# Alternative to MOS Technology 6522?

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#### halleffector

##### Member
In short, what should I use in place of the 6522 VIA?

The 6522 VIA seems quite expensive at $25 plus shipping. I'm assuming this price is just due to rarity and that this is a legacy part. For 8-bit computer projects that need a 6522 or equivalent, what would a cheap modern alternative be, if any? Using a microcontroller/arduino in a DIY manner is not an option as it defeats the purpose (then I might as well just use the microcontroller as the CPU itself, I'd like a reasonably "real" old 8-bit system). This is just a project for fun and to learn. #### ronsimpson ##### Well-Known Member Most Helpful Member #### halleffector ##### Member #### ronsimpson ##### Well-Known Member Most Helpful Member Check ebay.com There are some from ebay-US that are low cost. #### spec ##### Well-Known Member Most Helpful Member In short, what should I use in place of the 6522 VIA? The 6522 VIA seems quite expensive at$25 plus shipping. I'm assuming this price is just due to rarity and that this is a legacy part. For 8-bit computer projects that need a 6522 or equivalent, what would a cheap modern alternative be, if any? Using a microcontroller/arduino in a DIY manner is not an option as it defeats the purpose (then I might as well just use the microcontroller as the CPU itself, I'd like a reasonably "real" old 8-bit system). This is just a project for fun and to learn.
Could you use an i8255 or better, 82C55. I believe they are more freely available and cheaper.
https://en.wikipedia.org/wiki/Intel_8255
ftp://bitsavers.informatik.uni-stuttgart.de/pdf/intel/MCS80/98-153B_Intel_8080_Microcomputer_Systems_Users_Manual_197509.pdf

spec

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#### Nigel Goodwin

##### Super Moderator
Could you use an i8255 or better, 82C55. I believe they are more freely available and cheaper.
But vastly inferior, the 6522 was a MUCH better device.

#### spec

##### Well-Known Member
But vastly inferior, the 6522 was a MUCH better device.
Thx Nigel- it was just a thought.

spec

#### Sonic2k

##### New Member
A potential solution would be to create a VHDL model of that 6522, and synthesize it to work in a CPLD, but that is probably way overkill.
That is what I do for very old, legacy chips and obsolete hardware.
I went and checked, all the 6522's I had are all long gone. IIRC they were used in Commodore machines?

As for the price tag, you are paying for NOS(new-old-stock) devices. Like I did several years ago when I got my hands on a tube of long discontinued AY-3-8910 chips. Cost an absolute fortune they did, but worth it.

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