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retroclouds

Member Since 14 Oct 2007
OFFLINE Last Active Today, 6:56 AM

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Active Posts 1,070 (0.68 per day)
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Member Title Stargunner
Age 39 years old
Birthday January 5, 1973
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Website URL http://www.retroclouds.de

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Topics I've Started

Tunnels of Doom map generation algorithm

Sat Sep 17, 2011 2:46 AM

I came accross this very interesting blog that talks about map generation in regards to Tunnels of Doom.

It's actually 2 articles and fun to read. Apparently this guy got in contact with the original Tunnels of Doom programmer.

Tunnels of Doom! http://www.wp.me/pizxv-65

Coding maps (part 1) http://www.wp.me/pizxv-W9

and for the nerds among us: http://hbfs.wordpress.com

BASIC compiler section in Development Resources Thread

Thu Aug 18, 2011 8:00 AM

Hi,

I'd like to add a new section about BASIC compilers in the development resources thread.
The thing is that I'm not much of a BASIC programmer and I haven't used any of the BASIC compilers that popped up lately.

Anyone willing to feed me with some information?

What I'm looking for:

1) Disk image or reference where I can get the disk image
2) Possible (video) tutorial or simple step-by-step on how to use the compiler
3) Pro's and con's about the BASIC compiler

(*) Note: with BASIC compiler I also mean the Extended Basic compilers.

TI-99/4A website of the month

Sat Jul 30, 2011 9:07 AM

Each month I'd like to promote a website about the Texas Instruments TI-99/4A Home Computer.

This month I picked the website called "TI-99 forever!".

The website is in french, but don't let that scare you. Some of the stuff presented there is also available in english.
And you can always use google translator, you get the idea

This website has some very nice pictures about the TI-99/8 prototype and a lot of other stuff.
I bumped into it yesterday, while I was looking for a way to improve the picture quality of my TI-99/4A (PAL modulator hack).

http://www.ti99.com

CPU memory viewer

Thu Jul 28, 2011 12:46 AM

I wrote a little utility for watching TI-99/4A CPU memory. Did that for testing some subroutines of the spectra² library.

Upon program startup 2 threads are started.

Thread 0 is used for updating the memory location while navigating through memory (up/down=page up/down, left/right=line up/down)
Thread 1 is where the action is. It takes the current memory location and dumps memory to the screen.

The screen is constantly updated, so you'r kinda watching "realtime".

Here's the cartridge binary:

memview.zip 2.84K 2 downloads

Here's the source code:

Spoiler

********@*****@*********************@**************************
        AORG  >6000
*--------------------------------------------------------------
* Cartridge header
*--------------------------------------------------------------
GRMHDR  BYTE  >AA,1,1,0,0,0
        DATA  PROG0
        BYTE  0,0,0,0,0,0,0,0
PROG0   DATA  0                     ; No more items following
        DATA  RUNLIB
MSG0    BYTE  13
        TEXT  'MEMORY VIEWER'
*--------------------------------------------------------------
* Include required files
*--------------------------------------------------------------
        COPY  "D:\Projekte\spectra2\tms9900\runlib.a99"        
*--------------------------------------------------------------
* SPECTRA2 startup options
*--------------------------------------------------------------
SPVMOD  EQU   GRAPH1                ; Video mode.   See VIDTAB for details.
SPFONT  EQU   FNOPT3                ; Font to load. See LDFONT for details.
SPFCLR  EQU   >C0                   ; Foreground/Background color for font.
SPFBCK  EQU   >01                   ; Screen background color.
*--------------------------------------------------------------
* Variables
*--------------------------------------------------------------
TIMERS  EQU   >8342                 ; Address of timer table (8 bytes). Space for future slots reserved
MEMORY  EQU   >8350                 ; Current memory location
MEMOLD  EQU   >8352                 ; Backup memory location
RAMBUF  EQU   >8354                 ; Work buffer
***************************************************************
* Main 
********@*****@*********************@**************************
MAIN    BL    @SETUP                ; Setup screen
        JMP   SETUP2                ; Start memory viewer


        
***************************************************************
*      GENERAL SETUP -- GENERAL SETUP -- GENERAL SETUP
***************************************************************

* SETUP ..:
***************************************************************
* SETUP - Set up CPU memory and VRAM
********@*****@*********************@**************************
SETUP   MOV   R11,R3                ; Save R11
        BL    @SCROFF               ; Turn off screen
        BL    @CPYV2M        
        DATA  >0980,RAMBUF,10*8     ; Copy patterns of digit 0-9 from VRAM to RAM
        BL    @CPYV2M
        DATA  >0A08,RAMBUF+80,6*8   ; Copy patterns of letters A-F from VRAM to RAM
        BL    @CPYM2V
        DATA  >0800,RAMBUF,16*8     ; Copy patterns of 0-9,A-F to VRAM => set 1
        BL    @CPYM2V
        DATA  >0880,RAMBUF,16*8     ; Copy patterns of 0-9,A-F to VRAM => set 2
        BL    @CPYM2V
        DATA  >0F80,RAMBUF,16*8     ; Copy patterns of 0-9,A-F to VRAM => set 16         
        BL    @CPYM2V
        DATA  >0380,COLTAB,32       ; Load color table
        BL    @FILV
        DATA  >0000,32,32*24        ; Clear screen               
        MOV   @START,@MEMORY
        BL    @SCRON                ; Turn on screen
        B     *R3                   ; Return
*--------------------------------------------------------------
*  Some data used by subroutine
*--------------------------------------------------------------        
COLTAB  BYTE  >C0,>C0,>F0,>F0,>50,>50,>50,>50,>50,>50,>50,>50,>50,>50,>50,>50
        BYTE  >50,>50,>F0,>F0,>C0,>C0,>C0,>C0,>C0,>C0,>C0,>C0,>C0,>C0,>04,>04
T3      BYTE  8,>F0,>F1,>F2,>F3,>F4,>F5,>F6,>F7
START   DATA >6000                  ; Starting position
* :..

