Search found 241 matches

by AlanD
Sun Feb 04, 2018 9:03 am
Forum: hardware
Topic: R65C02 in a Beeb
Replies: 51
Views: 2873

Re: R65C02 in a Beeb

Hello Dave
I had to fit a 74ALS245 to get my beeb to work with a 65C02

AlanD
by AlanD
Mon May 16, 2016 12:31 pm
Forum: emulators
Topic: Bare Metal Emulator
Replies: 11
Views: 2232

Re: Bare Metal Emulator

Hi take a look here http://translate.google.com/translate?hl=de&langpair=de|en&u=http://mikrocontroller.bplaced.net/wordpress zx spectrum emu running bare metal on a 168 MHz ARM, the development environment coocox is free and the st micro discovery board http://uk.farnell.com/stmicroelectronics/stm3...
by AlanD
Fri Apr 15, 2016 6:16 am
Forum: hardware
Topic: Pictures of my ELK IDE disk interface
Replies: 50
Views: 10394

Re: Pictures of my ELK IDE disk interface

hello John

just had a quick look sorry can't find it,
try asking Prime i passed all the info schematics ,ROM etc on to Phil a few years ago

AlanD
by AlanD
Fri Oct 16, 2015 8:32 am
Forum: hardware
Topic: MGC Not Working in a Master
Replies: 7
Views: 1252

Re: MGC Not Working in a Master

Hello Dave You need to clean !npfc i suspect you need to use 16MHz - !RST - phase02 - A15 to regenerate the 1 MHz enable using the standard sr flip flop de glitching schematic which is posted in many app notes with any use of !pfc or !pfd if you don't do this you can get all sorts of random reads an...
by AlanD
Wed Aug 26, 2015 1:57 pm
Forum: acorn atom and system
Topic: Purpose of L1
Replies: 3
Views: 618

Re: Purpose of L1

Hi Phil

L1&C3 are a lowpass filter in the 5 volt supply for the video output stage.

AlanD
by AlanD
Thu Jul 30, 2015 7:45 am
Forum: hardware
Topic: Electron FPGA
Replies: 87
Views: 9851

Re: Electron FPGA

Hello Dave the timer int happens at the end of line 100 frame end int happens at the end of line 256 on a real elk the frame rate is 50.08 Hz a good test of these is to read the time variable and see if it counting at the correct rate the ULA never generates an NMI it is an input to the ULA it force...
by AlanD
Wed Nov 12, 2014 3:13 pm
Forum: past events & exhibitions
Topic: Acorn & BBC User Group (ABug) NORTH 22 Nov HALIFAX
Replies: 147
Views: 25695

Re: BBC Micro & Acorn User Group NORTH, 22 Nov HALIFAX

Hello All

Sadly i am going to have to bail out of this one so if anyone wants my place then its up for grabs


AlanD
by AlanD
Sat Sep 27, 2014 1:16 pm
Forum: past events & exhibitions
Topic: Acorn & BBC User Group (ABug) NORTH 22 Nov HALIFAX
Replies: 147
Views: 25695

Re: BBC Micro & Acorn User Group NORTH, 22 Nov HALIFAX

Hello Sydney

I will arrive Friday early evening so count me in for the curry
I have to leave Saturday evening


Aland
by AlanD
Sat Sep 27, 2014 11:41 am
Forum: past events & exhibitions
Topic: Acorn & BBC User Group (ABug) NORTH 22 Nov HALIFAX
Replies: 147
Views: 25695

Re: BBC Micro & Acorn User Group NORTH, 22 Nov HALIFAX

Hello all

Count me in I have booked my room

ATB

Aland
by AlanD
Mon Aug 11, 2014 4:25 pm
Forum: past events & exhibitions
Topic: Acorn Mini-Hackfest 2014 / Halifax / 15-16 Aug
Replies: 93
Views: 13119

Re: Acorn Mini-Hackfest 2014 / Halifax / 15-16 Aug

Hello all

I am booked in to the hotel see you Friday


AlanD
by AlanD
Sun Aug 10, 2014 6:59 pm
Forum: past events & exhibitions
Topic: Acorn Mini-Hackfest 2014 / Halifax / 15-16 Aug
Replies: 93
Views: 13119

Re: Acorn Mini-Hackfest 2014 / Halifax / 15-16 Aug

Hello all

Are there any places left if so I would like to attend

Aland
by AlanD
Wed Jul 09, 2014 2:35 pm
Forum: acorn atom and system
Topic: ATOM FPGA
Replies: 446
Views: 51495

Re: ATOM FPGA

Hello Dave

This has really moved on from when i last had time do some essential Acorn research.
Now i have finished moving house and have settled in i will have to look at bringing my FPGA Atom up to date.

AlanD
by AlanD
Wed Jul 09, 2014 2:28 pm
Forum: acorn atom and system
Topic: Internet-Connected Atom Experiment
Replies: 36
Views: 3115

Re: Internet-Connected Atom Experiment

Hello Dave

Soon the whole Interweb will be powered by FPGA Atoms =D> =D>

AlanD
by AlanD
Wed Mar 19, 2014 7:01 pm
Forum: past events & exhibitions
Topic: Wakefield Acorn Show / 26 April 2014 / W. Yorks
Replies: 187
Views: 22052

Re: Wakefield 2014

Hello All

I am booked in friday night aswell will be in bar friday night i guess

AlanD

Image
by AlanD
Mon Feb 10, 2014 8:33 pm
Forum: past events & exhibitions
Topic: Wakefield Acorn Show / 26 April 2014 / W. Yorks
Replies: 187
Views: 22052

