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Virginia
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I like to study retro computers and things of the like.
hendersonn's Achievements
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Aw nuts, guess I didn't go back far enough. Thanks a bunch, I think I have what I need now.
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Interesting, I must have missed that somewhere. That aside, I can assume the data and address lines are the same?
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Is this for the 28C64 or the 2732? I'd like to start by reading the latter on a breadboard via LEDs first. I'm also a little confused as both chips' datasheets refer to the chip select line as being active low; not to mention the absence of an inverter on the original cart.
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Hello, As a weekend project I've been trying to get a 28C64 working with on recycled Pac-Man cart board. I'm under the assumption the original PROM used was the 2732 based on a few text documents sprinkled on the web. The idea was to solder some jumpers to the cart's bare PCB, which in tern would be connected to a breadboard. As a test, I reinserted the 2732 onto the breadboard and successfully ran Pac-Man. Next I tried replacing the 2732 with the 28C64 and rewiring as needed to no success. The 28C64 has two copies of Pac-Man written to it, I have confirmed this with several tests: I can play the doubled Pac-Man ROM image in Stella, I have compared both the doubled and the original PROM image in a hex editor, as well manually checking the first few addresses of the 28C64 (by connecting the data bus to LEDs and grounding the appropriate address- comparing the LED output with the hex editor). All this makes the think the 28C64 is working as it should; when I try to manually read the 2732 in a similar fashion, I get no activity on the data bus. I'm curious if this is even a 2732 at all, maybe I have the address lines mixed up. I've confirmed that the (assumed) 2732 isn't fried multiple times as well, just to make sure. I must be missing something silly, hopefully you guys/gals can point me in the right direction. Thanks. tl;dr I'm trying to connect a 28C64 EEPROM to a Pac-Man board with the assumption that Pac-Man uses a 2732 PROM to no avail. ** I've searched the forums and google- but nothing turns up complete solutions.
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Hello, I fried my Supercharger for the 2600 (don't ask...) I really liked the device and would like to replace it. I opened it up and it looks like there is pretty much nothing I can do to repair it, so if anyone has one they'd like to let go, let me know.
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This is relevant to my interests; Good work!
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Could be the TIA, have you tried swapping it yet (assuming you have another on hand)? I'm sure you would've tried that, just thought I'd give some input.
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How are you guys sequencing your music?
hendersonn replied to hendersonn's topic in 2600 Programming For Newbies
I appreciate the input, thank you. -
Trying to figure out Keyboard Controllers / INPT*
hendersonn replied to hendersonn's topic in Atari 2600 Programming
Interesting; I wonder if a similar method could be used for new peripherals. Now that I think of it, I wonder if the CX-3000 utilized matrix decoding as well... Edit: I didn't bother looking into the graduate, I see the motherboard is well populated, so it probably does.- 15 replies
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"There's more than one way to skin a cat" as they say; I saw one thread someone made on how they put together some tunes (although I can't for the life of me find it now This), but it was a little confusing to follow. I thought It would be as simple as loading it from a bank (like a bitmap for player graphics) or something along those lines. I quickly realized it wasn't that simple. There doesn't seem to be a whole lot of documentation on this so I figured I'd just ask. My initial thought would be something like this (pseudocode): LDA Frequency1 STA AUDF0 DELAY LDA Frequency2 STA AUDF0 LDA TONE1 STA AUDC0 DELAY LDA Frequency3 STA AUDF0 DELAY Been going round and round with this; wondering how you all got your music going. Thanks for any input. Edit: I'm writing it in assembly; I'm not using bB.
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Trying to figure out Keyboard Controllers / INPT*
hendersonn replied to hendersonn's topic in Atari 2600 Programming
Fantastic, thank you.- 15 replies
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Trying to figure out Keyboard Controllers / INPT*
hendersonn replied to hendersonn's topic in Atari 2600 Programming
So did I miss something in the Stella Programmer's Guide? Going over the two source codes, I'm curious about something: How do you know which Input Port to check(and when)? From what I can tell, 0,1, and 4 deal with Player0 and 2,3, and 5 deal with Player1, but I'm confused on which order you check them- or if it even matters.- 15 replies
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Trying to figure out Keyboard Controllers / INPT*
hendersonn replied to hendersonn's topic in Atari 2600 Programming
Progress, thanks for all the help!- 15 replies
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Trying to figure out Keyboard Controllers / INPT*
hendersonn replied to hendersonn's topic in Atari 2600 Programming
I'll check it out when I get the chance, I appreciate it.- 15 replies
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Trying to figure out Keyboard Controllers / INPT*
hendersonn replied to hendersonn's topic in Atari 2600 Programming
Are there any resources available that explain the input ports a little more, I think that's where I'm getting stuck. Even when porting over the code that reads the ports, it isn't really doing anything- even with Stella set to Keyboard, the only visible effect on screen is from toggling the Joystick's fire button. Give me a second to upload a sample... Just to get a feel of how it works, I'm just trying to manipulate PF1 to show the change, nothing fancy. broken.asm- 15 replies
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