mirror of
https://github.com/JetSetIlly/Gopher2600.git
synced 2024-06-23 06:52:22 -04:00
39fd8381dd
Write() all cartridge types are now poke-able all cartridge types are no patch-able reworked error types/messages. replaced some errors with panics
55 lines
2.2 KiB
Go
55 lines
2.2 KiB
Go
// This file is part of Gopher2600.
|
|
//
|
|
// Gopher2600 is free software: you can redistribute it and/or modify
|
|
// it under the terms of the GNU General Public License as published by
|
|
// the Free Software Foundation, either version 3 of the License, or
|
|
// (at your option) any later version.
|
|
//
|
|
// Gopher2600 is distributed in the hope that it will be useful,
|
|
// but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
// GNU General Public License for more details.
|
|
//
|
|
// You should have received a copy of the GNU General Public License
|
|
// along with Gopher2600. If not, see <https://www.gnu.org/licenses/>.
|
|
//
|
|
// *** NOTE: all historical versions of this file, as found in any
|
|
// git repository, are also covered by the licence, even when this
|
|
// notice is not present ***
|
|
|
|
// Package patch is used to patch the contents of a cartridge. It works on
|
|
// cartridge memory once a cartridge file has been attached. The package does
|
|
// not implement the patching directly, rather the different cartridge mappers
|
|
// (see cartridge package) deal with that individually.
|
|
//
|
|
// This package simply loads the patch instructions, interprets them and calls
|
|
// the cartridge.Patch() function. Currently only one patch format is
|
|
// supported. This is an ad-hoc format taken from the "In case you can't wait"
|
|
// section of the following web page:
|
|
//
|
|
// "Fixing E.T. The Extra-Terrestrial for the Atari 2600"
|
|
//
|
|
// http://www.neocomputer.org/projects/et/
|
|
//
|
|
// The following extract illustrates the format:
|
|
//
|
|
// -------------------------------------------
|
|
// - E.T. is Not Green
|
|
// -------------------------------------------
|
|
// 17FA: FE FC F8 F8 F8
|
|
// 1DE8: 04
|
|
//
|
|
// Rules:
|
|
//
|
|
// 1. Lines beginning with a hyphen or white space are ignored
|
|
// 2. Offset and values are expressed in hex (case-insensitive)
|
|
// 3. Values and offsets are separated by a colon
|
|
// 4. Multiple values on a line are poked into consecutive offsets, starting
|
|
// from the offset value
|
|
//
|
|
// Note that offsets are expressed with origin zero and have no relationship
|
|
// to how memory is mapped inside the VCS. Imagine that the patches are being
|
|
// applied to the cartridge file image. The cartridge mapper handles the VCS
|
|
// memory side of things.
|
|
package patch
|