Search found 66 matches

by John Ferguson
Fri Apr 20, 2018 3:27 pm
Forum: acorn atom
Topic: Connecting a printer to the Atom
Replies: 15
Views: 374

Re: Connecting a printer to the Atom

Hi Phill

Looking at the data sheet for the ls244 buffer chip to be piggy backed on the ic50 I will connect pin 9 of the 6522 via chip to pin 17 of the buffer with pin 3 of the buffer connected to the printer connector where bit 7 should have been.

I hope this is okay.

John
by John Ferguson
Thu Apr 19, 2018 4:48 pm
Forum: acorn atom
Topic: Connecting a printer to the Atom
Replies: 15
Views: 374

Re: Connecting a printer to the Atom

Hi Phill

I understand about piggy backing the ic50 but not the connections you describe to follow.

I need pin connections then to follow. Buffer inputs and outputs mean little to me.

Thanks for your help.

John
by John Ferguson
Thu Apr 19, 2018 6:53 am
Forum: acorn atom
Topic: Connecting a printer to the Atom
Replies: 15
Views: 374

Re: Connecting a printer to the Atom

Hi Phill

How would you provide the connections to get bit 7 by piggybacking the ic50?

It sound a very interesting idea.

John
by John Ferguson
Sun Apr 15, 2018 9:12 pm
Forum: acorn atom
Topic: Connecting a printer to the Atom
Replies: 15
Views: 374

Re: Connecting a printer to the Atom

Hi Kees Looking at your diagram of the connections I see that 26 way connectors are required. I have done some research and found for sale a bbc micro parallel printer cable 26 way idc to centronics 36 way printer cable. This should fit a right angle 26 way idc pcb connector for the Atom as recommen...
by John Ferguson
Sun Apr 15, 2018 6:32 pm
Forum: acorn atom
Topic: Connecting a printer to the Atom
Replies: 15
Views: 374

Re: Connecting a printer to the Atom

Thank you about installing ic1 and 50. I have these on order. Then I see from the technical manual I need a 26 way pcb connector but I can’t find any printer cables as they all require 36 ways. The manual talks about a ribbon cable connector but does not explain how this would work with a printer. H...
by John Ferguson
Sun Apr 15, 2018 4:02 pm
Forum: acorn atom
Topic: Connecting a printer to the Atom
Replies: 15
Views: 374

Connecting a printer to the Atom

Is there a solution to connecting a modern printer to the Atom?

Has anyone solved this problem.

I would be interested to hear.

John
by John Ferguson
Mon Apr 09, 2018 7:00 am
Forum: for sale / freebies
Topic: Something for sale on Ebay
Replies: 3
Views: 369

Re: Something for sale on Ebay

Sorry for not knowing this. It won’t happen again.

John
by John Ferguson
Sun Apr 08, 2018 12:22 pm
Forum: for sale / freebies
Topic: Something for sale on Ebay
Replies: 3
Views: 369

Something for sale on Ebay

I have just put something on ebay
John

edited by admin
by John Ferguson
Wed Apr 04, 2018 4:30 pm
Forum: acorn atom
Topic: Micro Power Ltd Rom board
Replies: 24
Views: 486

Re: Micro Power Ltd Rom board

Thank you Dave
by John Ferguson
Wed Apr 04, 2018 12:59 pm
Forum: acorn atom
Topic: Micro Power Ltd Rom board
Replies: 24
Views: 486

Re: Micro Power Ltd Rom board

Hi Dave

Will it be possible for you to list the commands so that the rom is usable?

John
by John Ferguson
Wed Apr 04, 2018 9:06 am
Forum: acorn atom
Topic: Micro Power Ltd Rom board
Replies: 24
Views: 486

Re: Micro Power Ltd Rom board

Hi Dave Here is the link yet again. I hope this is right. https://www.dropbox.com/s/udl8hhl7etakfnt/Rom%201%20final.wav?dl=0 I checked the rom address and that the hex list was correct so hopefully you now have the toolbox rom. I tried the machine code monitor rom as your list of commands and all se...
by John Ferguson
Tue Apr 03, 2018 6:18 pm
Forum: acorn atom
Topic: Micro Power Ltd Rom board
Replies: 24
Views: 486

Re: Micro Power Ltd Rom board

Sorry about this I will try again.

