My Master is back from the dead

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fordp
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My Master is back from the dead

Postby fordp » Fri Feb 03, 2017 6:54 pm

My master died in the last few days, but now it has a shiny new mainboard from ebay.

The date codes on the chips show it to be middle '90s.

IMG_20170203_184456.jpg


The boards were formally used in some medical equipment. The Roms including the Mos one are custom. The only down side is the back plate has been sheared off at the end on the pcb.

I can get back to Raspberry Pi Copro hacking now :D
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sweh
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Re: My Master is back from the dead

Postby sweh » Fri Feb 03, 2017 7:02 pm

What is "Tinsley 64K" ? I don't think I've ever seen that before!

Might be worth imaging the MOS ROM if it's unique :-)
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fordp
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Re: My Master is back from the dead

Postby fordp » Fri Feb 03, 2017 7:43 pm

Well it is modified as Basic does not start by itself.

I expect I will image it before reprogramming it with a stock version.

I am guessing it is a 64K Byte EPROM are all Mos chips 64K on a Master?
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danielj
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Re: My Master is back from the dead

Postby danielj » Fri Feb 03, 2017 7:45 pm

It's a non standard 128k jobby!

http://mdfs.net/Info/Comp/BBC/SROMs/MegaROM.htm

d.

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fordp
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Re: My Master is back from the dead

Postby fordp » Fri Feb 03, 2017 7:56 pm

Thanks for the information. I am guessing this custom one is only 64KB as it only has Terminal, Basic and DFS in it.

I tried my ROM from my old Master and the board will not boot which means my old OS ROM is probably dead.

I will have to look at my options.

Edit: I just ordered a replacement from Ebay :D
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1024MAK
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Re: My Master is back from the dead

Postby 1024MAK » Fri Feb 03, 2017 10:05 pm

It's rare that mask ROM chips die, so I surprised that the old Master megaROM does not appear to work :-?

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fordp
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Re: My Master is back from the dead

Postby fordp » Fri Feb 03, 2017 10:14 pm

I checked it was seated properly in the socket and it was. The socket may be modified but I doubt that as it only has three ROMs in it and a 64KB eprom would work without modification I think.

Edit: Yes a 27C512 will work in OS the socket.
Last edited by fordp on Fri Feb 03, 2017 10:24 pm, edited 1 time in total.
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Re: My Master is back from the dead

Postby hoglet » Fri Feb 03, 2017 10:22 pm

fordp wrote:I checked it was seated properly in the socket and it was. The socket may be modified but I doubt that as it only has three ROMs in it and a 64KB eprom would work without modification I think.

Just a thought from looking at the schematic. Check LK9 - compare it to your old Master board. This may be a PCB link.

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1024MAK
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Re: My Master is back from the dead

Postby 1024MAK » Fri Feb 03, 2017 10:24 pm

Check LK9 just in case...

Mark

Edit, Dave just beat me! :lol:
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Re: My Master is back from the dead

Postby CMcDougall » Fri Feb 03, 2017 10:28 pm

1024MAK wrote:It's rare that mask ROM chips die

not rare at all, can sell you 5 for LOLPRICE :lol:

first was my DFS2.25 back in 1986, so hence bought a programmer, cheaper than a DFS2.26 \:D/
ImageImageImage

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1024MAK
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Re: My Master is back from the dead

Postby 1024MAK » Fri Feb 03, 2017 10:37 pm

CMcDougall wrote:
1024MAK wrote:It's rare that mask ROM chips die

not rare at all, can sell you 5 for LOLPRICE :lol:

first was my DFS2.25 back in 1986, so hence bought a programmer, cheaper than a DFS2.26 \:D/

Maybe they were attacked by a feisty ADFS chip that escaped from your clutches... :lol:

Mark
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Re: My Master is back from the dead

Postby hoglet » Fri Feb 03, 2017 10:40 pm

1024MAK wrote:Edit, Dave just beat me! :lol:

Got to be faster Mark, :lol:

Here's a photo of the Motherboard, and there does seem to be a link fitted in LK9, which is unusual, and it looks like it is grounding A16, which is wrong for the MOS ROM.
s-l1600.jpg


