Questions tagged [trs-80-model-iii]

For questions regarding the TRS-80 Micro Computer System Model III computer sold by Tandy Corporation

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3
votes
1answer
75 views

Do TRS-80 Model I and Model III load and execute /CMD files using specific memory addresses?

/CMD files on the various TRS-80 Model I and III OSes are machine code command files. They seem to have some internal format but not really a file header. They often start with 01 02 and then a 16-...
10
votes
1answer
108 views

In TRS-80 parlance when talking about disks, what are “granules” and “lumps”?

In my reading to try to learn about the disk layout, directory, and boot process of TRS-80 Model I and Model III, I see some unusual words come up again and again. Along with the common terms "track" ...
3
votes
1answer
79 views

What is the process for TRS-80 Model I & III to boot from disk?

I can find enough mentions of bootable disks for TRS-80 Model I and Model III to be confident that they could boot from disk, but so far I'm failing to find much info on how that worked. In ...
2
votes
1answer
45 views

What is the layout of the directory track on a TRS-80 Model I/Model III disk?

I've decided to add support for some more classic Z80 computers I used to use to my Ghidra modules, and the first Z80 systems I used were the TRS-80 model I and model III. I've found documentation ...
23
votes
3answers
4k views

Could you manually eject a floppy quick enough to prevent data loss?

I have the vague recollection of "Panic Ejecting" floppy disks by lifting the latch on the drive after immediately regretting a command I had typed. At the time, I was young, impulsive, and blessed ...
8
votes
2answers
170 views

How much control of TRS-80 Model III disk drives was possible from its Cassette (ROM) BASIC?

How much control over the TRS-80 Model III's floppy drive controller can be effected via relatively simple commands, typed into its built-in Cassette BASIC? My understanding is that general usage of ...
5
votes
3answers
523 views

What to check before powering on TRS80 Model III in unknown condition [duplicate]

Having managed to source a TRS-80 Model III that I'm told hasn't been powered on for quite some time (and I suspect this is a massive understatement), I'm worried that the first thing that might ...
7
votes
1answer
369 views

How much did the TRS-80 Model III weigh?

How much did the Radio Shack TRS-80 Model III weigh? I imagine it must have been quite a lot, with the computer, monitor, power supply and up to 2 disk drives all in the same case, but I haven't been ...
18
votes
3answers
798 views

Who coined the nickname “Trash-80” and what was the source of their animosity?

In the U.S. in the early 1980's (1980-1982, roughly), the TRS-80 Model I/III computers were commonly referred to by teens and youngsters as the "Trash-80". The best reason I can attribute to this ...
13
votes
1answer
494 views

How to use virtual cassettes with Matthew Reed's TRS-80 Model III emulator? (TRS32)

I'm fooling around with Matthew Reed's TRS-80 Model 1/III/4 emulator for Windows (TRS32) and am have trouble using virtual cassettes. I am using it to emulate a Model III with Level II BASIC. I have ...