Finish fixing html files in 2004

There is one thing brought up on GitHub that might necessitate a minor
change but that can happen later.
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Cody Boone Ferguson committed 2024-08-15 10:15:32 -07:00
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@@ -57,26 +57,32 @@ represented by one symbol that are either defined or undefined.
The ALU has six instructions:
- `CLR_X` - Clear [register](https://en.wikipedia.org/wiki/Processor_register) `X`.
- `CLR_X`
* Clear [register](https://en.wikipedia.org/wiki/Processor_register) `X`.
- `CLR_Y` - Clear [register](https://en.wikipedia.org/wiki/Processor_register) `Y`.
- `CLR_Y`
* Clear [register](https://en.wikipedia.org/wiki/Processor_register) `Y`.
- `ADD` - Calculates `X` + `Y` and stores the result in `X`. If the result
is larger than 11 bits, the [CARRY
bit](https://en.wikipedia.org/wiki/Carry_flag) in `SR` is set otherwise
the `CARRY` bit is cleared.
- `ADD`
* Calculates `X` + `Y` and stores the result in `X`. If the result
is larger than 11 bits, the [CARRY
bit](https://en.wikipedia.org/wiki/Carry_flag) in `SR` is set otherwise
the `CARRY` bit is cleared.
- `SUB` - Calculates `X` - `Y` and stores the result in `X`. If `Y` was larger
than `X`, the [CARRY bit](https://en.wikipedia.org/wiki/Carry_flag)
in `SR` is set otherwise the `CARRY` bit is cleared.
- `SUB`
* Calculates `X` - `Y` and stores the result in `X`. If `Y` was larger than
`X`, the [CARRY bit](https://en.wikipedia.org/wiki/Carry_flag) in `SR` is
set otherwise the `CARRY` bit is cleared.
- `TST` - If `X` == `Y` the `EQ` bit in `SR` is set, otherwise the `EQ` bit is
cleared. If `X` < `Y` the `LT` bit in `SR` is set, otherwise the `LT`
bit is cleared.
- `TST`
* If `X` == `Y` the `EQ` bit in `SR` is set, otherwise the `EQ` bit is
cleared. If `X` < `Y` the `LT` bit in `SR` is set, otherwise the `LT` bit is
cleared.
- `INC2` - Calculates `X` + 2 and stores the result in `X`. The [CARRY
bit](https://en.wikipedia.org/wiki/Carry_flag) is handled as in the
`ADD` instruction.
- `INC2`
* Calculates `X` + 2 and stores the result in `X`. The [CARRY
bit](https://en.wikipedia.org/wiki/Carry_flag) is handled as in the `ADD`
instruction.
Internally the [ALU](https://en.wikipedia.org/wiki/Arithmetic_logic_unit)
implements a one bit adder with a carry in and carry out. This adder is the core
@@ -108,10 +114,10 @@ The choice of application may be a bit unfortunate since we've already
seen a winning entry calculating [prime
numbers](https://en.wikipedia.org/wiki/Prime_number) in the
[pre-processor](https://en.wikipedia.org/wiki/C_preprocessor).
There is a big difference though. The [1988/applin](../../1988/applin/index.html) entry uses pre-
processor arithmetic (in a very nice way though). This program only
defines and undefines symbols in a well defined ;) way and doesn't do
any pre-processor arithmetics.
There is a big difference though. The
[1988/applin](../../1988/applin/index.html) entry uses pre-processor arithmetic
(in a very nice way though). This program only defines and undefines symbols in
a well defined ;) way and doesn't do any pre-processor arithmetics.
The reason why I chose to do a [prime
number](https://en.wikipedia.org/wiki/Prime_number) application is that the