Virtualc64: Add support for new CIAs

[dirkwhoffmann]

Currently, only the old CIAs are emulated.

[puleyo]

Thank you, the new CIA are the best

[Alessandro1970]

..but the two CIA 6526a or 6526 are quite identical...

_The difference seems to be that new CIA chip triggers interrupts 1 cycle before the old one does (it has nothing to do with reaching 0 vs. underflowing). The old CIA triggers at the cycle after the underflow,
and the new CIA triggers at the cycle of the underflow. The interrupt is delayed by one cycle._

cia6526.zip

[dirkwhoffmann]

Current progress (Lorenz test suite):

Update: CIA2TA also fails in VICE. I found the following in the README file:

IMPORTANT: imr, cia2ta, cia2tb have NOT been (fully) updated yet and currently fail on "new" CIAs

[dirkwhoffmann]

A new popup button "Hardware Configuration" has been added. It can be used to select one out of six hardware models (C64 PAL old, C64 PAL, C64 II PAL, C64 NTSC old, C64 NTSC, C64 II NTSC). All sub components (VIC, CIA, SID etc.) are then adjusted automatically to match the selected model.

[dirkwhoffmann]

V3.0 beta 1 can be downloaded from the website. The most critical issues (multi-threading performance issue, missing public key for the Sparkle updater) are fixed.

[dirkwhoffmann]

The "Hardware Configuration" popup button had a short life-time. I've replaced it with an enhanced "Restore Factory Settings" button which lets the user choose the C64 model to emulate. Seems much simpler and more reasonable to me.

Furthermore, a "Emulate Timer B bug" checkbox has been added. It allows to alter the behavior of the old NMOS CIAs.

[dirkwhoffmann]

The new hardware panel can be tested with V3.0 beta 2

[dirkwhoffmann]

New CIAs seem to work well now. Please reopen if you find any issues.