        
***************************************************************
*      MEMORY VIEWER -- MEMORY VIEWER -- MEMORY VIEWER
***************************************************************

* SETUP2 ..:
***************************************************************
* SETUP2 - Setup for memory viewer
********@*****@*********************@**************************
SETUP2  BL    @PUTAT
        DATA  >0018,T3              ; Display 0..7 at Y=0 and X=24        
        LI    R0,TIMERS
        MOV   R0,@WTITAB
        LI    R10,>0100             ; Set highest slot in use
        BL    @MKSLOT
        DATA  >0003,NAVI            ; Start navigator task
        DATA  >0103,DUMP,EOL        ; Start memory dump task
        B     @TMGR                 ; Run kernel task
* :..
        
                
* NAVI ..:
***************************************************************
* NAVI - Navigate through memory
********@*****@*********************@**************************
NAVI    DECT  STACK
        MOV   R11,*STACK            ; Save R11
        LI    TMP1,22*8        
        MOV   @WVRTKB,TMP0          ; Get keyboard flags
        COC   @KEY1,TMP0
        JEQ   NAVIA
        COC   @KEY2,TMP0
        JEQ   NAVIB
        LI    TMP1,8
        COC   @KEY3,TMP0        
        JEQ   NAVIA
        COC   @KEY4,TMP0
        JEQ   NAVIB
        JMP   NAVIZ
NAVIA   S     TMP1,@MEMORY
        JMP   NAVIZ       
NAVIB   A     TMP1,@MEMORY        
NAVIZ   B     @POPRT                ; Exit
KEY1    DATA  K1UP                  ; Up
KEY2    DATA  K1DN                  ; Down     
KEY3    DATA  K1LF                  ; Left
KEY4    DATA  K1RG                  ; Right
* :..
        
* DUMP ..:
***************************************************************
* DUMP - Take CPU memory dump
********@*****@*********************@**************************
DUMP    DECT  STACK
        MOV   R11,*STACK            ; Save R11
        MOV   @MEMORY,@MEMOLD       ; Take copy
        LI    R2,23                 ; 23 rows      
*--------------------------------------------------------------
*  Do initialisation
*--------------------------------------------------------------         
        MOV   @MEMORY,R0
        BL    @PUTHEX               ; Display current memory address
        DATA  >0013,MEMORY,RAMBUF,16               
        MOV   @ZTMP00,@WYX          ; Set cursor start position                        
*--------------------------------------------------------------
*  Display byte values
*--------------------------------------------------------------           
DUMP1   LI    R1,4                  ; 4 Columns
        ORI   CONFIG,>8000          ; Set display bit
        BL    @MKHEX
        DATA  MEMORY,RAMBUF,>F0     
        AB    @BD4,@BX              ; Next column
DUMP2   MOV   @MEMORY,R0
        MOV   *R0,R0                ; Display address
        ORI   CONFIG,>C000          ; Set bit 0-1 (display bit, next charset bit)
        BL    @MKHEX
        DATA  R0HB,RAMBUF,0         ; Dump word
        AB    @BD5,@BX
        INCT  @MEMORY               ; Next word
        DEC   R1
        JNE   DUMP2
*--------------------------------------------------------------
*  Display bytes as string
*--------------------------------------------------------------
        LI    R1,8                  ; Bytes to process
        MOV   @MEMORY,R0
        S     R1,R0
        LI    TMP1,RAMBUF
        MOVB  @BD8,*TMP1+           ; Set string length        
DUMP3   MOVB  *R0+,TMP2
        SRL   TMP2,8
        CI    TMP2,33
        JLT   DUMP4
        CI    TMP2,127
        JGT   DUMP4
        SWPB  TMP2
        JMP   DUMP5
DUMP4   LI    TMP2,>2E00            ; Display '.' character        
DUMP5   MOVB  TMP2,*TMP1+           ; Write byte
        DEC   R1                    ; 
        JNE   DUMP3                 ; Repeat until all bytes processed                        
        BL    @PUTSTR               ; Display string
        DATA  RAMBUF
*--------------------------------------------------------------
*  Update position counters
*--------------------------------------------------------------         
        AB    @BD1,@BY              ; Next row
        MOVB  @BD0,@BX              ; Start with column
        DEC   R2
        JNE   DUMP1
        MOV   @MEMOLD,@MEMORY       ; Restore current memory address
DUMPZ   B     @POPRT                ; Exit
*--------------------------------------------------------------
*  Some data used by subroutine
*--------------------------------------------------------------
ZTMP00  DATA  >0100                 ; Display position Y=2, X=0
* :..         
        END

File I/O in assembly language

Fri Jul 15, 2011 9:20 AM

I'm looking for some examples on how to do disk file access using TMS9900 assembly language
What I'm looking for is how to sequentially read a file, write a file, random access. Reading the catalog, etc.

What requirements are there in regards to VDP memory, scratch-pad memory, etc.
How to access the DSR.

Anyone ?

EDIT: hhmmm this is not related to the Tutankham project


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