sup8pdct

no. It was a box that sat on top replacing the lid. No one has said any thing about it so am assuming it is rare.

James

I do recall in an early antic, an add for some storage soulation (i think) replaced the whole top. what and how is unknown. any one remember it?

james

Bump again.
Any news?

James

Is ok to ask. The 6502 is a processor that requires everything to be in a single address space ie somewhere between location 0 and 65535 or $0 and $FFFF in hex.
The os ROM starts at $C000, continues to $CFFF, $D000 to $D7FF is hardware chip area which is always available. $D800 to $FFFF is also rom.
The MMU when instructed will switch access from the rom to ram that mirrors the same address space hence the term behind. Note that 2K of ram will never be accessed due to hardware chip area.

James

Super products (8 bit stuff only) which I now own Did a 64K upgrade for the 800. It was a piggy back board that plugged into the rom board. It has 2 8k static ram chips, a 32K eprom for 2 versions of revB roms plus supermon and several LS chips to handle logic and emulating A single line on PIA chip. It worked well except for programs that expected XL roms.
The 2 versions of rom was normal and one slightly modded in the PIA init routine so extra ram wasn't selected. It came with 2 switches, Xl emulation on/off, supermon on/off.
I once modded an XL rom to add in the extra 4 paddles, extra 2 joysticks and modded the reset routine to work for 800 hardware. Sent one to Mike of FTE. never heard a thing since.
Superram a Axalon compatiable ramdisk (also piggyback) was also made for the middle ram slot and it included a single wire to be soldered to the rom board. With a switch (4way) and the the xl emulator board and some more work with soldering iron, the 800 could emulate an XE without the separate antic switching. Not bad for mid to late 80's stuff.

James