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Member Since 15 Apr 2006
ONLINE Last Active Today, 8:03 PM

#4034065 AVGCart

Posted by a8isa1 on Yesterday, 8:46 PM

WIP: (S)IDE emulation


#4031128 Images generated by RastaConverter

Posted by a8isa1 on Sun May 20, 2018 10:00 AM

This one worked very well. 


Slight Chess dither, dither_val=0.5, dither_rand=1.2.



NTSC palette (see my sig).


PAL version


For intended saturation in Altirra bump it to 45 or in Atari800 use the palette in my sig.

Attached Files

#4030132 SIO Wifi modem with esp8266

Posted by a8isa1 on Fri May 18, 2018 3:14 PM



Out of curiosity and because of the cheap price I'v bought an ESP8266 also.


I was wondering if you could elaborate on what your setup is and which bobverter driver you used.


My ESP8266 is hooked up also to TX,RX,GND to my 130XE's SIO port and I have an UNOcart which can load BobTerm or Ice-T.

I'm using an 800XL with RAMBO XL, internal MyIDE, SDX 4.49c beta (on an Atarimax 8mbit cart).  I mostly use ICE-T, because of the 80 column support and the 19.2 kbits/sec speed.


I'm not aware of more than one bobverter driver.    I believe I once read that bob puff wrote a better driver than the original rverter driver.   Don't know if it's true or even if I'm remembering that correctly but don't really have a reason to use the original rverter driver.

#4029698 Images generated by RastaConverter

Posted by a8isa1 on Thu May 17, 2018 8:35 PM

Find your beach.


Ocean Cave. 65 colors.



Another favorite!  Thanks!

#4024930 Images generated by RastaConverter

Posted by a8isa1 on Thu May 10, 2018 12:14 PM

This one worked very well. 


Slight Chess dither, dither_val=0.5, dither_rand=1.2.



NTSC palette (see my sig).


Attached Files

#4024828 Images generated by RastaConverter

Posted by a8isa1 on Thu May 10, 2018 10:04 AM

Revisiting strong dithering (knoll, dither_val=8.0).  I'm shooting for lighting versus detail.



Would someone with real NTSC hardware try this and post comments?   Thank you.


If you wish to view with an Emulator try Atari800 using one of my palettes (see my sig)


In Altirra I don't know if importing a palette is possible (I can't find the option).  Select NTSC mode and in 'adjust colors' default XL, hue start -44, 24.1 degrees, and Saturation 30.

Attached Files

#4020702 Action! Versions?

Posted by a8isa1 on Thu May 3, 2018 7:18 PM

I definitely owned Action! 3.1, 3.4 and the final version 3.6.  I didn't keep the old versions.   I believe the upgrades were $20/each with cartridge exchanged.

#3990251 SIO Wifi modem with esp8266

Posted by a8isa1 on Wed Mar 21, 2018 7:20 AM


"I just connected the boards' TX, RX and GND lines (so far) to SIO" 


Is your NodeMCU still working?


My understanding is the ESP8266 module is not 5V tolerant. But the Atari SIO TX circuit is an open drain output with a 4.7k pull up resistor and 100 ohm series resistor - that would limit current into the device. So perhaps things are fine because there's limited current (maybe a couple hundred microamps) being shunted by the internal ESD protection circuit. 



Sounds reasonable but it's probably obvious that I don't know hardware.


Yep, both NodeMCUs have been working these past nine months. I can't say I use them very often on the Atari.  I still haven't repaired my svideo cable and ICE-T is virtually unusable via composite video.  I'll be more inclined to get it done if someone can patch The Learning Phone binary to work with the R-Verter driver.  Currently an 850 is required and I don't own one any longer.

#3981857 Mint Atari 800 photos

Posted by a8isa1 on Fri Mar 9, 2018 8:46 PM

A beautiful sight but it makes me sad.


My 800 has been on one desk or another since the day I took it out of the box in 1980 and it looks like it has.


At least, it still works.   

#3981185 Atari's Plato Cartridge question

Posted by a8isa1 on Thu Mar 8, 2018 8:56 PM

Update: My attempt to quote tschak909 didn't work correctly.


Posted by tschak909 on Mon Feb 19, 2018 8:17 PM


Somebody took TLP and made an xex out of it, and it has a very odd bug, where just before it finishes drawing the password prompt, the cart somehow falls out into the weeds and jumps to warm start....


Not a bug. There is some copy-protection being employed here.


At B863 exist 12 curious bytes. This is a bit of obfuscated code that is decrypted and copied from ROM to RAM in the subroutine at B84B.


       lda     #<(LB863-1)    ; Address of obfuscated code (well, minus 1)
       ldy     #>(LB863-1)
       ldx     #$0C           ; Initialize counter to 12
       jmp     sub_b84b


        sta     off_EC        ; Create pointer to obfuscated code
        sty     off_EC+1      ;

        ldy     #$00          ; Point to the first byte
        lda     #$55          ; Decryption key 01010101 



        iny                   ; Increment pointer index 
        rol     a             ; Rotate the key 01010101 -> 10101010
        eor     (off_EC),y    ; Decrypt the byte using exclusive OR
        sta     L3E33-1,y     ; Save the byte to RAM
        dex                   ; Decrement counter 
        bne     :@LOOP        ; Continue looping while counter not equal to 0

        jmp     L3E33         ; B860 4C 33 3E

LB863:  .byte   $65,$AA,$12,$F7,$49,$D5,$25,$A9
        .byte   $19,$DC,$B2,$CD



Here is the decrypted code. (Note: BFFC is in the ROM's address space and contains a 0).



       DEC $BFFC              ; Try to alter a ROM address from 0 to -1.
       LDA $BFFC              ; Load "altered" value into CPU.
       BEQ $3E3E              ; Still equal to 0? Yes, you're cool. RTS
       JMP COLDSV             ; No? Stinking Pirates! Reboot
       RTS                    ;


One de-protection solution is to change the 4C (JMP) at B860 to 60 (RTS) in the ROM file and re-convert it to an XEX.


- Michael

Here's the updated file:Attached File  TLP-2400c.xex   8.03KB   24 downloads.   It seems to work. At least, SHIFT+STOP (Atari SHIFT+START+S) doesn't cause it to kick out to BASIC.


I can't try it on real hardware, myself. I gave up my 850 long ago.

#3979864 How do I check the Weather on my Atari?

Posted by a8isa1 on Wed Mar 7, 2018 12:30 PM

I tried this on my Atari last night using APE over SIO2PC. I can't get past the "Press Return to Continue:" screen. There is a note above it stating:

" If you cannot get past this opening screen, you must use a different version of the "telnet" program--some of the ones for IBM compatible PC's have a bug that prevents proper connection. "

I was using ICET128 and ANSIVBXE terminal emulators. 

Has anyone had success getting through the first screen?

Try CTRL-J instead of Carriage Return.   If prompted take a guess at city code (I used BOS for Boston).  What you type won't echo. Don't forget to use CTRL-J


This works with each of my NodeMCU based wifi modems. One has Strikelink firmware and one has Zimodem firmware.




Sorry, I don't currently have a means to get screenshots from my real Ataris.

#3966235 Images generated by RastaConverter

Posted by a8isa1 on Sun Feb 18, 2018 5:53 PM

Ang-Ka National Forest. 59 colors.


Deciduous Forest. 54 colors.

Not sure which is which but the one on the left almost knocks off your Le Mans picture as my favorite.



#3963333 Images generated by RastaConverter

Posted by a8isa1 on Thu Feb 15, 2018 12:03 PM

Stargate SG-1 Prometheus38 colors.



The Le Mans pic remains my overall favorite conversion. However, this is another pic that looks like it might have been done by a pixel artist specifically for A8.  It is my favorite in this vein.  Kudos!

#3959394 Analmux passed away

Posted by a8isa1 on Sun Feb 11, 2018 10:15 AM

Very sad news  :(


RIP analmux

#3957692 Atari's Plato Cartridge question

Posted by a8isa1 on Fri Feb 9, 2018 1:02 PM

I patched the ROM image for 2400 baud but the "1200 baud" message was annoying me.   Here's a patch of the patch of the patch.



Attached Files