11

OK, this is very dusty material in my memory, so I'm relying a bit on Google/Wikipedia here. I may be able to find some of my printed documentation, but it will take a while. The granule was the allocation unit for the filesystem. I don't remember the granule size on single-density drives, but Wikipedia says for double-density drives it was 6 sectors per ...


5

The best resource is a book called TRS80 Disk and other mysteries. I found a copy online at: https://ia801709.us.archive.org/28/items/TRS-80_Disk_and_Other_Mysteries_1980_Harvard_C._Pennington/TRS-80_Disk_and_Other_Mysteries_1980_Harvard_C._Pennington_text.pdf My real copy is old and under a bunch of dust, but it does have the complete disk mapping ...


5

I can tell you as a former Radio Shack employee, we used to call them that as well. That said, I am happy with my still functioning, very modified Mod I.


3

/CMD files are a series of tagged records. Some record types have meaning only for certain features of some of the TRS-80 DOSes. Only two seem important for loading and executing them. byte: type byte: size* in bytes bytes[size]: data *size 0 → 256 bytes *size for type 1 only, size 1 → 257 bytes, size 2 → 258 bytes type 1: object code (...


1

After Googling this for an hour or two and not finding much, I have found something solid just minutes after posting my question! From page 40 of TRS8BIT volume 09 issue 02 from June 2015 there is an article on a "FreHD Expansion Interface" which includes this paragraph: If a WDC1771 Disc Controller is found then the LII ROM programs the chip to ...


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