TGB1718

Could be because you're crossing a 4K boundary without a LMS instruction to go over the boundary

Must admit, after seeing/playing Missile Command (played it to death in the past), I'm considering a VBXE install

You can always pause the game (F9) with the debugger enabled and have a look at the display list and DINDEX ($57). But remember there is no fixed resolution, what is on screen in most games is highly likely a mix of character/graphics modes. So pausing may not show you the entire picture (excuse the pun ) , this is one aspect of the Atari that sets apart from most other computer of the day. The screenshot I posted earlier uses a dynamic display list which changes every vertical blank, so depends when you pause it Even the screen memory does not have to be contiguous, again in my example, the top of the screen starts at $B800 the middle sections are at $8000 and $B018 and the bottom portion is at $3000

Maybe he's referring to these sorts of colour changes

They are very different chips, as @Rybags said, the 41464 is a 4 bit * 64K chip, the address pins are very different (and others) to the 4164 which is a 1 bit * 64K chip. I don't know if the 800XL had a model with 2 chips, but yours has 8 so it has the be the 4164 variant I know that some 65XE, 130XE have either chip, but they are not interchangeable i.e. 2 or 4 for 65XE and 8 or 16 chip for 130XE I believe that the XEGS also uses the 41464 2 chip memory.

I noticed you've tried D2: and D4: , although it's saying those, I have had some software that still expects the files in D1: , just a thought

this will do what you need locations 88 and 89 hold the screen start address Simplify the code:- sc=peek(88)+peek(89)*256 for i:=0 to 959 do begin poke(sc+i,screendata[i]); end;

Try this https://atari.fox-1.nl/disk-formats-explained/

Just tried both the .car and the .xex in Altirra, both say VBXE NOT INSTALLED I have VBXE set to FX 1.26 and tried both base addresses, doesn't seem to detect VBXE am I missing something ? EDIT: Got it working, forgot U1M need to activate VBXE Very nice, thanks, pity you can't configure the mouse to simulate a trackball (maybe you can, but I can't find it )

This is my setup for using cursor keys and space bar for fire

You did Port 1 ?, if you did port 0, that's the mouse, I just set arrow keys to be joy 1 and StarRaiders works fine

Try clicking on the little Joystick icon on the top right screen

I have a GOEX that has FlashFloppy firmware installed, I simply format an SD card in Windoze FAT32 and copy .st files onto it, then mount whichever .st file I want, boot my ST and the disk is there as D1: For .PRG files, I use NetusBEE to copy onto ST via a USB stick, the Ethernet on my NetusBEE doesn't work any more otherwise you can simply copy files directly to the ST via a browser interface from your PC, I assume it would also work on a MAC as there's no software on the PC/MAC, just uses whatever browser you use. The software is on the ST.

Not got a 65XE, but just tried on my 800 fitted with Incognito and it also works fine there

Tested the .XEX on Altirra and my 130XE with U1M and it works fine on both. Loaded from command line and the SDIE3 loader