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NB Clock

Written by Chris Despoinidis

Friday, 29 April 2016

_System Clock_

by Gerald McMullon

The COP provides a system clock after

each interrupt (50 times per second).

The COP scans the keyboard and looks

after the relays for the cassette motor

as well as handling the VF display.

Page zero stores 4 bytes, the current

status of the clock in location 52H-55H

(82-85 decimal).

The clock can be displayed by the

following:

FOR i=1TO1000 :

PUT 12 :

?PEEK(82),PEEK(83),PEEK(84),PEEK(85) :

NEXT i

The most significant byte is PEEK(85).

The true value can be found by

?PEEK(85) + 256*( PEEK(84)+256*(

PEEK(83) + 256*PEEK(82) ) )

and can be reset by

FOR i=82to85 : POKE i,0 : NEXT i

On the unexpanded NewBrain or simple

expansion (disk controller) the

following call locations are available:-

CALL 62383 :REM to reset the clock

CALL 62399, ms : REM to obtain the

system clock time

The value in seconds is calculated by

ms/50.

Example:

5 REM Waste 10 seconds

(approximately)

10 CALL 62383

20 CALL 62399,ms :

IF ms < 500 THEN 20

30 END

The clock is very accurate, and has

matched a quartz watch, to within a

minute for over 24 hours.

To time a piece of code, reset at the

begining and read at the end of the

code.

E.g.

CALL 62383

CALL 62399,no :REM time calls

CALL 62383

... : REM your code

CALL 62399,ms :

?"Took";(ms-no)/50;"secs"

NB note the system clock is normally

considered to be the routines at 62383

and 62399.

0 Comments

General Comments for the Emulator

Written by Chris Despoinidis

Friday, 30 October 2015

----------------------------------------------------

Newbrain emulator

Programmed by Despinidis Chris

----------------------------------------------------

This emulator uses the raize z80 emulator.

The disassembly part in the debug screen is from the

pasmulator z80 emulator with very seceral modifications by me.

At first i used the pasmulator for emulating the z80 but

it was not a 100% z80 emulator so i switched to raize.

The newbrain emulator was first programmed in Delphi version 5.0

using the following third party components:

Delphi X

Jedi code library

VGLib version 1

Hit more to get more info for these topics:

Starting

--------

Loading And Saving

------------------

Importing Files

----------------

Designing Characters

--------------------

Led Screen

----------

Changing Speed

--------------

Keyboard

--------

Hit more to get more info for these topics

0 Comments

Last Updated Friday, 30 October 2015

More Most Wanted ..

Contributed by Colin Appleby

Saturday, 30 November 2013

Danish Newbrain User Group Magazines NB!03, NB!04, NB!05 for 1983 and the Danish "Brains" NewBrain Magazines for 1987 if they exist.

Mastermon program as sold in Denmark.

Information on LEASCO Pharmacutical Roms and User Manual for NewBrain.

Information on the Norway NewBrain User Group and need copies of their NewBrain User Group Magazines.

Any help would be greatly appriciated.

Regards

0 Comments

UK Pound Sign for NewBrain Emulator ..

Contributed by Colin Appleby

Sunday, 20 October 2013

If you are using a US Keyboard as I am on your Computer, when running the NewBrain Emulator press the Shift and * key for the UK Pound sign. The * key is on the KeyPad only.

0 Comments

Extending NewBrain Basic commands

Contributed by Colin Appleby

Wednesday, 14 August 2013

Has anyone wrote an assembly language program to extend the Newbrain Basic commands as suggeated in "The Newbrain Dissected" book by John Braga (Page 72). Address A2F9h Point to Keyword Table.

Similar to Simon's Basic program and cartridge for the Commodore 64 which extends the Basic v2 by 114 commands and the Simon's Basic Extension by another 91 Commands.

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Saphir17: For the diy-hard NB fanboys... Check Ebay for : GRUNDY NEWBRAIN RETRO COMPUTER MUG (Date: 25/02/2022 16:41)

gillespienewbrain: Hi, Can anyone tell me what commands I need to load a program from PC to NB over serial using PC2NB or the emulator? (Date: 08/08/2019 17:13)

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