Subject: Re: [stella] Dumping ROM images From: "Eckhard Stolberg" <Eckhard_Stolberg@xxxxxx> Date: Sat, 12 Mar 2005 09:05:13 -0500 |
>I say to keep things simple. Several years ago I made a cart reader from a > 555, three 7LS161's and a 7400 NAND gate chip. I connected this to the > parallel port of a PC and wrote some code using QBASIC, hey it was what I > had. The 555 was set up as a one shot and was reset from one of the > signal > lines from the PC port, this was how I synced the PC to the cart reader. > Using this I ws able to dump the ROMs for Sir Lancelot and Moon Sweeper. > At > the time the ROM image floating around for Moon Sweeper was only 4K, it is > a > 8K game and some folks were looking for Sir Lancelot. I can't remember > the > details, I will have to check my old PC to see if the program is still on > it. It was nothing fancy but it worked. Unfortunately that's a bit too simple for bankswitched games. With this method you would always access all bankswitching hotspots in a row. So the data after the hotspot addresses will always be read from the last bank. In fact we had to add a special bankswitching mode to z26, because people kept complaining about these two ROMs. ;-) The games couldn't be started in the first bank, because the system vectors were read from the second bank. So we had to add a special bankswitching mode for these two F8 games were the game gets started in the second bank. Ciao, Eckhard Stolberg Archives (includes files) at http://www.biglist.com/lists/stella/archives/ Unsub & more at http://stella.biglist.com
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