Yellowstone is inching slowly towards the start of manufacturing. One question that’s arisen is the type of surface plating to use on the PCB. The default / cheap plating is HASL or Hot Air Solder Leveling, which is just a…
While chasing down some Yellowstone hardware bugs, I discovered an unexpected analog-type behavior on the enable input of the Unidisk 5.25 (A9M0104). This is an active low digital input that’s used to enable or disable the disk drive. Under the…
Here’s the part of our program where I describe a problem I’m having, and somebody tells me what I’ve done wrong, because I’m not smart enough to figure it out myself. The problem is with the Yellowstone disk controller, the…
Discouraging news from the BMOW manufacturing front: the global chip shortage seems to be growing worse, and is now causing major problems for some of my vintage computer products. This is a change from a year or two ago, when…
The goal of a “do everything” disk controller for Apple II is getting closer to reality, thanks to the efforts of the hard-working beta testers. If all goes well, I’m hoping to have Yellowstone cards available for sale in the…
Help celebrate the opening of the new BMOW store with a Cyber Monday 10% off sale! You get a discount, I get more people trying the new store platform, and everybody wins. From now until the end of Monday, all…
Just in time for the holiday shopping season, the BMOW store has been completely rebuilt using an entirely new technology platform! This brings an armload of major improvements, including new payment and shipping options, the restoration of Australia and New…
When I first got involved with electronics, I assumed that my most important tool would be an oscilloscope. I bought a Rigol DS1074Z (mini review here), a nice four channel 70 MHz scope, but I’ve rarely used it during the…
In the world of Apple II disks, there are two major types of disk controller cards: the original Disk II controller (and clones), and everything else. Both have their place. The “everything else” category includes the Apple 3.5 disk controller…
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