Macintosh System Boot Disks
Did you find an old Mac system in the attic, but it won’t boot up? Was your Craigslist impulse buy delivered without any software? Do you need SCSI utilities to format your hard disk, or a terminal program to connect…
The End of Things
After predicting the end of the DB-19 connector supply for over a year, it’s finally happened. I recently sent my last stockpile of new-old-stock DB-19s to the board shop for assembly of more Floppy Emus. I have two left that…
USB to ADB – Multitasking Two Interfaces
It’s time for a new progress report on my USB to ADB converter project! My goal is to design a simple PIC32 device that enables USB keyboards and mice to be used with vintage ADB-based Macintosh and Apple IIgs computers.…
Crikey! USPS International Shipping Costs
Running a mail-order business gives me many opportunities to think about the cost of shipping. I’ve just made a change to the BMOW store that enables small, lightweight packages sent within the USA to be shipped by USPS First Class…
USB to ADB Progress – Good News and Bad News
I’m still chugging away slowly on this USB to ADB input translator concept, using a PIC32 starter kit. First the good news: the ADB end of things is pretty much finished. I’ve designed a demo that creates a phantom mouse…
Understanding the ADB Service Request Signal
In the comments section of yesterday’s post, I mentioned a concern about ADB’s service request (SRQ) mechanism. A device requesting service can pull the ADB bus low at a certain point midway through another ADB transaction, which is called an…
Apple ADB Traffic Sniffing
I’m continuing work on the USB to ADB input adapter for vintage Macintosh and Apple IIgs computers, and I now have an ADB traffic sniffer that’s more-or-less working. It doesn’t (yet) send any ADB traffic, but it displays ADB traffic…
Floppy Emu Firmware Update: Mac HD Menu
I’ve added a new feature to the Macintosh/Lisa firmware for the Floppy Emu disk emulator: a menu for selecting disk images while running in Mac hard disk emulation mode. This is the mode that enables Floppy Emu to function as…
USB to ADB Napkin Design
I’ve finished my rough-and-ready “napkin” design for a USB to ADB converter, building off the ideas discussed in my previous post. This device will enable modern USB-based keyboards and mice to be used with vintage ADB-based Apple IIgs and Macintosh…
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