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Messages - Keoni29
Pages: 1 ... 33 34 [35] 36 37 ... 168
511
« on: March 19, 2014, 10:24:12 am »
Here you go: a song that sounds like all pop songs of the past 5 years combined.
512
« on: March 15, 2014, 06:42:22 pm »
And another one done 
513
« on: March 14, 2014, 03:46:12 am »
I just ordered the memory. It will probably take a little while before it gets shipped to me, so that gives me some time to think about the extended filesystem. Because I made file headers variable-sized I can add things like extended addresses. Only the first block has an extended address, so the other blocks in the file cannot exceed a sector of 64KB. I might add something to work around that. The lower byte in the 'next_block_address' field of the block header is there just so the filesystem won't get confused. It is not actually used at the moment. I could use it to indicate that the file continues in a different 64KB sector.
514
« on: March 12, 2014, 08:41:20 am »
Axe is more optmized for the z80 more than any C compiler out there.
515
« on: March 12, 2014, 08:30:04 am »
I made a new thing:
516
« on: March 09, 2014, 01:36:35 pm »
I was going for that  In the composition I did not want to emphasize the fact that these are midi files (if that makes sense.) The reason why I started making midi music is because I found a folder with runescape songs on my harddrive a few weeks ago. It also inspired me to write a midi player for my eZ8 computer. The songs are available for download on my public dropbox folder https://dl.dropboxusercontent.com/u/52769784/rscape.zip
517
« on: March 09, 2014, 09:26:06 am »
Everything MIDI. Only post original work. Please only attach .mid files and not .mp3.
518
« on: March 08, 2014, 05:23:14 pm »
I just wrote a whole bunch of code. I can now search files, open them and read them as a continuous stream of data. Files can be more than one block large. It does not matter where the blocks are located because every block holds the address to the next block in its header.
519
« on: March 08, 2014, 06:04:21 am »
I wanted to design my own filesystem for the eZ8 computer. I wanted to make it very simple to implement. It has these features:
-Block size:512 bytes (4 bytes per block reserved for filesystem)
-16 character filenames
-Wear leveling
-File fragmenting
-Variable-size file headers
-Scratching files by writing just two bytes
-No need for file indexing
-No need to alter the file header when appending new data to a file
-Flags for things like: executable, system/user-file
-Extended addressing for accessing external media like flash roms
-No directories yet, but can be implemented later on.
File structure:
File header:
offset | size | function
+0 2 file identifier (0x0002 for start of file)
+2 2 size of header (not including first 4 bytes)
+4 16 filename
+20 2 flags: executable,system/user-file
+22 2 address of next block
+24 2 size of block
(+26 2 extended address)
-- Stream of Data --
Block header:
offset | size | function
+0 2 address to next block
+2 2 size of block (not including first 4 bytes)
-- Stream of Data --File identifiers:
0x0000 Scratched file (file can be erased if no free blocks are available)
0x0002 Start of file
0xFFFE Invalid. Used to identify the last block in a file.
0xFFFF Free block
What do you think about this filesystem? Any suggestions/foreseen problems?
520
« on: March 07, 2014, 03:46:31 pm »
I just hooked up the keyboard to the new board I made. Now I do not have to use the psion pocket computer for input anymore. This frees up the serial port for sending and receiving files from my pc. The midi files take up a lot of space in flash memory. I can barely fit 3 midi files on the internal flash. That's why I need to include some external memory into the eZ8 computer. I was thinking about using one of these 128Mbit flash roms: http://nl.farnell.com/spansion/s25fl127sabmfi101/memory-flash-128mbit-8soic/dp/2328002I can store about 300-400 midi files on this chip!
521
« on: March 06, 2014, 03:18:06 pm »
Added a userport. It has 3.3v, 5v, 8IO pins and serial rx tx The serial tx signal is shifted up from 3.3v to 5v so it can be used for stuff like midi.
522
« on: March 03, 2014, 04:32:47 am »
The eZ8 computer plays back MIDI files now!!!
523
« on: March 01, 2014, 04:49:41 pm »
You don't want to send an entire file back and forth for a pong game. You just need to send a couple of bytes every time the ball passes the edge of the screen.
These bytes are:
-Horizontal velocity
-Vertical velocity
-X/Y position depending on which part of the screen is facing the other calculator.
524
« on: February 28, 2014, 01:37:18 pm »
I am working on a header file that contains all the data you need to develop software for the operating system.
This sample program uses the syscall: puts (print text on screen/terminal)
;===================================================================================
; M E S S A G E B O X
; eZ8 OS sample program
;
; Description:
; Draws a box on screen
; Upcoming features:
; - Custom text in the box
;===================================================================================
include "eZ8OS.inc"
prg_org(14) ;Program resides in page 14 of file memory
prg_message:
push cr_x
push cr_y
ld cr_x,#30
ld cr_y,#15
str_out(str_box_h)
scrolldown
str_out(str_box_v)
scrolldown
str_out(str_box_v)
scrolldown
str_out(str_box_h)
pop cr_y
pop cr_x
ret
;===================================================================================
; D A T A A R E A
;===================================================================================
str_box_h:
asciz "+----------------+"
str_box_v:
asciz "| |"
;===================================================================================
; M A C R O'S
;===================================================================================
str_out MACRO str
ld R0,#HIGH(str)
ld R1,#LOW(str)
syscall puts
ENDMAC str_out
scrolldown MACRO
ld cr_x,#30
inc cr_y
ENDMAC
;-----------------------------------------------------------------------------------
525
« on: February 27, 2014, 04:01:08 pm »
New features:-Improved hex monitor -Syscall vector table -Midi! -Random improvements to the code -Blinking cursor I am also re-doing most of the comments. Example: ;===================================================================================================
; S Y S C A L L V E C T O R T A B L E
;===================================================================================================
org 0800h
;0800h : I/O operations ----------------------------------------------------------------------------
dw putc ;+0
dw puts ;+2
dw puts_r ;+4
dw putFd ;+6
dw puti ;+8
dw puth ;+10
dw 0,0,0,0,0,0,0,0,0,0 ;(reserved)
dw spi_transfer ;+30
dw spi_transfer_buffer ;+32
dw 0,0,0,0,0,0,0,0 ;(reserved)
dw midiout ;+48
dw 0,0,0,0,0 ;(reserved)
;0840h : Memory operations -------------------------------------------------------------------------
dw F_unlock ;+0
dw F_erase_page ;+2
dw 0,0,0,0,0,0,0,0,0,0,0,0,0,0 ;(reserved)
;0850h : Video operations --------------------------------------------------------------------------
dw gd_cpy ;+0
dw gd_copy ;+2
dw gd_fillmeup ;+4
dw gd_char_pal ;+6
dw 0,0,0,0,0,0,0,0,0,0,0,0 ;(reserved)
;0860h : Math routines -----------------------------------------------------------------------------
dw div_8 ;+0
dw 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0 ;(reserved)
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