Posted By
Hege
on 2016-05-09
16:35:54
|  Re: FPGATED
I always mix expansion port and user ports. Of course I mean expansion port because I am curious whether I can make it work with the 1551.
Those external ROM select signals not difficult to produce so can be done. I am however concentrating on creating a drop in chip to replace the original IC. The main problems are voltage level translation and chroma/luma signals. Implementing these needs PCB space as the FPGA is a digital device with 3.3v LVTTL pins.
I have tested FPGATED on a Smart TV and on a Sony CRT and it is working fine with both. Picture is sharp and clear.
Overheat will not be an issue, the FPGA is not so warm as the original IC. Protection on the keylatch is a good point, I have to investigate why and how original TED keylatch dies from autofire joys. I know there is already a document on it available on the internet but still don't fully understand why the latch dies.
By the way I have also an SFD1001 drive which I have to repair because its motor doesn't spin up (although I have already replaced its caps). The problem however is where to find floppy discs which are working with this drive... It needs different floppy than normal drives.
Regarding RS232 years ago I have created my own RS232 level converter for the plus4 using max232. I think for the mouse only a driver is needed (kernal modification maybe).
Currently I am cleaning up my verilog code, comment it and I want to upload it to GitHub. I will let you know when it is done, I ask for your patience.
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