So TSL100.DO is a 3K file, that can be downloaded through TELCOM or the RUN"COM command. It's a text form of a BASIC program that creates TSLOAD.CO, a 526 byte CO program. But TSLOAD.CO doesn't do anything but loads DOS100.CO binary file. Which is 8k.
It all works... but if you go straight to TEENY which is only about 300 bytes more than TSLOAD.CO, then you have full ability to transfer files, including DOS100.CO if you want. More than one way to do it! -- John.