ii-vision/player
kris fa6c2bb25d Minor cleanups:
- Use a safe ZP address instead of $00
- Use dec instead of hex for IP address bytes
- Remove some unused Uthernet/W5100 defines

Optimize the socket buffer management
- Since we're guaranteeing 2K frame padding, the low byte is always 0
- Remove some vestiges of the Uthernet TCP demo code - AFAICT there
  isn't a need to compare high and low bytes of the S0RXRSR, this
  was just being used as a (slightly risky) check that they were both
  not equal (presumably to 0)
- (h/t Oliver Schmidt <ol.sc@web.de>) it turns out that the W5100
  automatically wraps the address pointer at the end of the 8k RX/TX
  buffer space, so since we're using 8k buffers we don't need any of the
  pointer/mask arithmetic to make sure we don't stray outside this range
- Instead, we can just save the W5100 address pointer before we start
  doing the stream buffer management and restore it when we're ready
  to read from the stream again.
- Moreover, since we know the low-byte is 0 we don't even need to
  save it.

This gives us enough free cycles to implement a keypress check.  For
now any key will pause the video and any other key resume it.

We still have a whole 16 cycles left over while maintaining the 36/37
cycle tick cadence.

We've saved 73 cycles of "dead time" though, i.e. the
op_ack + CHECKRECV + op_nop "slow path" now takes 2*73 rather than 3*73
cycles.  This should result in better audio quality.
2019-03-28 23:08:52 +00:00
..
make Move player to new location 2019-03-21 16:09:23 +00:00
apple2-asm-hgr.cfg Move player to new location 2019-03-21 16:09:23 +00:00
main.s Minor cleanups: 2019-03-28 23:08:52 +00:00
Makefile Rename binary 2019-03-21 16:23:56 +00:00