trs80: Add reboot support, remove now surplus timer ack, init irq mask properly

diff --git a/Kernel/platform-trs80/trs80.s b/Kernel/platform-trs80/trs80.s
index 965ee89..6b3c56d 100644 (file)
--- a/Kernel/platform-trs80/trs80.s
+++ b/Kernel/platform-trs80/trs80.s
@@ -68,12 +68,25 @@ _platform_monitor:
            halt
 
 platform_interrupt_all:
-           in a,(0xef)
            ret
 
+;
+;      We write the following into low memory
+;      out (0x84),a
+;      inc a
+;      out (0x9c),a
+;      .. then resets into ROM (see the technical reference manual)
+;
 _platform_reboot:
           di
-          halt
+          ld hl,#0x84D3                ; out (0x84),a
+          ld (0),hl
+          ld hl,#0xD33C                ; inc a, out (
+          ld (2),hl
+          ld a,#0x9C                   ; 9c),a
+          ld (4),a
+          xor a
+          rst 0
 
 ; -----------------------------------------------------------------------------
 ; KERNEL MEMORY BANK (below 0xE800, only accessible when the kernel is mapped)
@@ -83,6 +96,8 @@ _platform_reboot:
 _ctc6845:                              ; registers in order
            .db 99, 80, 85, 10, 25, 4, 24, 24, 0, 9, 101, 9, 0, 0, 0, 0
 init_early:
+           ld a, #0x24                 ; uart rx, timer
+           out (0xE0), a
            ld a, (_opreg)
            out (0x84), a
            ld a, (_modout)