Added start of csave command and bios write block

2026-10-09 16:13:50 +02:00
parent c84b3fdc97
commit a34ad82444
4 changed files with 296 additions and 3 deletions
@@ -106,6 +106,12 @@ boot_copy:
    jp          wait_silence
 .ORG BIOS_CAS_READ_BLOCK_DRY
    jp          read_block_dry
+.ORG BIOS_CAS_GET_BUFFER
+    jp          get_buffer
+.ORG BIOS_CAS_WRITE_BLOCK
+    jp          write_block
+.ORG BIOS_DELAY_MS
+    jp          delay_ms

 ; -------------------------------------------------------
 ; BIOS ENTRY
@@ -528,6 +534,27 @@ bank:
    out         (SYSTEM_REGISTER),a
    jr          2$

+; -------------------------------------------------------
+; Delay a certain miliseconds
+; needs a (ms, zero returns immediately)
+; uses b,c
+; @1MHz each iteration takes 1000T plus 23T overhead
+; -------------------------------------------------------
+delay_ms:
+    or          a               ; 4T
+    ret         z               ; 5T when not taken
+    ld          b,a             ; 4T
+1$:
+    ld          c,61            ; 7T
+2$:
+    dec         c               ; 4T
+    jr          nz,2$           ; 12/7T, loop takes 971T
+    nop                         ; 4T
+    nop                         ; 4T
+    dec         b               ; 4T
+    jp          nz,1$           ; 10T
+    ret
+
 ; -------------------------------------------------------
 ; Strings
 ; -------------------------------------------------------
@@ -536,4 +563,4 @@ msg_header: .db "BIOS v1.0 - Joppe Blondel",00dh,00ah,000h
 ; -------------------------------------------------------
 ; Other files
 ; -------------------------------------------------------
-#include "tape.asm"
+#include "tape.asm"