tune-it / bcomp

bcomp (Basic Computer)

This is simple computer model studied in ITMO University since 1982 by first year students. Its features are simple instructions set (inspired from PDP-8 and PDP-11), simple microprogram model and logic scheme to easy learn basics of computer architecture.

All documentation is unfortunativelly in Russian. You can look at https://se.ifmo.ru/courses/csbasics for details. There is also lectures track on https://www.youtube.com/playlist?list=PLBWafxh1dFuwbs2bc_ba_1FIm4SzFYg2p

There are two branches for old model v1 (this model was studied until year 2019) and next generation model v2 (current). Folder "docs" is for old model and would be deleted in the future for v2.

bcomp's Issues

Добавьте ВУ-10 "Пульт от ядерки"

Чтобы можно было в любой момент по указанию практика прервать выполнение "полезной программы" и обработать должным образом

In assembler BVS command is absent, while BVC is present

For code:

BVS SUCK
LD #0x1

In Nightmare Mode, there is only Russian language available

The English and Russian languages seem to work normally when I launch BComp in "normal" mode using -Duser.language key, like this:
$ java -jar -Duser.language=en bcomp-ng.jar
However, the language setting seems to have no impact on Nightmare mode (-Dmode=nightmare). Say, when I launch BComp with the following command:
$ java -jar -Duser.language=en -Dmode=nightmare bcomp-ng.jar
the hotkey labels are still displayed in Russian.

This occurs at least on my Linux operating system, but may happen on other platforms as well.
I understand that this issue does not impact the working process of BComp, but still ask you to review this.

Direct load with hexademical written as decimal results in NPE

Sadly, BCOMP-NG does not properly handle STDOUT redirection, so here is manual Copy-paste from system console log.txt of event caused by
following code:

ORG 0x1C
START: LOOP START
       LD   #FF

Similar issue occurs with following code:

ORG FF
START: LOOP START

But with a different error message: log2.txt

In all of these events nothing is #printed in BCOMP log window.

Weirdly, when only ORG FF is present in the program without any functional code assembler compilation error is correctly printed into BCOMP log window and no JVM errors are noticed

ВУ-0 (Таймер) генерирует одно прерывание многократно

После гененрирования первого прерывания ВУ-0 продолжает генерировает его многократно, по выходу из первого прерывания.

Способ репликации:

        ORG     0x0
V0:     WORD    $INT0, 0x180

        ORG     0x40
START:  DI
        CLA
        LD      #0x8    ;ENABLES INTERRUPT ON TIMER
        OUT     0x1
        LD      #0xA    ;SETS THE INTERRUPT TIME TO 1 SECOND
        OUT     0x0
        CLA
        EI

LP:     ADD #0x1
        JUMP LP

INT0:   
        NOP
        IRET

Однако, если перед выходом из прерывания записывать в DR значение, то прерывание больше не генерируется:

; То же что и в прошлом примере

INT0:   
        NOP
        LD     #0xA
        OUT      0x0
        IRET