[ATARI] Altirra 2.0 test XLV

Altirra 2.0.0 test 45 - 18 10 2011

Bugs Fixed:

• Disk: DSKINV hook now supports writes to sectors bigger than 128 bytes.

Author' comment:

Test-43 contains a fix for an STIMER regression in POKEY; I only discovered it doing PCM audio, but there may be some other digisound code that was affected. This version also has some fixes for double and quad density disk issues:

Altirra 2.0.0 test 44 - 18 10 2011

• ????????

Altirra 2.0.0 test 43 - 16 10 2011

• For a while now, I've been thinking about ways to do PCM audio on the 8-bit Atari better than the standard 4-bit PCM through volume-only mode. The way this used to be done with the PC speaker was through one-shot mode, which unfortunately POKEY lacks. I tried doing this with two-tone mode but wasn't able to get more than about 4.5-bit precision due to only being able to use the second half of each period. I realized last night that 16-bit linked timers could be used to create a one-shot timer by using the high timer to hold down the low timer after it has fired. The result is the attached music - Les+Barricades+Mysterieuses.zip. 

Altirra 2.0.0 test 42 - 13 10 2011

Features added:

• Debugger: Improved output of .pia command.
• Debugger: Call, loop, and interrupt collapsing in history window can now be toggled.
• Debugger: History window can now show timestamps in cycles, unhalted cycles, and microseconds from an anchor point.
• Debugger: Extended memory syntax now allows access to hidden RAM (r: prefix).
• Debugger: Added .tape and .tapedata commands.

Bugs Fixed:

• Debugger: Fixed crash when attempting to load empty file as symbol file.
• Debugger: Source path matching now allows partial path matches both ways and has improved behavior with duplicate filenames in different directories.
• Debugger: Fixed wrapping of frame counter in history window.
• Cassette: Fixed data blocks being silently dropped when reading some .cas files.
• Cassette: Fixed inaccuracy in data rate produced from loading .cas files.

Altirra 2.0.0 test 41 - 29 09 2011

Features added:

• MMU: Added 320K and 576K Compy Shop configurations.

Bugs Fixed:

• Debugger: _ and. are now accepted as part of symbol names in expressions.

Altirra 2.0.0 test 40 - 23 09 2011

Features added:

• Cartridge: Added support for newer MaxFlash 1MB cartridges that power up in bank 0 instead of bank 127.
• Cartridge: Added support for 1M Megacart (different type with similar name).

Altirra 2.0.0 test 39 - 23 09 2011

Author' comment:

Oops... regression in 16-bit timer handling. This version also allows finer grained speed adjustments by 1%. I forgot to add this to the change log. I also have some fixes pending for display issues with the Windows 8 Developer Preview, but I doubt anyone's hitting those at the moment.

Altirra 2.0.0 test XXXVII 13 09 2011

Author' comment:

OSS 8K and ROM path shuffling should be fixed. The OSS 8K mode is the same as the OSS M091 mode except that an 8K ROM is used instead of a 16K ROM. One difference between it and regular 8K is that the OSS 8K cart can be disabled whereas the standard 8K can't.
I hooked up the BASIC cart to the BASIC option for pre-800XL machines because it's such a commonly needed cartridge. I should change it to a different option now that the option's been renamed, but I'm not going to do it until after post 2.0.

Altirra 2.0.0 test XXXVII 12 09 2011

breaking changes

• Debugger: The step over command has been changed from s to o.

Features added:

• Debugger: Added fill (f) and search (s) commands.
• Debugger: Register (r) command can now set individual flags.
• Cartridge: Added support for OSS 8K, Blizzard 4K, AST 32K, Atrax SDX 64K, Turbosoft 64K, and Turbosoft 128K types.

Bugs Fixed:

• Debugger: Register (r) can no longer clear bits 4 and 5 of P when unsupported by current CPU mode.

Author' comment:

I missed the comment about the ROM image issue -- it's a bug in the code that saves it. I messed up the array order. I'll fix it on the next revision.

AFAIK there is no standard name for the XEGS kernel ROM image. What you should have for it is a 16K image; the BASIC and Missile Command (game) ROM images should be separate. I've heard rumors that the XL/XE and XEGS operating systems are actually the same and it's just that the XEGS support was added in a later revision.