TRS-80
- TRS-BOX
- Ira Goldklang’s TRS-80 Revived Site (trs-80.com)
- TRS-DOS (wikipedia)
- SDLTrs: TRS80 emulator
- TRS80GP emulator
- https://www.nutritionmodels.com/tedeschi/trs80/trs80.html
- http://www.vavasour.ca/jeff/trs80.html
- electrickery.hosting.philpem.me.uk/comp/trs80-4p/dmkeilImages
- Downloadable Disk Images
- Model2 archive
- Tim Mann
- Tim Mann’s LDOS page
- TRSDOS6 Programmer’s guide [local mirror 20210508]
Compatible Hardware Versions
-
Group1
- Model I
- Model III
- Model III, 4K RAM, Level I
- Model III 16K RAM, Model III BASIC
- Model 4
- Model 4: Non-Gate Array
- Model 4: Gate Array
- Model 4D
- Model 4P
-
Group 2: Model II family (memory map is compatible with standard CP/M-80)
- Model 2
- Model 12
- Model 16
- Model 16B
- Model 6000
-
Disk Operating Systems
-
Disk images format for emulators
- JV1
- single sided
- single density
- directory always on track 17
- 256 bytes per sector
- CANNOT be used in 8-inch drives
- JV3
- single or double side
- single or double density (with either FB (normal) or F8 (deleted) data address mark on any sector)
- In single density support nonstandard data address marks FA and F9
- support intentional CRC error in the data field
- DO NOT support incorrect track number or head number in a sector
- 128, 256, 512, or 1024-byte sectors
- DMK
- support of ALL the WD-1771 and WD-19xx controller functions and formats
- JV1
“on the old TRS-80 the boot sector had to be single density even when the rest of the disk was double density. I believe a couple of TRS-80 disk image formats use the byte-doubling trick as an easy and compatible way to represent single-density info in a format for double-density.”