Re: Wakefield 2014

Hello All

i will be attending wakefeild :D

AlanD
by AlanD
Sat Dec 07, 2013 11:26 am
Forum: acorn atom and system
Topic: Atom GODIL VGA Adapter
Replies: 414
Views: 38481

Re: Atom GODIL VGA Adapter

Hi Guys

Fantastic progress =D> =D>

AlanD
by AlanD
Wed Nov 20, 2013 10:08 pm
Forum: acorn atom and system
Topic: ATOM FPGA
Replies: 446
Views: 51495

Re: ATOM FPGA

Hello Charlie,Dave For the SRAM i used as6c4016 its cheap and available from farnell Also for the olimex boards don't forget the mods the most important one is pins 43 and 44 on the ram chip (2 address lines) i bent these two pins in to the air and linked them to 0V ,this frees up two fpga io (xa16 ...
by AlanD
Thu Nov 07, 2013 7:25 pm
Forum: acorn atom and system
Topic: Mk 4 Atom colour video board progress.
Replies: 71
Views: 7498

Re: Mk 4 Atom colour video board progress.

Hi Phil

i wonder if your power supply issue is common mode noise problem

maybe can be cured with a common mode choke

http://en.wikipedia.org/wiki/Choke_%28electronics%29

Aland
by AlanD
Tue Oct 29, 2013 8:36 pm
Forum: off-topic
Topic: History of storage display
Replies: 12
Views: 1402

Re: History of storage display

Slighty more up to data

http://en.wikipedia.org/wiki/Qubit

AlanD
by AlanD
Tue Oct 29, 2013 8:15 pm
Forum: off-topic
Topic: History of storage display
Replies: 12
Views: 1402

Re: History of storage display

by AlanD
Sun Oct 27, 2013 1:57 pm
Forum: acorn atom and system
Topic: Atom Colour Board Thread
Replies: 236
Views: 34941

Re: Atom Colour Board Thread

Hello Dave

Nice job =D> =D>

AlanD
by AlanD
Sun Oct 27, 2013 11:40 am
Forum: acorn atom and system
Topic: ATOM FPGA
Replies: 446
Views: 51495

Re: ATOM FPGA

Hello Dave

excellent news i will build it into mine when i get a chance



AlanD
by AlanD
Sat Oct 26, 2013 4:02 pm
Forum: acorn atom and system
Topic: ATOM FPGA
Replies: 446
Views: 51495

Re: ATOM FPGA

Hello Dave

No i was not aware of this

when i get some spare time i will try to have a look at this

hopefully it should not be to difficult to find ,the address calculation at the beginning of each line is most likley the issue

Aland
by AlanD
Thu Oct 24, 2013 6:30 pm
Forum: acorn atom and system
Topic: ATOM FPGA
Replies: 446
Views: 51495

Re: ATOM FPGA

Hello Dave

i think there is enough unused resource in the gate array for a SID

Did anyone on STH connect a SID to a real Atom??

AlanD
by AlanD
Thu Oct 24, 2013 5:32 pm
Forum: acorn atom and system
Topic: ATOM FPGA
Replies: 446
Views: 51495

Re: ATOM FPGA

Hello Dave

just thought have you realised that if you plug headphones in to the olimex board that the atom sound works also :D :D :D

AlanD
by AlanD
Thu Oct 24, 2013 4:58 pm
Forum: acorn atom and system
Topic: ATOM FPGA
Replies: 446
Views: 51495

Re: ATOM FPGA

Hello Dave good to hear the board arrived ok and you seem to have quickly got up to speed with it seems like you and Kees have ironed out a whole raft of bugs with SDDOS =D> =D> =D> =D> sounds like we have a very high compatability ratio with a real Atom from what you say about the software you have...
by AlanD
Mon Oct 21, 2013 9:35 pm
Forum: acorn atom and system
Topic: ATOM FPGA
Replies: 446
Views: 51495

Re: ATOM FPGA

Hello Dave board is modified sram fitted and in a box + sd card adapter fitted (conf. memory has an older version of atom fpga programmed in) power jack socket is 5v centre pin pin positive i have also enclosed a lead to help with jtag programming the orignal atom fpga package i uploaded has the cor...
by AlanD
Mon Oct 21, 2013 9:09 pm
Forum: acorn atom and system
Topic: ATOM FPGA
Replies: 446
Views: 51495

Re: ATOM FPGA

Hello Dave i am surprised at your build time my PC (i5 laptop win7 64bit 6GB ram) does a build all of the atom project in 2-3 minutes i am using xilinx ise 12.2 i wonder why there is such a difference @Kees SDDOS is so much better now thanks for the fixes AlanD edit Dave i posted the olimex board th...
by AlanD
Sun Oct 20, 2013 7:34 pm
Forum: acorn atom and system
Topic: ATOM FPGA
Replies: 446
Views: 51495

Re: ATOM FPGA

Hello Dave i have just had a look at the mods i made to the olimex board the most important one is pins 43 and 44 on the ram chip (2 address lines) i bent these two pins in to the air and linked them to 0V ,this frees up two fpga io (xa16 & xa17) that it is relatively easy to link to. i linked ps2 d...
by AlanD
Sun Oct 20, 2013 7:03 pm
Forum: acorn atom and system
Topic: ATOM FPGA
Replies: 446
Views: 51495

Re: ATOM FPGA

Hello Dave

i will post the olimex board tomorrow (monday)

excellent job with the software archive look forward to you posting it

@Kees thanks for updating sddos

AlanD