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BASIC microcomputer, based on Arduino

A microcomputer with PS/2 keyboard, SD card storage and composite video output, running Terminal-BASIC

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Schematic

  • 1 × Arduino MEGA 2560 compatible board A core system, running Terminal-BASIC interpreter and producing video output
  • 1 × Arduino MEGA 2560 32Kb RAM expansion shield Add 32 Kb SRAM, used by BASIC programs
  • 1 × Arduino PRO mini PS/2 keyboard controller
  • 1 × RCA female socket Video output
  • 1 × PS/2 or DIN-5 female socket ps/2 keyboard input

View all 10 components

  • Some 3D

    Andrey Skvortsov4 days ago 0 comments

    I try to do some 3D wireframe graphics with Terminal-BASIC matrix operations:

    The source is in the Terminal-BASIC team repository:

    10 REM 3D rotations using matrix operations
    20 REM FILL TABLES OF SIN AND COS
    30 DIM SC(1,255)
    40 LET D = 2.*PI()/256.
    50 LET A = 0
    60 FOR I%=0 TO 255
    65   A = A + D
    70   SC(0,I%) = SIN(A)
    80   SC(1,I%) = COS(A)
    90 NEXT I%
    100 REM Octahedron
    110 DIM V1(2,0), V1W(2,0)
    120 V1(0,0) = 0 : V1(1,0) = 0 : V1(2,0) = 40
    125 MAT V1W = V1
    130 DIM V2(2,0), V2W(2,0)
    140 V2(0,0) = -25 : V2(1,0) = 25 : V2(2,0) = 0
    145 MAT V2W = V2
    150 DIM V3(2,0), V3W(2,0)
    160 V3(0,0) = -25 : V3(1,0) = -25 : V3(2,0) = 0
    165 MAT V3W = V3
    170 DIM V4(2,0), V4W(2,0)
    180 V4(0,0) = 25 : V4(1,0) = -25 : V4(2,0) = 0
    185 MAT V4W = V4
    190 DIM V5(2,0), V5W(2,0)
    200 V5(0,0) = 25 : V5(1,0) = 25 : V5(2,0) = 0
    205 MAT V5W = V5
    210 DIM V6(2,0), V6W(2,0)
    220 V6(0,0) = 0 : V6(1,0) = 0 : V6(2,0) = -40
    230 MAT V6W = V6
    300 REM screen coordinates
    320 DIM VS1(1), VS2(1), VS3(1), VS4(1), VS5(2), VS6(2)
    330 LET A% = 0 : LET B%=0 : LET C%=0
    340 DIM RMX(2,2) : MAT RMX = IDN
    350 DIM RMY(2,2) : MAT RMY = IDN
    360 DIM RMZ(2,2) : MAT RMZ = IDN
    370 DIM RM(2,2)
    380 GOSUB 1100 : GOSUB 1200 : GOSUB 1300
    1000 REM main loop
    1010 K$ = INKEY$()
    1020 IF K$ = "d" THEN A% = A% + 1 : GOSUB 1100
    1030 IF K$ = "a" THEN A% = A% - 1 : GOSUB 1100
    1040 IF K$ = "w" THEN B% = B% + 1 : GOSUB 1200
    1050 IF K$ = "s" THEN B% = B% - 1 : GOSUB 1200
    1060 IF K$ = "e" THEN C% = C% + 1 : GOSUB 1300
    1070 IF K$ = "q" THEN C% = C% - 1 : GOSUB 1300
    1080 GOTO 1000
    1100 REM Update rot matrix z
    1110 IF A%<0 THEN A%=255
    1120 IF A%>255 THEN A%=0
    1130 RMZ(0,0) = SC(1,A%) : RMZ(0,1) = -SC(0,A%)
    1140 RMZ(1,0) = SC(0,A%) : RMZ(1,1) = SC(1,A%)
    1150 GOSUB 1400
    1160 GOSUB 9000 : GOSUB 10000
    1170 RETURN
    1200 REM Update rot matrix x
    1210 IF B%<0 THEN B%=255
    1220 IF B%>255 THEN B%=0
    1230 RMX(1,1) = SC(1,B%) : RMX(1,2) = -SC(0,B%)
    1240 RMX(2,1) = SC(0,B%) : RMX(2,2) = SC(1,B%)
    1250 GOSUB 1400
    1260 GOSUB 9000 : GOSUB 10000
    1270 RETURN
    1300 REM Update rot matrix y
    1310 IF C%<0 THEN C%=255
    1320 IF C%>255 THEN C%=0
    1330 RMY(0,0) = SC(1,C%) : RMY(0,2) = SC(0,C%)
    1340 RMY(2,0) = -SC(0,C%) : RMY(2,2) = SC(1,C%)
    1350 GOSUB 1400
    1360 GOSUB 9000 : GOSUB 10000
    1370 RETURN
    1400 REM Rotate points
    1410 MAT RM = RMX * RMY
    1420 MAT RM = RM * RMZ
    1440 MAT V1W = RM*V1 : MAT V2W = RM*V2
    1450 MAT V3W = RM*V3 : MAT V4W = RM*V4
    1460 MAT V5W = RM*V5 : MAT V6W = RM*V6
    1470 RETURN
    1990 END
    9000 REM procedure to project
    9010 VS1(0) = V1W(0,0)+100 : VS1(1) = -V1W(2,0)+90
    9020 VS2(0) = V2W(0,0)+100 : VS2(1) = -V2W(2,0)+90
    9030 VS3(0) = V3W(0,0)+100 : VS3(1) = -V3W(2,0)+90
    9040 VS4(0) = V4W(0,0)+100 : VS4(1) = -V4W(2,0)+90
    9050 VS5(0) = V5W(0,0)+100 : VS5(1) = -V5W(2,0)+90
    9060 VS6(0) = V6W(0,0)+100 : VS6(1) = -V6W(2,0)+90
    10000 REM procedure to draw figure
    10005 CLS
    10010 LINE VS1(0),VS1(1),VS2(0),VS2(1)
    10020 LINE VS1(0),VS1(1),VS3(0),VS3(1)
    10030 LINE VS1(0),VS1(1),VS4(0),VS4(1)
    10040 LINE VS1(0),VS1(1),VS5(0),VS5(1)
    10050 LINE VS2(0),VS2(1),VS3(0),VS3(1)
    10060 LINE VS3(0),VS3(1),VS4(0),VS4(1)
    10070 LINE VS4(0),VS4(1),VS5(0),VS5(1)
    10080 LINE VS5(0),VS5(1),VS2(0),VS2(1)
    10090 LINE VS6(0),VS6(1),VS2(0),VS2(1)
    10100 LINE VS6(0),VS6(1),VS3(0),VS3(1)
    10110 LINE VS6(0),VS6(1),VS4(0),VS4(1)
    10120 LINE VS6(0),VS6(1),VS5(0),VS5(1)
    10190 RETURN
    