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fordp
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Re: My Master is back from the dead

Postby fordp » Fri Feb 03, 2017 10:57 pm

I said my eye sight was bad but how I missed a link right next to the socket, doh! Anyway it works with the Acorn MOS ROM from my old Master now. Thanks for your suggestions. I need to make a new battery pack tomorrow as I threw the old Alkalines out as they were leaking and crazy old.
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fordp
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Re: My Master is back from the dead

Postby fordp » Fri Feb 03, 2017 11:06 pm

I have just realised the 64K on the boot is referring to the size of the OS ROM, and not anything else. I will image all the ROMs on this board in the near future as there may be something unusual in them.
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Re: My Master is back from the dead

Postby jgharston » Fri Feb 03, 2017 11:07 pm

Image the Tinsley ROMs so they can be archived! :)

Edit: You posted saying so just as I posted. :D

Code: Select all

$ bbcbasic
PDP11 BBC BASIC IV Version 0.25
(C) Copyright J.G.Harston 1989,2005-2015
>_

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fordp
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Re: My Master is back from the dead

Postby fordp » Sat Feb 04, 2017 5:51 pm

jgharston wrote:Image the Tinsley ROMs so they can be archived! :)

Edit: You posted saying so just as I posted. :D


All done. I think the MOS is just cut down to fit in 64K. The other contents in the MOS ROMs are very late versions I think however.

The other two ROMS contain stuff for the specialist medical application that the board was put to.
Attachments
TinsleyRoms.zip
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FordP (Simon Ellwood)
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jgharston
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Re: My Master is back from the dead

Postby jgharston » Sun Feb 05, 2017 11:09 pm

Image

Code: Select all

$ bbcbasic
PDP11 BBC BASIC IV Version 0.25
(C) Copyright J.G.Harston 1989,2005-2015
>_

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Pernod
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Re: Henson CFA 3000

Postby Pernod » Fri Nov 03, 2017 3:46 pm

I've been taking a closer look at this in order to get it running and have made some progress.

Links
First of all the links LK18 and LK19 are obviously set for ROM in IC41 and IC37 respectively.

Userport
From looking at the SETUP program, which is in BASIC, it expects a keyboard on the userport. The keys are mapped as follows:
240 Pattern Right
241 Pattern Left
242 Patient Response
243 Present Stimuli
244 Down
245 Up
246 Left
247 Right
248 D
249 C
250 B
251 A
252 Mode
253 Erase
254 Restart
255 Print
The number being the value returned on the userport.

1MHz bus
There are also some startup options being read from &FCC2 so must be connected to the 1MHz bus.
- Switch 8 controls whether, in the 'Supra Threshold' program, the CFA 3000 starts off in the first level (screening) or the second level.
"OPEN-2nd level CLOSED-1st level"
- Switch 7 controls whether the CFA 3000, in its 'Supra Threshold' program, displays information in log units or decibels.
"OPEN-db CLOSED-log units"
- Switch 6 controls whether the CFA 3000 starts up in the 'Full Threshold' program or the 'Supra Threshold' program.
"OPEN-Full Threshold CLOSED Supra Threshold"
- Switch 5 controls whether, as part of the 'Full Threshold' test, the CFA 3000 estimates the patients fluctuation.
"OPEN-est. fluct. CLOSED-do not est. fluct."
- Switch 4 controls whether, as part of the 'Full Threshold' test, the CFA 3000 automatically re-tests any retinal location at which it finds the threshold to be more than 4 db below the expected value for an age matched norm.
OPEN-repeat>4 db CLOSED-do not repeat >4 db
- Switch 3 controls whether the serial transfer is 'Auto Send' or 'Request Send'.
OPEN - Auto Send CLOSED - Request Send
- Switch 2 - not used.
- Switch 1 - not used.

Analogue
It also reads from the analogue port but haven't looked at that yet.

0006.png
- Nigel

BBC Model B, ATPL Sidewise, Acorn Speech, 2xWatford Floppy Drives, AMX Mouse, Viglen case, etc.


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