jharre
Experienced Member
Found a TeleVideo TS-802 and keyboard on eBay recently that looked like a reasonable deal for less than $100 delivered. {Of course, I didn't know that the seller was going to wrap the computer in brown kraft paper, tape it up, slide it into a box with 4" of space all around, then mail it Postal Select - it survived! They certainly don't make 'em like they used to.}
But, I digress. While waiting for it to arrive, I found that some kind soul published a ton of TeleVideo stuff on bit-savers and was able to use ImageDisk to create a couple new CP/M 2.2 diskettes. When unwrapped and powered on, it did attempt to boot, but both of the floppies had physical problems. I plugged in a good half-height floppy and, as you can see on the screen, it says it is booting then starts putting dots on the screen. It'll do this for hours.
I don't know if the dots mean it has read a sector or maybe it means it couldn't read a sector. The head never seems to move other than initially when the system is powered on or reset and it seeks to track zero.
The chips in sockets have all been reseated on the board. The cable from the mainboard to the floppy daughter and the cable to the drives have been removed and reseated. Voltages look pretty close. The display looks rock solid and the indicator leds on the mainboard do their dance at reset and stay off. I've made a few different boot disks in case one was marginal.
It just won't boot.
Some machines of this era had a monitor you use to see what's going on (like error codes from the WD1793 FDC), but the 802 doesn't seem to have this feature.
Anybody have ideas what to try next?
But, I digress. While waiting for it to arrive, I found that some kind soul published a ton of TeleVideo stuff on bit-savers and was able to use ImageDisk to create a couple new CP/M 2.2 diskettes. When unwrapped and powered on, it did attempt to boot, but both of the floppies had physical problems. I plugged in a good half-height floppy and, as you can see on the screen, it says it is booting then starts putting dots on the screen. It'll do this for hours.
I don't know if the dots mean it has read a sector or maybe it means it couldn't read a sector. The head never seems to move other than initially when the system is powered on or reset and it seeks to track zero.
The chips in sockets have all been reseated on the board. The cable from the mainboard to the floppy daughter and the cable to the drives have been removed and reseated. Voltages look pretty close. The display looks rock solid and the indicator leds on the mainboard do their dance at reset and stay off. I've made a few different boot disks in case one was marginal.
It just won't boot.
Some machines of this era had a monitor you use to see what's going on (like error codes from the WD1793 FDC), but the 802 doesn't seem to have this feature.
Anybody have ideas what to try next?