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Found 5 results

  1. This is a project idea we were chatting about on ##Atari today. The basic idea is that we make it possible for PBI devices to take over the system bus to perform DMA transfers at up to 1.7 megabytes per second. This is done by hooking into the way that ANTIC stops the CPU with a small riser board, and connecting /HALT and a new /DMA signal to two currently unused pins on the PBI. The device protocol would work like this: when a DMA transfer is desired, the device asserts /DMA. Every cycle that starts with /DMA asserted is a DMA cycle for the device *unless* /HALT was asserted before the cycle began, in which case the device has to relinquish to ANTIC. Devices can use the presence of /HALT at a high level during a read of the device's registers to detect whether DMA is present; if not, devices can fall back to programmed I/O. I whipped up a quick board layout for this; the board is also designed to generate a "clean" phi2 output as well as allowing the use of a W65C02 or W65C816 instead of 6502C. It does not support other 6502s or 65C02s which do not have the /BE input. Thoughts?
  2. While I think that the Lynx is just fine with its 6502 CPU, and understand why it didn't get a Motorola 680, I still wonder: What made Atari and Epyx make the final decision to use the MOS 6502 rather than, say, the Zilog Z80b, Intel 8088, or one from Hudsonsoft? What, other than cost possibly, made the 6502 their pick?
  3. Hello Everyone, I just got a hold of a Darth Vader and am trying to get it into working order again and am having video difficulties. It's a Rev 17 board and I'm currently in the process of putting in sockets as I remove the chips. The pictures attached show what my lovely screen looks like as is. Currently I have a known working RIOT chip in it and a new On/Off switch. The RF cable, Missile Command, joystick and power supply all work fantastically with my Woody, so if you have any suggestions that would be great. I was thinking the TIA chip, but before I start desoldering it, I thought I might get some ideas. Cheers
  4. I recently bought a broken intellivision off of eBay, and after messing around with it i believe that the problem is the CPU. I don't have a working unit, or any other units for that matter. I was hoping i could find a new cpu (preferably a whole board, in case there is any other problems with it) from someone on this form. I really want to try and play some intv games, especially since they are cheap.
  5. I always considered VCS marvel at engineering but, at the same time, it was always to constraining for me so I settled for less perfect but much more capable Atari 800. Some recently released VCS games seemed to achieve impossible. Quickly I found that some of the games have even more help from the cartridge than what was available back in the day in the form of Display Processor Chip (as used in Pitfall II). In those games it is ARM processor, hidden in Harmony / Melody cartridge, which does the heavy lifting and original CPU (6507) tries hard but can not really keep up. This led me to the following question: Would it make sense to plug in Harmony-like expansion in place of the VCS original CPU?
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