Typos, formatting

1 files changed, 30 insertions, 17 deletions

diff --git a/README.md b/README.md
index b39634b..f01719f 100644
--- a/README.md
+++ b/README.md
@@ -15,10 +15,10 @@ Sound:    TBD
 
 Other features:
 
-* programable in ASM
+* programmable in ASM
 * TR-8 CPU
   - 16-bit registers: stack pointer (SP) and program counter (PC)
-  - 8-bit registers: 4 general purpose registers (a, b, x, y), flags refister (F)
+  - 8-bit registers: 4 general purpose registers (a, b, x, y), flags register (F)
 * frame interrupt (60Hz) and external IO interrupt
 * port based IO
 
@@ -46,7 +46,7 @@ On Linux install a C compiler and the development packages for the requirements.
 
 Example on Debian/Ubuntu using `sudo`:
 
-    sudo apt install build-essential libsdl2-dev libsdl2-image-dev libsdl2-mixer-dev
+    sudo apt install build-essential libsdl2-dev libsdl2-mixer-dev
 
 Then run `make`.
 
@@ -71,7 +71,8 @@ You can then compile and run the example with `make example`.
 
 The controller support d-pad with 4 directions, 2 action buttons, select and start.
 
-Read the port `0xf0` for the 8 1-bit flags reporting the state of the controller 1, and `0xf1` for controller 2.
+Read the port `0xf0` for the 8 1-bit flags reporting the state of the
+controller 1, and `0xf1` for controller 2.
 
 ```
 76543210
@@ -87,7 +88,8 @@ Read the port `0xf0` for the 8 1-bit flags reporting the state of the controller
 
 ### Palette
 
-Ports from `0xe0` to `0xef` can be used to select the colors to use in the 16 color palette from the 32 available.
+Ports from `0xe0` to `0xef` can be used to select the colors to use in the 16
+color palette from the 32 available.
 
 TODO: palette colours
 
@@ -132,7 +134,7 @@ fill_loop:
     inc x
     bno
     jmp fill_loop
-    ; x overfows, so we increment a
+    ; x overflows, so we increment a
     ; and decrement y (one 256 block done)
     inc a
     dec y
@@ -158,7 +160,8 @@ instructions:
 Set the address to that value. By default the starting address is `0x0000`.
 
 .db imm [, imm]  
-Literal byte. Label can be used with `<` prefix for the low byte of the address and `>`for the high byte.
+Literal byte. Label can be used with `<` prefix for the low byte of the address
+and `>`for the high byte.
 
 .dw imm [, imm]  
 Literal word.
@@ -253,11 +256,13 @@ Subtract the immediate value to r1, storing the result in r1.
 Affected flags: ZF, CF, OF, SF
 
 CMP r1, r2  
-Perform a SUB of r1 minus r2, without storing the result and only updating the flags.  
+Perform a SUB of r1 minus r2, without storing the result and only updating the
+flags.  
 Affected flags: ZF, CF, OF, SF
 
 CMP r1, imm  
-Perform a SUB of r1 minus the immediate value without storing the result and only updating the flags.  
+Perform a SUB of r1 minus the immediate value without storing the result and
+only updating the flags.  
 Affected flags: ZF, CF, OF, SF
 
 #### Bit Operations
@@ -279,7 +284,7 @@ Rotate r1 n bits to the right (0 to 7), storing the result in r1.
 Affected flags: ZF, CF, SF
 
 BIT r1, n  
-Test bit n (0 to 7) or r1, setting ZF if it is set or clearing it otherwise.  
+Test bit n (0 to 7) or r1, setting ZF if it is set or clearing it otherwise.
 Affected flags: ZF
 
 #### Jump and Call
@@ -288,10 +293,12 @@ JMP addr
 Set the PC to the 16-bit address.
 
 CALL addr  
-Store the next PC in the stack (16-bit address) and sets te PC to the 16-bit address.
+Store the next PC in the stack (16-bit address) and sets the PC to the 16-bit
+address.
 
 CALL [r1:r2]  
-Store the next PC in the stack (16-bit address) and sets te PC to the 16-bit address provided by r1:r2.
+Store the next PC in the stack (16-bit address) and sets te PC to the 16-bit
+address provided by r1:r2.
 
 RET  
 Return from a call by setting PC to the top 16-bit value popped from the stack.
@@ -341,10 +348,12 @@ Affected flags: BF
 #### IO, flags and Misc
 
 HALT  
-Stop the execution until there is frame interrupt. If the interruption flag is set, this will hang the CPU.
+Stop the execution until there is frame interrupt. If the interruption flag is
+set, this will hang the CPU.
 
 PORT r1, r2  
-Write the value of r2 in the port number provided by r1. If there is an output, the value will be stored in r1.
+Write the value of r2 in the port number provided by r1. If there is an output,
+the value will be stored in r1.
 
 NOP  
 No instruction has no effect.
@@ -354,7 +363,8 @@ Set IF, disabling the interrupt.
 Affected flags: IF
 
 CIF  
-Clear IF, enabling the interrupt. If called in an interrupt handler, it won't have effect. Use IRET instead to return from the interrupt to unset IF.  
+Clear IF, enabling the interrupt. If called in an interrupt handler, it won't
+have effect. Use IRET instead to return from the interrupt to unset IF.  
 Affected flags: IF
 
 CCF  
@@ -370,14 +380,17 @@ Clear overflow flag.
 Affected flags: OF
 
 IRET  
-Return from an interupt handler by setting PC to the top 16-bit value popped from the stack. It enables interrupts by clearing the interrupt flag.  
+Return from an interrupt handler by setting PC to the top 16-bit value popped
+from the stack. It enables interrupts by clearing the interrupt flag.  
 Affected flags: IF
 
 ### TR8 file format
 
 It is a binary file to be run on the TR-8.
 
-It doesn't have a header and it will be loaded at `0x0000` address. The execution will start on that address with interruptions disabled (interruption flag set).
+It doesn't have a header and it will be loaded at `0x0000` address. The
+execution will start on that address with interruptions disabled (interruption
+flag set).
 
 See the memory map for further information.