EclaireXL

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MCC-216 Atari 800XL core v0.50 release note

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Mark Watson

scrameta@gmail.com

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The keyboard is mapped to match an Atari 800XL physical layout.

Special/console keys:

F5 - Help

F6 - Start

F7 - Select

F8 - Option

F9 - Reset

F10 - Cold start (clear base 64KB RAM and reset)

F11 - Select drive 1 and cold start

Use joystick to make selection in menu

Left - up several lines

Right - down several lines

Up - up 1 line

Down - down 1 line

Fire - select

Remember many titles require holding 'option'

Select "DIR .." to go up a directory

Select "DIR xxx" to go down a directory

F12 - System settings menu

Use joystick to make selection

Turbo - system speed

Left/right to select

1x (default): is very compatible - speed closely matches original hardware ~1.7MHz

2x: ~3.4MHz - less compatible

4x: ~6.8MHz - less compatible

8x/16x: 13MHz, 27MHZ - limited by SDRAM latency, not quicker than 4x yet.

RAM

Left/right to select

64KB: like 65XE

128KB: like 130XE, 64KB ext ram, switchable by antic/cpu

320KB(Compy shop)(default): 256KB ext ram, switchable by antic/cpu

320KB(Rambo): 256KB ext ram, both antic/cpu switch together

576KB(Compy shop): 512KB ext ram, switchable by antic/cpu

576KB(Rambo): 512KB ext ram, both antic/cpu switch together

1088KB: 1024KB ext ram, both antic/cpu switch together

4160KB: - very imcompatible!

ROM

Right/fire: File selector

Select a different system OS ROM - can by 16KB or 10KB

Drive

Left: Remove disk

Right: File selector

Fire: Put this disk in F1

Cartridge 8K simple

Fire: select file

This allows a ROM to be loaded in the place of BASIC

Some simple ROM cartridges can be used

This is temporary until proper cartridge support is implemented

System ROM:

Loaded from /System/rom/atari800/atarixl.rom

Basic:

Loaded from /System/rom/atari800/ataribas.rom

Disk images:

Default dir: /atari800/user

Supported types:

.ATR - Atari disk image with header. single/medium/double density.

.XFD - Atari disk image without header.

.XEX - Atari executable. A simple bootloader is loaded, not 100% compatible.

Important notes:

When running Atari software a lot of programs need to have basic disable. Hold option when pressing reset.

Features

* Acid 800 test pass

* 99% of software runs

* Version for PAL/NTSC VGA/SVIDEO

* Write support

* Drive emulation

Known issues

* ~1% of programs fail

* Keyboard layout board on UK PS2 keyboard, no remapping possible yet.

* Copymate write verify fails

* Entering menu during disk access may hang ZPU (used for drive emulation/menus)

* Sometimes keyboard input fails - need to power off/on the MCC.

* Hardware matches Atari very closely - including overscan corruption - this often shows up on VGA monitors.

Enjoy !