Source code for 805x line-by-line assembler?

I'm not really familiar with the DS5000, but ISTR that it simply does what I do in external hardware, i.e. map the lower RAM into code space and the upper RAM in to data space. Because it's still the RAM, it's still writeable. I know they have some security related operations they do to protect the memory form external view, but as I've said before, it's not rocket science. It involves a hardware trick because they can't simply make it inherent in the processor, because they then sacrifice the compatibility with other 805x types. The 89C420 is quite different from most of the 805x types, first in that a single-cycle instruction takes only one system clock cycle ( which can be 1x, 2x, or 4x the oscillator frequency up to a maximum of 50 MHz) and there modes it can operate in that greatly accelerate external memory accesses, again, up to the 50 MHz limit. I find this part quite irresistable, first because of its speed, but, more importantly, because of the high quality of the no-cost tools supporting it at least generically. This particular part has two data pointers, like several of the Dallas 805x extensions, and it has two serial ports, one of which is capable of supporting a multi-drop network interface. It has control bits that emable it automatically to increment/decrement one or both of the data pointers as part of an indirect read or write, and it has those interesting external memory interface modes, plus built-in cycle stretching logic, for increasing speed and compatibility with slower devices than the fast bus would otherwise support. Additionally, it has 16KB of on-board FLASH memory, though that's limited to 33 MHz system clock when if you use it, and it has an extra 1K of SRAM on board that can be used either in code space or in data space. Frankly, the feature set is staggering. As all of the 805x family members, it has separate code and data space, each 64KB in size, but because you can twiddle the internal ROM size parameters, you can actually have an 80KB code memory space, witht the 16KB of on-board FLASH memory enabled or disabled, selectively, or mapped where it can be used, say, as moveable tables. It's amazing! It's so flexible, I'm looking for a filesystem to use with it so it can be its own independent development tool, at least for in-the-field patching. Dick ----- Original Message ----- From: "Douglas Quebbeman" <dhquebbeman(a)theestopinalgroup.com> To: <classiccmp(a)classiccmp.org> Sent: Monday, March 25, 2002 8:34 AM Subject: RE: Source code for 805x line-by-line assembler? memory, write