From 2d21f3114fd85574d28839ea472dc39def596c58 Mon Sep 17 00:00:00 2001
From: Robbe Van Herck <robbevanherck1@gmail.com>
Date: Fri, 27 Dec 2019 17:57:36 +0100
Subject: [PATCH] Read all the sectors

---
 drive.bin | Bin 33 -> 3654 bytes
 main.asm  |  22 ++++++++++++++++++----
 2 files changed, 18 insertions(+), 4 deletions(-)

diff --git a/drive.bin b/drive.bin
index ade7f77b2f9b6af83ec28c2394d23a9c70ba570a..e6648792b53883ff7a0bc133e4a1e0ea6a982522 100644
GIT binary patch
literal 3654
zcmbtX?T*|w4D6%u0Sdpvp}7DBl53Nu{jasPyDVhcrw>1WhooeCahJ3}{~Y$bmPig~
zhTKm}@-y+8>rB%UmPDBgx!ISWX<TCVWAUXXauctdM~*l0f$?Sb6AqB)n&)Mr;^!5I
zIgUK>RAZr9D7Xu*CtvJpPqVv4M=tPdbp!o=ciD$fGhJOB`GOC5^uZ_2uNB9F=c|tr
zCi;=q<O?Iqt%kK0SNuRvg?w^_R@~xa@p|l(>A1|u4M`$n!h1ZgK27Y)Kp%a*u{?@&
z^=ZawT)i&2dL&#^M0!t}CIb3gkX*nE^O7!1m*C=r8^@Y5az?uNi@RzliASI1_V=zN
zDWfPv0BE2u)t$<riEoi}=9zHcio)@amjn@?9LmGzfu3)G^OoGklS2l0c^R2AMOPL<
z4F{d1i!7cCA{OL^6SE6GSBEoKG#BY2lbX;{@;BV?GA=LpnB;%t_5=oi0ES<zA;`gz
z17{}vS8%!WSObvystB~lavqrCO}z?l$C1JUCKMKE+AZic7_>~hG*n+JPV|WS-1+ET
zl=lYubs}F0_yoIf=7BzIH-I_%Bc*4&Kel>%;XpwcvUgsidV~_v;yOmtQ$Y>SxP6Ie
z0(!FU#60yL+JI6dX=}K3o2A{KUCxfOTiJt7oy&sy0@Mq8f%|HVL!^inM=u#~OQ>Z<
ze$tLk4BEIjsYcjJ0*hv+YJ_g|Wy4p6vG?k`VihTx=1^KqBD1D(3RM7;3OYR=w4}n(
zhBn3x^rw;>Wz)=>9Nj_H1kpB?o5)*M8(JcK%&Mub7^B#;sPZiM*;PRMsOGhXjiXDC
zPw(ymj9@Y*$hQ<g_`|TI{}B$QR?}z>_c@!!p*=6%+41>N{x5vFH|IQhqYT}A*zGD9
zCDAz8>_ovY1O2597Ry90^qU9N#U>(N?>z$(M8X9`UD7}=__~qF1ks)GT7jknL41aW
z|2UZ`0GJrP2J^u32WK}A)qptkZKq+^>>h06&CO<YuHM9<Md~h%wcU-})F}?Ld8q3R
zo5a76CM0$83r*f?$L-nOxCnnx)+uWp9vBG82{PSyo2nMrcfxr1rhx6P4vj$wd#eWe
z<p=I*o+*Zm+Q3PdV3&}$P);U|NYYFsz|bONsuh!ixr6w`KB>&+5M0QGg3%{TQ$Tlc
z^uia&2nmVV@7A)LvYI1|MG0WOCw)}xEui_t2OHrMoHw5UkBxRUVdWFxI${aeyRD<7
z55^GV5z<{zn-16|jm`ESbchpT+9&xfA@InhPT*S<ee6o=&i*({0Am|Jv-2aY0#M)4
zJZUUCwK?2}M>dz+#55I&q|GSX9GlIAQ92d}8|Zy9;nl;W`s_@#B;YN$i4_Z+W)bg)
z0iDc1&}Z2XB)y5-;xIemC_1}LVx+<|EGv-kUcUN*nJ==zTtHpj2&}I%-%M6G-CRTa
zySEFGH<z$*ofixkis+rRMSYfa0CX*r1)zZ}tUM-I^NqbSNlf>JgSg1)?9e9DW0<aK
z!J&PD8t6A6ie{mJ?(S{lE;!6k*)IO0g$a)4dfiTCQt6N|r0m+>(Q_)I-+X2x)GrXV
zxg;vv*^P4@AZ7brU+2%E$Ajv|<1Q(k8ZA|{sdd!$$gjE`b;m|9-Q^7F=E*o>3$(f6
z$rp4Vu?6__^hiU+kM-!C1^(=pC#&fu{b0>+=U;!V+XIaW;@n$pmIiwCy7~}O)vM`9
zEtq+2tu(FvU30-cE_1_v3mg}+!!jwNc(PU3{G;szZPhlN?Q7LQpKQ9eW<Vc(p;FvH
zpM8J>qyI~98{RLngC5J8)}rxkv_j~tCJyNXfzt^7x8E~;fyDU7!M>rHySD%u?3k69
zg72+!N73C!8rBIv-&j_8H87EBVVx)+zw-^H`w~YOi2XD){}QKEzOTu7?A&Ge=^vW#
BOJe{4

literal 33
ocmWH^$ShVUE-A{)OIJwF&rK~>NGr<ERme@v%`d7{u<~aB0MW$@y#N3J

diff --git a/main.asm b/main.asm
index 4986a18..b6ed11c 100644
--- a/main.asm
+++ b/main.asm
@@ -1,3 +1,5 @@
+DISK_ID EQU 0x81
+
 org 0x7C00                      
 bits 16                         
 
@@ -75,7 +77,7 @@ ret
 
 ; reset disk system
 mov ah, 0x00
-mov dl, 0x81
+mov dl, DISK_ID
 int 0x13
 
 ; print result on error
@@ -84,16 +86,23 @@ mov bl, ah
 call .puthex
 .reset_disk_no_error:
 
-; Read sector 1 into memory
+push byte 0
+.read_disk_loop
+pop cx
+inc cl
+push cx
+
+; Read sector dl into memory
 mov ah, 0x02
 mov al, 0x01    ; number of sectors
 mov ch, 0x00    ; cylinder number, low 8 bits
-mov cl, 0x01    ; cylinder number, high 2 bits + sector number (6 bits)
+; mov cl, 0x01    ; cylinder number, high 2 bits + sector number (6 bits)
 mov dh, 0x00    ; head number
-mov dl, 0x81    ; drive number
+mov dl, DISK_ID    ; drive number
 mov bx, .data   ; data buffer
 int 0x13
 
+jc .read_disk_error
 ; print result on error
 jnc .read_disk_no_error
 mov bl, ah
@@ -103,11 +112,16 @@ call .puthex
 ; print string
 mov bx, .data
 call .puts
+jmp .read_disk_loop
+.read_disk_error:
 
 .end:
 hlt
 
 .data:
 
+; print padding nullbytes
 times 510 - ($ - $$) db 0
+
+; write magic string
 dw 0xAA55
\ No newline at end of file