Dear Customers – First, I want to thank you all for your support and purchases since I first started selling my original Commodore PET ROM adapters in 2010. That was when I was still an undergraduate at the University of Washington in Seattle (Go Huskies). When I went for graduate school at MIT (Go Beavers) […]

Loyal customers – I am sorry, but getting set back up after the move is taking longer than expected. Reopening will be delayed until at least the middle of March. I apologize for any inconvience this may cause. Matthew

Loyal Customers – After 6 1/2 years here in Cambridge, MA I am finally finishing my PhD at MIT and have accepted a job back near my home in Seattle, WA. Due to all of the equipment needed to design and build the products I sell here at D’Asaro Designs as well as my extensive […]

If you have an Agilent 33220A function generator (or a related instrument) you should check out my new article on repairing the encoders. It seems that most of these generators are now having trouble with intermittent operation of the main knob and it is actually a really easy fix to correct this. Check it out […]

After selling out of the original 2006Prog SDA-2006 EEPROM programmers, I have released a new rev. 1 version. The major change is that the programmer socket is now unpowered except when the programmer is actively reading or programming a chip, reducing the risk of damage when a chip is inserted with the programmer turned on. […]

In a new article I outline some easy repairs that can be done to Tektronix TLA5202 (and related) logic analysers. Check it out here. -Matthew D’Asaro

I have released a new (Rev. 4) version my MPS6540 ROM adapters for the Commodore PET 2001. This new version makes assembly of the adapter easier, but makes no functional changes to the design. See all the details on the product page here and order the adapters on eBay here. -Matthew

It has recently come to my attention that the NCR 52801 is a drop-in replacement for the Motorola MCM2801 and thus it can be programmed in the 2801Prog programmer. I have thoroughly tested the 2801Prog with the NCR 52801 and have verified that it works. More more information see the 2801Prog product page here. The programmer […]

I had so much fun fixing up the two clocks I repaired to create this article that I wanted to do a couple more! A quick bit of looking on eBay turned up an alarm clock and a kitchen wall clock in nice condition with their boxes. I was able to easily fix both but […]

This update adds support for the following: -TI TMS-2532 EPROM (Was previously incorrectly listed with the 2332 family) -TI TMS-2564 EPROM (Was previously incorrectly listed with the 2364 family) -1702 EPROM Family: (1601, 1602, 1702, 1702A) -2704 EPROM -8332 and 9332 ROMs -MC68764, MCM68764, and 27HC641 EPROMs Get the updated list here.