assembler , disassembler for AM2900
i want to get disassembler for Am29xx series 4 slicebit processor.
please tell me where i find this Tools.
That is a really old bit slice processor and is no longer being made.
Something I have to relay to you about bit slice processors vs.
standard off the shelf (pre-made) processors. A bit slice processor
is a very basic processor (a sub component of a CPU) where you put one
or more of them in a bus line, and connect carry lines and other logic
to these processors to make it into a general purpose CPU. All a bit
slice is, is a section of a processor, I have seen ALUs and straight
Integer based bit slices. Basically you use a bunch of different bit
slice processors together to make a CPU aka central processing unit.
So in order to understand what a bit slice processor is doing by itself
or in conjunctions with other logic devices, you need to look at it from
an electronics standpoint as well, running through the truth tables in
logic (learn boolean algebra, it is your best friend for programming and
reducing the amount of logic required to get what you want for an end
Trying to get a disassembler for for a 2900 or 2904 bit slice is darn
near impossible, they didn't have those back then. Everyone was using
hardware monitors with register & return switches, and other primative
Here is something that will bake your noodle.
In order to get an assembler or disassembler for a processor
it must first have microcode embedded in the core of the processor.
CPUs and DSPs have microcode
Bit slice processors do not have microcode
Therefore you can't disassemble the programming the normal way.
The primative way of doing what microcoding does for the instruction
registers (and execution units do) is figure out the logic that
your bit slice processor is using currently. The way in which
bit slices operated until it got a clocking, buffering, and execution
unit with a reference ROM (microcode) to look into and execute internal
logic, was to hardcode logic gates to do certain tasks. Believe me,
this is quite annoying when you are first learning how to do this.
To better understand what I am refering to, look for the old AMD
29xxx product guides online, they have sample circuits, and the
logic tables (discreet logic or PALs you need to burn or build)
in order to get a working Central Processing Unit that can use
a really small ROM to load microcode from.
I hope you're an electronic / electrical engineer, otherwise
you are going to run into some serious trouble trying to comprehend
processor bit slice architecture and what you need to be able
to make a processor out of it, then write an assembly / disassembler
monitor for the new processor you have created out of the bit
slice (Building Blocks for a CPU).
I know this probably is confusing you.
The bit slices are nothing more than building blocks for a real CPU.
Building blocks don't use assembler and disassemblers, it is
all based on logic gates and other discreet devices at that level.
What you need to do is make a virtual processor out of the bit slices
with gates, registers, and other glue logic (the stuff that makes the
whole thing work together), like a timing chip with buffer, etc.). It
complex from here on out.
Now, instead of trying to do something like that with an AM2900 or
AM2904, try using an in circuit simulator you can get for the PC
to make virtual processors, and build the CPU out of blocks on there,
run simulations, and if you find a version of a processor you like and
think it will do well, have it burn a PGA or PIC processor for you with
the layout you describe and logic tables you have designed. This saves
your sanity, trust me! Plus that program is a lot faster than you, it
can take years out of development time, can check for logic problems /
errors, and simplify the circuits to get a faster processor.
That idea is a Win-Win situation.
The only disassemblers and assemblers that were available for the
AMD 29xxx series processors were the math co-processors, the AMD 29000
series not to get confused with the bit slice 2900 or 2904 or the rare
2908 (8-bit, bit slice processor).
: Hi all
: i want to get disassembler for Am29xx series 4 slicebit processor.
: please tell me where i find this Tools.
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