Although EazyLink offers more features, YMODEM file transfers can triple its maximum speed, achieving 3K/sec at 38400bps regardless of OZ version. This is because the YMODEM implementation does not use the OZ serial driver, so it is not limited to lower baud rates by the driver issues in the original Cambridge ROM versions. By increasing the block size from 128K to 1K and batching files together, YMODEM increases efficiency.
Transferring the 256KB of OZ 4.7.1 ROM files will take around 1m25s - something that is an agonising order of magnitude slower on an unmodified Z88 constrained to 9600bps in Eazylink.
Z88 Setup
There are several ways to perform a YMODEM transfer on the Z88, which will depend on OZ version. Remember to set the serial transmit and receive baud rates to 38400 in Panel.
OZ Version | Popdown | Method |
|---|---|---|
5.0 | Filer | Tab to select multiple files, send batch using <>SB, receive a batch into the current directory using <>RB |
5.0 | Shell |
|
4.5 - 4.7.1 | ImpExport | Y for YMODEM, then C for CRC, then K for 1K block size. Wildcards are permitted for batch sending. |
2.2 - 4.4.1 | Y for YMODEM, then C for CRC, then K for 1K block size. Wildcards are permitted for batch sending. |
Computer Setup
On computer side, the recommended software is WindTerm since it is free and is available for Windows, macOS, and Linux. Configure as follows:
