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    Chopper Commander
  • Birthday 04/26/1968

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    Santiago de Chile
  • Interests
    Atari, piballs, arcades, 80's memorabilia
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    only pinball

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  1. Hi. I'm trying to add "attract mode" to my Gorgar, as Firepower have it. Can you share info? I Know asm and already pass disassembler damsx to green1 green2 and U14 game code. Z
  2. Here the schematic for a extra PIA: Here the interaction between the 800XL and PIA and how I connect the second one. Dashed line for D500 or D100 to choose. both address work fine for me, but if D500 is used, you can't run the cartridge. So, you can put another PIA! One in D100, two in D300 (standard) and three at D500. Also two extra outputs at CA2 and CB2! __________________________________________ Here PIA 2 setup at D500 ALL PORT-A INPUT 1 POKE 54530,56 2 POKE 54528,0 3 POKE 54530,60 Now PIA is ready to GET data 4 DATA=PEEK(54528) ALL PORT-A OUTPUT 1 POKE 54530,56 2 POKE 54528,255 3 POKE 54530,60 Now PIA is ready to PUT data 4 POKE 54528,DATA --------------------- ALL PORT-B INPUT 1 POKE 54531,56 2 POKE 54529,0 3 POKE 54531,60 Now PIA is ready to GET data 4 DATA=PEEK(54529) ALL PORT-B OUTPUT 1 POKE 54531,56 2 POKE 54529,255 3 POKE 54531,60 Now PIA is ready to PUT data 4 POKE 54529,DATA
  3. Here the interaction between the 800XL and PIA.
  4. With the original PIA, if you want more output or inputs, you are in trouble. I solve this problem like this: I take a good look at the 800XL schematic and see how the PIA talk with the CPU. Adress A0 A1 Data Bus D0 to D7, Clock 02, Reset, R/W, IRQ and...... CS2. There's the magic. (CS means Chip Select). The 800XL have a small 74LS138 chip at U2. This one decodes three adress (A8 A9 A10) to eight outputs. Each one to select chips from D000 to D700. Like this: PIN 15 D000 select GTIA PIN 14 D100 free PIN 13 D200 select POKEY PIN 12 D300 select PIA PIN 11 D400 free PIN 10 D500 cartridge (cctl) PIN 9 D600 free PIN 7 D700 free I already use D500 for many other mods, so, I know is a very safe direction to make anything. I use D500 U2 pin10 to pin 23 of the second PIA. Here is the equivalence between the standard PIA addressing mode and the second one: PORTA D300 54016 ==> D500 54528 PORTB D301 54017 ==> D501 54529 PACTL D302 54018 ==> D502 54530 PBCTL D303 54019 ==> D503 54531 All signals can be taken directly from the existing PIA (piggback) or from parallel port or cartridge port. The only exeption is CS2 (pin 23), this one must be connected to U2 pìn 10. Now, you can use both ports of this second PIA to have 16 extra outputs, or 8 inputs and 8 output... or what you want. And notice, you still having the PORTA free. The only issue: you cant use the cartridge and the second PIA at the same time. But if you dont use the cartridge.... no problem. Now I'm testing D100, aparently is absolute free and let me use the cartridge at the same time... testing. ZZT
  5. The Atari PIA PORTA Adr. D300 (54016) PORTA PACTL Adr. D302 (54018) PACTL Note: Don't mess with PORTB or your Atari may crash because three ouputs makes subcontrol between PIA and MMU (memory management). ALL PORT-A INPUT 1 POKE 54018,56 2 POKE 54016,0 3 POKE 54018,60 Now PIA is ready to GET data 4 DATA=PEEK(54016) ALL PORT A OUTPUT 1 POKE 54018,56 2 POKE 54016,255 3 POKE 54018,60 Now PIA is ready to PUT data 4 POKE 54016,DATA In booting process, PORT-A is set all input to read joysticks. If you want the oposite, type "all output routine". To back, type "all input routine", or just press reset. Warning, if you set PIA as all output, don't short any line to ground or Vcc or may damage the PIA. This is for the Atari PIA.
  6. The page cannot be found Thanks David_P, but I don't need instructions. I already have another PIA running very smooth on my 800XL. Just want to share the experience with other AA users.
  7. ¿No one? ¿anybody? ¿nobody?
  8. Hi folks. Few years ago I made an Atari controlled pinball. All works fine. I make a couple of custom cards to have more outputs, specifically to control the cpu lamps. All ok, but from the start I did'nt like the "comunication" method, too many wires, too many chips... I dream seeing outputs directly from the Atari guts, winning order and less electrical noise. As real pinballs are. Now I want to improve that issue for my next pinball. The Atari PIA let just 8 bits free (PORT A). Too short for big proyects. On pinballs some of the outputs must remain locked (on), dinamic scan not allowed. For that reason more outputs are needed. I made my research, focus on add a second PIA to my Atari, winning two 8-bits ports for a total of 16 outputs, or inputs. Now, I'm wondering if anyone has done this mod before (add another PIA), and the method used. I want to compare experiences and see if I did well or not.
  9. Oh dear... how I want a speech synthesizer for another pinball. For the moment I have to be happy with a Roland sampler.
  10. After a long time,I've been working on the cabinet artwork, to restore its original look. This is the result. Remember, I started from here:
  11. Maybe you're thinking in the centigrade 37 pinball, which originaly is a Gottlieb machine. This DMD goes for a Star Wars pinball, custom design. But the development of this one probably take me a little more time than the other. At least I have the cabinet, Star Wars Data East, with the artwork intact, this save me a lot of time and money in paint work. By the way, today I'm working in the cabinet spray of my centigrade 37.
  12. Scrolling text: *=$4000 inicio lda #43 sta 54018 ldx #255 stx 54016 setups lda #0 sta 54604 ; reset lda #0 sta 54602 ; latch lda #1 sta 54604 ; reset end lda #0 sta 54601 ; OE 0 lda #1 sta 54600 ; data 1 ldx #59 ; clock stx 6005 inicio1 lda #255 sta 54016 lda #1 sta 54603 lda #0 sta 54603 lda #1 sta 54602 lda #0 sta 54602 lda #0 sta 54600 leetabla ldx 6005 lda atariage,x sta 54016 ldx 6005 dex stx 6005 cpx #0 bne t1 ldx #60 ; tabla stx 6005 t1 jsr tiempo veces ldx 6004 dex stx 6004 lda 6004 cmp #0 bne t2 lda #59 sta 6004 lda #1 sta 54600 t2 jmp inicio1 tiempo ; rutina de tiempo lda #5 sta 6002 paddle lda 624 sta 6000 loop ldx 6000 dex stx 6000 lda 6000 cmp #0 bne loop loop2 ldx 6002 dex stx 6002 lda 6002 cmp #0 bne paddle ; fin rutina de tiempo rts atariage .byte 255,255,255,255,255 ; sp .byte 255,255,192,6,245 ; logo Atariage .byte 235,215,175,255,255 ; logo Atariage .byte 255,255,255,255,255 ; sp .byte 255,3,221,221,3 ; A .byte 255,253,1,253 ; T .byte 255,3,221,221,3 ; A .byte 255,1,237,237,19 ; R .byte 255,255,1,255 ; I .byte 255,3,221,221,3 ; A .byte 255,131,109,109,139 ; G .byte 255,1,109,109,125 ; E .byte 255,255,255 ; sp *=$02E0 .word inicio
  13. Check the PSU voltaje as first. If is good, take off the cover of your Atari, remove the shield, and looking for overheat chips. Overheat means that you can't keep your finger over the chip surface. A bad PSU (over 5V) typically fried some RAMS as first target. But, this is just a russian roulette. Years ago a bad PSU fried me two RAMS and the SO ROM. Have luck.
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