Put in musing about adding a handful of DOS syscalls, and why.syslinux-1.51

1 files changed, 15 insertions, 3 deletions

diff --git a/TODO b/TODO
index b6a89dda..7de43acc 100644
--- a/TODO
+++ b/TODO
@@ -8,6 +8,18 @@
 - EBIOS support.
 - FAT32 support?
 - Support initrd that span multiple input media?
-- Support a small set of DOS system calls for COMBOOT images?  (Serial
-  console support makes this particularly desirable.)
-- PXELINUX still needs work.
+- Support a small set of DOS system calls for COMBOOT images?  Serial
+  console support makes this particularly desirable; otherwise the
+  user could just use the BIOS I/O calls, but that won't work with the
+  serial port.  A feasible set would be the following:
+    00h	   - Terminate program
+    01h	   - Read char with echo (return char AL)
+    02h	   - Display character (in DL)
+    08h	   - Read Keyboard Without Echo (return char in AL)
+    09h	   - Display string (DS:DX -> end string in $)
+    0Bh	   - Check keyboard status (AL = 0FFh if char avail; AL = 00h if not)
+    30h	   - Get version number (return AX=0000h BX=0000h CX=0000h)
+    4Ch	   - Terminate program
+
+  ... in addition to INT 20h (Terminate program), of course.
+- Create or point users to a better PXE boot daemon.