  • Software update

    Andrey Skvortsov06/11/2019 at 19:51 0 comments

    New software, I'v just built, based on Terminal-BASIC 2.1-b1. It uses russian lexems, because the computer is used by my 5 years old daughter, who don't understand English and still can't read latin alphabet. Also I use my new ps/2 keyboard Arduino library, from https://bitbucket.org/starling13/libps2 . This library supports locales switching and controls the keyboard LEDs, as can be seen on the photo.

  • Load BMP file from SD-card

    Andrey Skvortsov03/31/2019 at 20:52 1 comment

    Terminal-BASIC 2.0-rc introduced UNIX-style file operations. This video shows the process of loading 1-bpp BMP file from SD-card. Yes, it's damn slow. Image was loaded by the following BASIC program:

       1 DEF FN BN% (BYT%, BIT%) = (BYT% \ (2 ^ BIT%)) AND 1
      10 INPUT F$
      20 GOSUB  1000
     100 END
    1000 REM LOAD
    1010 BMP% = FOPEN ( F$ )
    1020 IF BMP% = -  1 THEN PRINT "FOPEN" : GOTO  1995
    1030 B% = FREAD ( BMP% ) : M% = FREAD ( BMP% )
    1040 S$ = CHR$ ( B% ) + CHR$ ( M% )
    1050 IF S$ <> "BM" THEN PRINT "HEADER" : GOTO  1990
    1060 FOR I% =  1 TO  8 : B% = FREAD ( BMP% ) : NEXT I%
    1070 DP% = FREAD ( BMP% )
    1080 DP% = DP% + FREAD ( BMP% ) *  256
    1085 DP%=DP%-12
    1090 IF DP% < 0 GOTO 1110
    1100 FOR I%=0 TO DP%-1 : B%=FREAD(BMP%) : NEXT I%    
    1110 FOR Y%=191 TO 0 STEP -1
    1120   FOR X%=0 TO 24
    1130     B% = FREAD(BMP%)
    1140     FOR XX%=0 TO 7
    1150       POINTC X%*8+XX%, Y%, FN BN%(B%,7-XX%)
    1600     NEXT XX%
    1700   NEXT X%
    1710   B%=FREAD(BMP%):B%=FREAD(BMP%):B%=FREAD(BMP%)
    1800 NEXT Y%
    1990 FCLOSE BMP%
    1991 S$=GET$()
    1992 IF S$="" GOTO 1991
    1995 RETURN

