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If I look at my MiSTer with IO board v 6.1, only thing which is free to use is user port.
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This needs either direct connection to FPGA, or some intelligent device on floppy side, to be able to read and write properly, correctly, and possibly in a better way than original hardware.Īs I said, I know how to read the disks, this is more like about some discussion about how to connect it to MiSTer in compatible way, compatible meaning with current IO board and expansion portfolio. You can see there is a graph with raw timings between read pulses in microseconds - there should be lines at 4, 6 and 8 microseconds, but you can see that it heavily varies with quality of the drive, and of course quality of the disks. The page on shows exactly where is the problem with connection to MiSTer. What do you think ? Any ideas ? Did someone already did this ?įloppyint.jpg (381.29 KiB) Viewed 9486 times I don't know, I though this will be a fun weekend project, but it turns out that doing this in a proper and compatible way is not so easy. I can of course sacrifice some peripheral on MiSTer to wire all signals from the floppy via level converter into FPGA (VGA port comes into mind, as I am not using it at all, I am using HDMI, and for VGA use there is HDMI-VGA conversion), and do all of this processing inside FPGA or on HPS, but my aim was to stay compatible. Also, there is a variant of this using MiSTer HPS, but so far I did not figured out a way to wire the floppy to it.
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But this would need to have different disk formats inside ARM itself, and MiSTer would need to select this format.
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Second one is to use a ARM microcontroller to do all the heavy lifting with proper data synchronization, which would enable the use of a low-speed serial protocol to communicate with MiSTer, and possibly to use better algorithms to try to read as best as possible. This is a way to have interface independent on core and system, and add system-dependent processing inside each core. Right now, I am deciding between two approaches to a solid, proper, and maybe better reading and writing than original hardware - older floppy disks can be unreadable by Paula, but perfectly readable using better algorithms.įirst one is just modify this design for larger CPLD, add oscillator to it, timestamp read pulses for further processing inside MiSTer FPGA, and do the same with write pulses - send them with timestamp, and write them from some FIFO with exact timing.
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This poses problem with data decoding, albeit I was able to read some sectors, and was able to detect MFM preamble on real Amiga-written disks. Current setup depends on SPI-like interface timing, and the phase of the signal is modified via data transfer. And this is exactly the problem with current SPI-like interface - the DPLL needed to properly read the floppy needs to have actual phases read as precise as possible, to be able to lock to signals from older floppy disks, or using older drives with not so much disk rotation precision. These are analogue-ish signals, and they need to be handled with precise timing to achieve good reading and writing. I've created quick PCB to wire that together, and to form some sort of "breadboard".īidirectional control signals between floppy and Amiga are not high-speed at all, but the actual problem are signals for disk reading and writing. This actual version uses only 4 wires from that user port, and there is a high-speed SPI-like interface between MiSTer and Xilinx CPLD I had laying around. If I was to stay compatible with MiSTer addons and boards, I was stuck with USB3 connector for user port, which is unused in Amiga core.
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This has some drawbacks from the beginning, because the ordinary PC floppy is not compatible, and itself needs some hacking or proper Amiga signal emulation. Because of what I know, I chose Amiga core to tinker with, and I am using a ordinary PC floppy drive. At first, I thought it should be easy, but it turned out that doing that flawlessly is hard. I've decided to wire an actual floppy drive to MiSTer. floppy data write with write precompensation is done with bugs current version does not need specialized interface, just level conversion 3V3 -> 5V on GPIO EDIT : Some time passed since this first post, and there is actually some progress on Minimig external floppy drive.