I need to pay more attention.

John
by John Ferguson
Tue Apr 03, 2018 4:31 pm
Forum: acorn atom
Topic: Micro Power Ltd Rom board
Replies: 24
Views: 486

Re: Micro Power Ltd Rom board

Hi Dave

Here is the link for rom 1 which is a toolbox.

https://www.dropbox.com/s/n0eeqgmbzfgz9 ... n.wav?dl=0

I hope this right.

John
by John Ferguson
Tue Apr 03, 2018 4:00 pm
Forum: acorn atom
Topic: Micro Power Ltd Rom board
Replies: 24
Views: 486

Re: Micro Power Ltd Rom board

The hex number was different for ?#9000=0

So I selected ?#9d000=1 This Rom is called a toolbox.

And now saving rom and loading to Dropbox.

THanks for the copy for AtomMMC.

John
by John Ferguson
Tue Apr 03, 2018 10:50 am
Forum: acorn atom
Topic: Micro Power Ltd Rom board
Replies: 24
Views: 486

Re: Micro Power Ltd Rom board

Hi Dave Here are the dropbox links to the 2 rom files saved from the atom. https://www.dropbox.com/s/1w5320cz1iq4do8/Rom%200.wav?dl=0 https://www.dropbox.com/s/8osm8lxie3yqu0s/Rom1.wav?dl=0 The huge range of Atom files are interesting. So many of them. Are they in the correct format to work with my ...
by John Ferguson
Mon Apr 02, 2018 8:06 pm
Forum: acorn atom
Topic: Micro Power Ltd Rom board
Replies: 24
Views: 486

Re: Micro Power Ltd Rom board

Hi Dave The Rom board is installed in a different Atom to the one with AtomMMC. I will load the rom areas to my laptop as you suggest using the cable I made up. How do I transfer them to the software archive? Would it be possible to use and fit the AtomMMC Rom in one of the spare Rom sockets? Thanks...
by John Ferguson
Mon Apr 02, 2018 5:45 pm
Forum: acorn atom
Topic: Micro Power Ltd Rom board
Replies: 24
Views: 486

Re: Micro Power Ltd Rom board

Hi Dave

Here is the photo of the results.

John

20180402_183623_resized_1.jpg
Results of the Rom programme
by John Ferguson
Mon Apr 02, 2018 4:09 pm
Forum: acorn atom
Topic: Micro Power Ltd Rom board
Replies: 24
Views: 486

Re: Micro Power Ltd Rom board

Many thanks for the response. I will get back to you shortly.

John
by John Ferguson
Mon Apr 02, 2018 2:53 pm
Forum: acorn atom
Topic: Micro Power Ltd Rom board
Replies: 24
Views: 486

Re: Micro Power Ltd Rom board

Hi Dave The rom board is wired to IC27 using pins 3,5,7,9,11,&13. The 3 ic's on the rom board are:- Reading from left to right. 74LS20PC SN74LS75N SN74LS139N The left hand rom is M/C Monitor and the next one is called Toolbox. It would be brilliant if you could get this solved. John 20180402_153...
by John Ferguson
Mon Apr 02, 2018 11:50 am
Forum: acorn atom
Topic: Micro Power Ltd Rom board
Replies: 24
Views: 486

Micro Power Ltd Rom board

Here is the Rom board by Micro Power with 2 rom's.

Does any one know how to select each rom?

John

20180328_185058_resized_2.jpg
Micro Power Rom board
by John Ferguson
Fri Mar 30, 2018 9:07 pm
Forum: acorn atom
Topic: Programmers toolbox rom
Replies: 8
Views: 204

Programmers toolbox rom

Does anyone have a list of the commands for this utility please.

