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Added the unary + operator, and cleaned up the display of values from the expression parser

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Jeff 2017-03-21 12:47:43 -07:00 • committed by Jeff Parsons
commit 127ddb88b4
7 changed files with 1006 additions and 817 deletions
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9
_posts/2017-02-28-learning-the-pdp-10.md
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@ -5,14 +5,15 @@ date: 2017-02-28 22:00:00
permalink: /blog/2017/02/28/
---
Since I've more or less achieved all my goals for the PCjs [PDP-11 Emulator](/devices/pdp11/machine/), I've decided
to turn my attention to an even older historically important DEC computer: the [PDP-10](https://en.wikipedia.org/wiki/PDP-10#Cancellation_and_influence).
Since I've more or less achieved all my goals for the PCjs [PDP-11 Emulator](/devices/pdp11/machine/),
I've decided to turn my attention to an even older historically important DEC computer:
the [PDP-10](https://en.wikipedia.org/wiki/PDP-10#Cancellation_and_influence).
Having never used a real DEC PDP-10, I've had a steep learning curve creating a [PDP-10 Emulator](/modules/pdp10/).
So far, the only [PDP-10 Hardware Documentation](/pubs/dec/pdp10/) I've read (or rather, skimmed) is the
[PDP-10 System Reference Manual (1968)](http://archive.pcjs.org/pubs/dec/pdp10/ka10/DEC-10-HGAA-D_PDP-10_System_Reference_Manual_May1968.pdf).
To make it easier to create and run some simple [PDP-10 Opcode Tests](/apps/pdp10/tests/), most of my initial development
To make it easier to create and run some simple [PDP-10 Opcode Tests](/apps/pdp10/tests/opcodes/), most of my initial development
efforts have centered on the built-in PDP-10 Debugger. In addition to the usual disassembler capabilities, I've also included
an assembler, so that I can easily enter instruction sequences like this:
@ -34,7 +35,7 @@ and immediately see the corresponding opcodes:
It's not a full-featured assembler; it's little more than a brute-force reverse look-up through the disassembler's
opcode-to-mnemonic tables. But it gets the job done.
Next, I've written an initial set of [PDP-10 Opcode Tests](/apps/pdp10/tests/) and compared the results to those produced
Next, I've written an initial set of [PDP-10 Opcode Tests](/apps/pdp10/tests/opcodes/) and compared the results to those produced
by [SIMH](https://github.com/simh/simh), and so far, so good. More than anything else, that's just a testament to DEC's
excellent documentation.