10th Jul 2020, 11:05 pm | #381 |
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Re: Recreating the Bywood Scrumpi
Thank you TimB, and many thanks to Phil for making it all possible.
I must insist on compensating Phil for his costs though! I was thinking of applying my PMOS SC/MP to a NIBL system. Trouble is, it would need at least 2k of RAM, and that was a lot of contemporary parts (think: 16 off 2102). A Scrumpi would be a more appropriate use for my chip methinks. |
11th Jul 2020, 8:37 am | #382 |
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Re: Recreating the Bywood Scrumpi
karen the costs are low
take this as a contribution to the work you've done with the PIC14. with which I'm having a lot of fun I'm finishing version 2 with the keyboard and the box. Scrumpi opens up a lot of possibilities, but that was Miller's goal, as your PIC14 a wonderful pedagogical tool. we will need your knowledge to redo scrumpi 3. |
11th Jul 2020, 12:05 pm | #383 |
Octode
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Re: Recreating the Bywood Scrumpi
I knew he would say that - Karen PM me your address and I will forward it on ASAP there will be one on the way to Slothie as well.
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11th Jul 2020, 12:42 pm | #384 |
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Re: Recreating the Bywood Scrumpi
I really wish I could get a good look at a SCRUMPI 3 - I don't think they have one at the computing museum and I'm not even sure how many were made. We may have to make some fairly creative guesses as to the design of the video section....
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11th Jul 2020, 1:47 pm | #385 |
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Re: Recreating the Bywood Scrumpi
Remove post - accidental repost
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11th Jul 2020, 1:49 pm | #386 | |
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Re: Recreating the Bywood Scrumpi
Quote:
Yes the description in the article which I have extracted in one of the posts above is a good starting point though. I may start a new thread for this so we can keep this one on SCRUMPI 1 |
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11th Jul 2020, 2:33 pm | #387 | |
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Re: Recreating the Bywood Scrumpi
Quote:
PM on its way, TimB. |
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11th Jul 2020, 3:20 pm | #388 |
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Re: Recreating the Bywood Scrumpi
for scrumpi2 the EPROM is an MM5204Q
see |
11th Jul 2020, 5:01 pm | #389 |
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Re: Recreating the Bywood Scrumpi
Useful PDF - I have a few of them ready for the SCRUMPI - as to programming them I found an article in Kilobaud magazine:
https://archive.org/details/Kilobaud197709 Looks like an interesting project to convert to SC/MP perhaps from 6502 - could then be plugged into the SCRUMPI eventually. |
11th Jul 2020, 6:34 pm | #390 |
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Re: Recreating the Bywood Scrumpi
tim
the transformer part number is HM4690-D |
14th Jul 2020, 8:40 pm | #391 |
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Re: Recreating the Bywood Scrumpi
Hello
last update of the pcb as close to the original as possible in transparent epoxy and tinning. small mike schematic for its power supply with the OC28 transistor an error has been found !!! |
14th Jul 2020, 8:46 pm | #392 |
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Re: Recreating the Bywood Scrumpi
Ah excellent I wondered how he used the OC28 - funny enough, I actually have one of those here in my box of old bits...
Is this PCB now the larger size 5 x6 1/2 inches? |
14th Jul 2020, 8:59 pm | #393 |
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Re: Recreating the Bywood Scrumpi
yes identical dimension, identical schematics, almost identical serigraphy, all identical remains the manufacture which normally should be transparent epoxy with tinning. I tried to respect at most the place of each component.
for the box I plan to make a 3d box with a plexy cover and a 15 pin plug underneath for a loading extension with an arduino. I'm also writing a small programming notebook for the scrumpi. TIM if you want to complete it in english it's better. |
14th Jul 2020, 9:07 pm | #394 |
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Re: Recreating the Bywood Scrumpi
I will translate and provide as a bilingual document! Very nice.
Here is the programming and interfacing sheets from the BYWOOD manual remastered with DEMO-1 in a spreadsheet to save typing. |
14th Jul 2020, 9:11 pm | #395 |
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Re: Recreating the Bywood Scrumpi
attention tim the MIKE schematic to an error
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14th Jul 2020, 9:12 pm | #396 |
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Re: Recreating the Bywood Scrumpi
:cla p:
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14th Jul 2020, 9:18 pm | #397 |
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Re: Recreating the Bywood Scrumpi
Nice one on the OC28 stuff - I just have to build that now as I will be able to use my SCRUMPI in my Caravan from a 12v supply...
I also did Page 5 as well with the VDU and keyboard demo... and for completeness Phil has already had drafts but here is the Assemble Pages 1 and 2. |
17th Jul 2020, 12:39 pm | #398 |
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Re: Recreating the Bywood Scrumpi
Got my SCRUMPI pcb2 from tim/phil thanks! Looks great and the support for SC/MP 2 is very neat. Whilst admiring it, a thought occurred to me - with ENIN now having a pad, it would be ready to connect a microcontroller to NENIN and the address and data lines and program it to directly address the memory to loaf save the memory from/to the microcontroller flash memory to allow a certain amount of persistance without having the complexity of emulating the swich interface. It would also be fairly inconspicuous too.
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17th Jul 2020, 2:52 pm | #399 |
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Re: Recreating the Bywood Scrumpi
My PCB has arrived too. Many Thanks to all involved.
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17th Jul 2020, 5:14 pm | #400 |
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Re: Recreating the Bywood Scrumpi
Excellent news they got there safe - there are now five times as many known owners of a SCRUMPI1 than there were earlier this year!
On the DMA using NENIN - excellent idea - probably easy to pick up Write line as well on the switch CS8 or its route to RAM as well. I think I will keep going down my Diode boot board route for a serial receive and use SIO from a TTL USB UART with my PCB2 version - that can power it and program it hopefully. The NENIN route sounds ideal for the original PMOS version which needs a bulky PSU anyway. |