module.

The AM29F016B-90EC(or -120EC) is available from AMD (see http://www.amd.com for a local distributor) or take a look at http://www.segor.de for a very fast distributor in germany (page in german and english).

You can also build your own external memory expansion.

It's a 50pin ultra fine pitch (0.5 mm or 0.197") connector typ ??? available from ???, the AM29F016B-90EC (or -120EC) and a few connections between flash chip and main connector. The schematic is available here.