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Vintage Computers Any vintage computer systems, calculators, video games etc., but with an emphasis on 1980s and earlier equipment.

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Old 17th May 2020, 10:51 am   #161
Timbucus
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Default Re: Recreating the Bywood Scrumpi

Why is it when you look at something you notice it is wrong - the board is wired correctly I just drew it wrong - here is the detail of my use of the three position switch: I.e. the Center (R/W and Pullup) connects to neither (in the middle) one side to GND (when pushed DOWN in reality) and one side to NWDS.
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Old 17th May 2020, 11:01 am   #162
Timbucus
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Default Re: Recreating the Bywood Scrumpi

Quote:
Originally Posted by philoupat83 View Post
Hello
I’m happy for you.
you have modifications on the inital schemat made a plan to check and send me the
Hopefully the above helps - one thing I did notice when I was routing the Flags and Serial is that the Serial is the wrong end on the LED's - I think maybe a trace must go under the CPU behind F1 and F2 and under the link from F0 to present it that end... You had not got that far on the last one you showed. I am getting this layout from the Box picture at SunMoonStars and its labels. He labels it as SENSE which did not make sense (no pun intended). As SENSE A is interrupt I wondered if he showed the status of the SA switch there? Can't see how to route it though looking quickly as it would have to cross the data bus - so I am sure he just labelled it wrong.
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Old 17th May 2020, 2:08 pm   #163
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Default Re: Recreating the Bywood Scrumpi

send me a too vague not clear schema and the switch enable has changed?
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Old 17th May 2020, 2:12 pm   #164
Timbucus
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Default Re: Recreating the Bywood Scrumpi

No the wiring on the original is correct that is just ME on my veroboard - just use the one from the original DJD article so that PROTECT and LOAD switches are as original - that design is unique to my Prototype
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Old 17th May 2020, 2:14 pm   #165
Timbucus
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Default Re: Recreating the Bywood Scrumpi

On the circuit above the Pin numbers hand written in RED are the ones for the PCB - the black ones are the ones I used so ignore.
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Old 17th May 2020, 2:42 pm   #166
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Default Re: Recreating the Bywood Scrumpi

You are correct it is messy - here is what I think is the final labelled diagram for the PCB version with the correct Pin numbers
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Old 18th May 2020, 12:13 pm   #167
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Default Re: Recreating the Bywood Scrumpi

Hello
to finalize our restoration it would be necessary to write a notice of use can you take care of it
the pcb is being completed
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Old 18th May 2020, 6:16 pm   #168
Timbucus
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Default Re: Recreating the Bywood Scrumpi

I had been thinking I would write a manual and short technical history - I will see what I can do!
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Old 19th May 2020, 7:19 pm   #169
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Default Re: Recreating the Bywood Scrumpi

I presume in your diagram the top end of R3 is connected to pin 5 of the 555 (CHARGE)
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Old 19th May 2020, 8:44 pm   #170
Timbucus
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Default Re: Recreating the Bywood Scrumpi

No it is connected to pin 4 and 8 as in the label. Pin 5 CTRL has a small capacitor to Ground although that seems to be absent on the schematic from DJD or indeed on the board. I have put one on mine.

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Old 19th May 2020, 9:30 pm   #171
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Default Re: Recreating the Bywood Scrumpi

Ah sorry I didn't read the label as being associated with the resistor.
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Old 20th May 2020, 11:31 am   #172
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Default Re: Recreating the Bywood Scrumpi

a picture of the pcb still some modification
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Old 20th May 2020, 7:01 pm   #173
Timbucus
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Default Re: Recreating the Bywood Scrumpi

Looking really good - perhaps a little cramped above IC5 to put the links across? The real board has more room as IC2 is in line with the switches so IC1 can move over a little bit. I assume you have yet to add the Data Bus holes in line with the address ones (as I can see the ones around the IO chips are also yet to be added).

You will have finished this soon.

I am doing well on a support document but, I wish I could fix the memory write problem... my 2112 chips are still "stuck in transit" according to FedEx...
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Old 20th May 2020, 10:13 pm   #174
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Default Re: Recreating the Bywood Scrumpi

Hello I correct it is a long work all by hand without highway keeping the spirit pcb artisanal of the time rounded tracks brief that of the cosmetique
I also have to replay the pcb on kicad because the text is not in the right direction see SCRUMPI upside down and the switch text
good I must also thicken the tracks more work to do
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Old 20th May 2020, 10:19 pm   #175
Timbucus
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Default Re: Recreating the Bywood Scrumpi

Yes I am in awe of the work you are putting in to draw this PCB as so authentic - it is a massive amount of work on your part and really appreciated that you want such attention to detail.

Hopefully we can make a good manual and programming guide to go with it once I get my memory working. Here is a draft of the booklet see what you think.

TheSoulOfAnOldMachineDRAFTv0.pdf
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Old 20th May 2020, 10:51 pm   #176
Timbucus
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Default Re: Recreating the Bywood Scrumpi

I think maybe this would make a nicer Page9

SOAOMv1-Page9.pdf
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Old 21st May 2020, 8:57 am   #177
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Default Re: Recreating the Bywood Scrumpi

hello thank you for it is compliment your document is very very good nevertheless be more impersonal a forum is a sharing of other read our discussions and interested in our creation
soon in a second part we will attack the scrumpi 2
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Old 21st May 2020, 9:02 am   #178
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Default Re: Recreating the Bywood Scrumpi

more work
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Old 21st May 2020, 9:18 am   #179
philoupat83
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Default Re: Recreating the Bywood Scrumpi

really great this document
verified the list R4 R5 reversed see photo 74c04 or 74c07?
I received the memory AM9112 I wait for the switches and led with resistance included
may be that this virus ..... had served to bring men closer together
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Old 21st May 2020, 10:12 am   #180
SiriusHardware
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Default Re: Recreating the Bywood Scrumpi

It has certainly given many people more time to spend on interesting projects like this.

Tim, very nice draft document but I have barely been involved in this thread so you can probably remove me from the 'credits'. This is definitely your and Phil's 'baby', with useful contributions from Slothie. All I've done is grumble about how primitive the system is.

Looking forward to seeing the finished article though.

Last edited by SiriusHardware; 21st May 2020 at 10:38 am. Reason: Spelling Mitsake
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