I put a DB25F on the back like a teacart RX02 and also a 40 pin female header just like the normal rackmount RX02. The 3.3V high level still satisfies the 5V TTL inputs of the LCD, so that is good. The Due at 3.3V is somewhat convenient because the SD card is 3.3V. The fact that it can at least read them puts it leagues in front of any other Apple II disk emulator I know of. You dont need Woz for anything but copy-protected game disks, other formats are fine for casual enthusiast use 99 of the time. There is just enough room otherwise for the six 2N7000s and the 180/390 ohm resistors and 40 pin header. Also, making write capability to Woz images a deal breaker is really a stretch. The TRS-80 is a monochrome computer from the late 70s. SDLTRS WII Its a Radio Shack TRS-80 Model I/III/4/4P emulator. This time, at least for XRoar, there are a lot of additions. It is perfect because it has a DIP area for the 74HC00 and surface mount area for the 74LVC14. Ive already released these emulators as plugins, but they were really minimalist ports. I used an Arduino Mega protoshield as Bela did. I've rechecked all the wiring/resistors/connector pinning/2N7000 operation (read they are static sensitive) but that is all good. I think it's time to haul out the logic analyzer and see what the deal is. I can only write properly to RX01s in bytemode format. On the Decmate, I can boot and read RX01 and RX02 disks with no problem, however writing is problematic. I didn't try the RX11 since it wasn't convenient. I have it working somewhat on the VT278, but no luck yet on the RX8E or RXV21. This will give you a lot more flexibility to run just about any DEC operating system by just swapping SD cards (or not even, given that the most recent SCSI2SD emulator can act as four SCSI device targets at once). That being said, another approach is to go with a QBUS SCSI card ($200-$400, depending) and a SCSI2SD emulator ($60). I modified my DL11-W for about $20 in parts. TU58 storage size is as least as good as RX02, and up to 3xRL02 capacity if you are willing to do a device driver patch. I did this mod to a DL11-W (single port serial card) for the UNIBUS by replacing the original 40P UART with a more recent version capable of 115.2K operation, and changing the master timing oscillator and divider chain to generate the correct clock rate. Transfer rate is not quite as fast, but TU58EM makes up for it in having an effectively zero seek time. Getting a serial card and modifying the UART and timing logic to allow 115.2Kbaud operation makes TU58EM about on par with the RX floppy drive.
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