Commit Graph

8 Commits

Author SHA1 Message Date
brandman211 0d768ef710 Finished the Memory Map. I think the cartridge logic needs to be separated. 2012-07-31 01:39:47 +00:00
brandman211 f66d92f2a5 Started filling the gaps in the Memory Map, getting up to 0x7FFF. Once complete, a lot of TODOs remain, the most important being the actual mapping of the cartridge. 2012-07-30 22:25:00 +00:00
brandman211 610acf6ad6 -Made MVI@ and ADD@ follow the stack and immediate mode rules for incrementing / decrementing the SP / PC.
-Disabled Intellicart hook for ReadMemory, which seemed to be interfering.
-Implemented MVO@.
-Several instructions are now executed in succession until it hits the unimplemented "XORR R5, R5".

I should probably refactor Disassemble and Execute to label registers as source / destination to avoid further confusion at some point. My disassembly might have the source / destination registers flipped as well.
2012-07-20 07:22:41 +00:00
brandman211 198c60af88 -Refactored ReadMemory so that both the core and cart addresses are read.
--Afterwards, the data is reconciled, right now by chucking out the core value if the cart responded.
-WriteMemory now writes to both the core and the cart unconditionally.
--Each case now breaks out of the switch statement in case we want to do more complex things at the end of the function later on.
-All default paths in both functions now throw an exception.
2012-07-18 06:19:03 +00:00
brandman211 0a3a392285 -Attempted to parse out memory attributes.
--In my test case, only a few segments were set to readable and nothing else was set. 0x1000, which is where the PC is initialized to, certainly isn't in a writable page.
--Although I've read that these memory attributes affect the Intellivision and not the Intellicart, I'm pretty sure this has to be implemented in the Intellicart so that my Read/WriteCart functions can choose to respond / not respond depending on these attributes. I very well could be wrong.
-Hooked Read/WriteCart into Read/WriteMemory.
-Implemented memory attributes into Read/WriteCart.
--TODO: Bank-switching.

TODO: Fine address table and memory attribute / fine address checksums.
2012-07-17 05:32:00 +00:00
brandman211 4f9539b73c -Made Executive ROM and Graphics ROM read-only. I still haven't made the memory map accessibility limited by the VBlank Period, but I'm assuming that should come way later.
-Initialized the memory devices with a tentative size that ignores the unofficial ranges.
-Masked addresses to match those sizes (That's my understanding of what the memory map needs to do based on other examples).
-Added the ICart interface.
-Started the Intellicart parser; got far enough to know that the files I'm working with are not Intellicarts. ^_^
2012-07-15 08:38:50 +00:00
brandman211 32baa013af -Made the memory map use ushort arrays because the Intellivision is 16-bit.
-Fixed JMP disassembly; I need to return on an invalid opcode because I was breaking out of the inner switch statement, not both that and the outer one.
2012-07-09 23:19:57 +00:00
brandman211 f3ce111c48 Checked in memory map...I need to stop programming and start sleeping. 2012-07-09 19:41:49 +00:00