  • Alternative firmware

    Andrey Skvortsov10/29/2018 at 14:21 0 comments

    This computers firmware is a variant of my Terminal-BASIC. It suffers from heavy weight, due to my limited abilities and C++ it's written in, but it is important for me as the window in the world of language translators and learning desk.

    But I start to think about the alternative firmware, which is a compromise between the simplicity and flexibility. It will be based on Z80 CPU emulator.

    On the host side there will be a piece of C++ code. First component is an  interactive monitor, allowing to view/modify the Z80 emulator ram, load and store ram portions to or from SD card, may be some assemble/disassemble in the future. The second component is a Z80 emulator calls library, allowing to call the native C++ functions from the z80 code.

    The main purpose of this firmware is the ability to write programs in C, using sdcc for z80, store multiple programs to SD card and run it without reprogramming the Arduino flash.

    Unlike great projects, running CP/M emulator on Arduino DUE, this approach gives the ability to use the boards with a cople kilobytes of RAM to run simple programs, as long as CP/M will not run with less then 64k RAM, and more need to an emulator itself.

    Compared to the Terminal-BASIC, which allows to run programs from SD card too, I expect, compiled C code, running in Z80 emulator to be much faster.

  • BASIC-microcomputer emulator

    Andrey Skvortsov11/17/2017 at 11:06 0 comments

    I'v published the sources of BASIC-microcomputer emulator for PC. It runs on Linux and depends on posixcpp and SDL2 libraries.

    It can be used to debug major parts of BASIC-microcomputer firmware (terminal-basic interpreter, TVoutEx library etc.) and to test what BASIC-microcomputer can do.

    Minimal BASIC test programs, tetris game and other test programs can be found here.

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Discussions

Samu Kiiski wrote 01/20/2019 at 08:47 point

Nice computer you have there. I made Dan's single chip computer with graphics, sound, external joystick, integrated keyboard and everything inside handheld wooden case, where only one cable leads to TV. I have made several programs and soon I'm out of removable eeproms. It is time to upgrade. You are only one who has TVout-library (I quess?) and SD-card at the same time. Dan wrote about issues with SD, still I must try it. I already ordered SD-module and 16Mb card for it. Do you have any advice for me and may I contact you later for any upcoming questions?

  Are you sure? yes | no

Andrey Skvortsov wrote 01/20/2019 at 19:27 point

I tested terminal-basic with ATmega1284 single chip computer (https://www.youtube.com/watch?v=0uTYnNounNI#action=share) but without SD card. This item uses Arduino MEGA. I think the issue with SD card and Dan's computer is in that some pins. need to use SD card,  are used in his design.

Feel free to contact me as your work will have a progress.

  Are you sure? yes | no

Samu Kiiski wrote 01/21/2019 at 03:28 point

Pins are used by eeprom. I would leave eeprom off completely when using SD-card and have it use internal 4k memory instead. He has code for this included. I'll wait for china-snail-mail to arrive and see what are the first results out of the box if I try unedited Dan's code. I'll contact you then :)

  Are you sure? yes | no

spikepavel1985 wrote 05/18/2018 at 01:54 point

Yes, this project runs well on DUE. No problems were detected at startup. Also, all the functions of this interpreter are modular, which allows you to customize it for yourself.

  Are you sure? yes | no

Martian wrote 10/05/2017 at 19:11 point

I really like this project, very interested in this version of BASIC, I've been using TinyBASIC in my Arduino Computer projects, but it's very limited.

I wonder if this project could be replicated with an Arduino Due, with it's 96K of RAM and a SPI based SD adaptor.

Nice project. ;-)

  Are you sure? yes | no

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