I have the Rom and know how to launch it with link #AFC0 but then I can not take advantage of the built in facilities.

John
by John Ferguson
Tue Mar 27, 2018 1:39 pm
Forum: acorn atom
Topic: Acorn Atom newly acquired not resetting
Replies: 19
Views: 626

Re: Acorn Atom newly acquired not resetting

Thanks for the comments about the use of WD40. This Atom had been stored in very damp conditions and corrosion had started to some degree. WD40 seemed suitable to me for the following reasons as stated on the can. It drives out moisture, cleans and protects, loosens rusted parts, and frees sticky me...
by John Ferguson
Mon Mar 26, 2018 5:12 pm
Forum: acorn atom
Topic: Micro Power Rom Board
Replies: 0
Views: 159

Micro Power Rom Board

I have acquired a Rom board for the Atom with 2 toolbox chips fitted out of 4 possible in total.

Does anyone have the manual for this device that shows how to use each of the roms fitted?

The manufacturer was a Micro Pwer Ltd.

John
by John Ferguson
Mon Mar 26, 2018 3:44 pm
Forum: acorn atom
Topic: Acorn Atom newly acquired not resetting
Replies: 19
Views: 626

Re: Acorn Atom newly acquired not resetting

Hi Kees

I have just sprayed the Atom with WD40 and so far the Atom does not lock up.

It may have cured the problem. It was your idea to use contact cleaner that helped me

Now for memory testing. I can see faults in the graphic modes.

John
by John Ferguson
Mon Mar 26, 2018 12:55 pm
Forum: acorn atom
Topic: Acorn Atom newly acquired not resetting
Replies: 19
Views: 626

Re: Acorn Atom newly acquired not resetting

Hi Kees What is odd about the locking up is that the Atom behaves normally upside down but not in the normal position. I have tried pressing every chip into their socket. I take your point about cleaning the legs but I wonder whether you know which chips to look at. Also while I can clean the legs h...
by John Ferguson
Mon Mar 26, 2018 11:50 am
Forum: acorn atom
Topic: Acorn Atom newly acquired not resetting
Replies: 19
Views: 626

Re: Acorn Atom newly acquired not resetting

Hi Kees Thank you for the programme to help gain access to the roms. The colour board is connected to PL4 and the output is connected to the negative end of the C2 capacitor via a switch. C2 is no longer directly connected to the negative pad on the Atom board. The switch when operated joins the ori...
by John Ferguson
Sun Mar 25, 2018 6:44 pm
Forum: acorn atom
Topic: Acorn Atom newly acquired not resetting
Replies: 19
Views: 626

Re: Acorn Atom newly acquired not resetting

What is interesting now the Atom is working is that the Atom prompt appears instantly when powering up the computer. The random display no longer appears and the break key is not needed. The capacitor c11 was not installed for the break key circuit. I am wondering also whether link 5 shown on the ci...
by John Ferguson
Sat Mar 24, 2018 4:00 pm
Forum: acorn atom
Topic: Acorn Atom newly acquired not resetting
Replies: 19
Views: 626

Re: Acorn Atom newly acquired not resetting

This afternoon the Atom started to work amazingly so my guess is that various chips need to be pressed home. Loose fitting devices as suggested must have been the problem. No doubt I accidentally disturbed them. Break key as normal. The Atom has a switch to select colour or black and white. Changing...
by John Ferguson
Fri Mar 23, 2018 4:23 pm
Forum: acorn atom
Topic: Acorn Atom newly acquired not resetting
Replies: 19
Views: 626

Re: Acorn Atom newly acquired not resetting

This is my Atom with the colour and rom boards

John

Atom with colour board revised.jpg
by John Ferguson
Fri Mar 23, 2018 8:10 am
Forum: acorn atom
Topic: Acorn Atom newly acquired not resetting
Replies: 19
Views: 626

Re: Acorn Atom newly acquired not resetting

Hi Paul, Kees, and Graeme

I will try all you have said. Many thanks for the responses.

I will post a photo of the board later today.

John