OK... Can you folks tell me what kind of 65816 that you want? Kind of a survey.
Let me tell you what I have working:
65816 with selectable clock speeds - 1.79mhz, 7.16mhz, and 14.32mhz. Some programs fail at high speeds because of cycle-counting, I believe. So, you can set whatever speed you want. It will survive RESET.
512K of linear memory. Addresses from $000000 to $07FFFF are available at full speed using the 65816 linear addressing mode.
Almost finished:
256K of RAMBO memory utilizing bits 2,3,5, and 6. 128K of XE mode memory using bits 2,3,and 6. Selectable. Separate from and concurrent with the linear memory, but runs at 7.16mhz. Battery backed 512K chip. The remaining 256K will hold system code (OS, PBI code, 8K internal cartridge, and such) Will survive power-down.
Will add:
SDHC interface for mass storage using PBI protocol.
Features:
A drop-in. No wiring to the motherboard or chips. I am currently using the 800XL PCB in a 1200XL, in which case you have to remove the audio modulator coil from the 1200XL motherboard. You can either de-solder the coil or just clip it out. 10 minute reversible install if you have sockets.
So... You can have a 512K 65816 today. Or, you can wait for the extended memory tomorrow. Or, you can hold out for the MAX system somewhere down the road.
Or, you can suggest needed additions to make this more useful. I'm adding what I would want - but I'm just one guy.
No:
XEs
6502.
Video stuff.
More SRAM memory, DRAM or the like.
I refer to this project as the XL14. It has run in an 800XL, a 600XL(!), and a 1200XL. The 600XL and 800XL have serious space problems, but they do work. How much? I dunno... $100? How about a Dutch auction for 10 units?
Let me know...
Bob
![DSC01124.JPG]()
Let me tell you what I have working:
65816 with selectable clock speeds - 1.79mhz, 7.16mhz, and 14.32mhz. Some programs fail at high speeds because of cycle-counting, I believe. So, you can set whatever speed you want. It will survive RESET.
512K of linear memory. Addresses from $000000 to $07FFFF are available at full speed using the 65816 linear addressing mode.
Almost finished:
256K of RAMBO memory utilizing bits 2,3,5, and 6. 128K of XE mode memory using bits 2,3,and 6. Selectable. Separate from and concurrent with the linear memory, but runs at 7.16mhz. Battery backed 512K chip. The remaining 256K will hold system code (OS, PBI code, 8K internal cartridge, and such) Will survive power-down.
Will add:
SDHC interface for mass storage using PBI protocol.
Features:
A drop-in. No wiring to the motherboard or chips. I am currently using the 800XL PCB in a 1200XL, in which case you have to remove the audio modulator coil from the 1200XL motherboard. You can either de-solder the coil or just clip it out. 10 minute reversible install if you have sockets.
So... You can have a 512K 65816 today. Or, you can wait for the extended memory tomorrow. Or, you can hold out for the MAX system somewhere down the road.
Or, you can suggest needed additions to make this more useful. I'm adding what I would want - but I'm just one guy.
No:
XEs
6502.
Video stuff.
More SRAM memory, DRAM or the like.
I refer to this project as the XL14. It has run in an 800XL, a 600XL(!), and a 1200XL. The 600XL and 800XL have serious space problems, but they do work. How much? I dunno... $100? How about a Dutch auction for 10 units?
Let me know...
Bob
