Sunday with my SuperBoard II

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stm
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Joined: Mon Oct 27, 2014 10:23 pm
Location: Germany

Re: Sunday with my SuperBoard II

Post by stm » Mon Sep 26, 2016 7:29 pm

BillO wrote:The device operating the DD line must be open collector or open drain. The DD, when used with the 32K RAM board is pulled high by a resistor on the 600 board so you cannot use a device with an active pull-up.
So if I want to drive the 5V DD line with a Raspberry Pi 3.3V GPIO output, I would have to implement the open collector circuit with an extra transistor and pull-up resistor, is that correct?
C1P Model 600 CPU 1978 REV B, 40K (8K original and 32K BillO memory expansion), RS-232
Maintainer of cc65 OSI target

BillO
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Re: Sunday with my SuperBoard II

Post by BillO » Tue Sep 27, 2016 12:48 pm

There is a pull-up already on the 600 board, you should not need another. But yes, it would be easiest to take the GPIO of the RPi trough a 2n3904 transistor or small mosfet, like a 2n7000. If you wanted to get deeper into the RPi, there may be a way to turn off the active pull-up on it's GPIO lines. They may then also be 5V tolerant. I'm not sure about that but this capability exists in most microcontrollers like AVRs and PICs.
Box stock Superboard II Rev. B
KLyball replica 600D, replica 610 & KLyball Data Separator
OMS SBME and SBME+ memory cards
KLyball memory card

waltermixxx
Posts: 118
Joined: Sun Feb 03, 2019 10:31 pm

Re: Sunday with my SuperBoard II

Post by waltermixxx » Fri Feb 22, 2019 6:04 pm

happy to report, i have just upgraded my OSI Superboard II (In a fancy home made case) to 40191 bytes of ram :)
I used one of BillO's 32K ram boards generously provided to me by Steve Gray. I remebered to solder the link for +5 volts
and upon pressing the Break Key, then C, then Enter on memory, It ran it's initial test, and reported I had 40191 Bytes of free ram. :)
Excellent!!

Thanks to BillO and to Steve. :)
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Cheers.
Turning into quite an OSI Junkie (HTFDTH?) Superboard II REV B-40K, 9600b, HC-05 Bluetooth, Superboard II Rev D, C4P rebuild- 502, 542c, 540B. :)

Steve Gray
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Re: Sunday with my SuperBoard II

Post by Steve Gray » Fri Feb 22, 2019 7:19 pm

Awesome! Good thing I ordered two back in 2015! ;-)

Steve
C4P working, C1P working. 600D Replica working, C4P+D&N floppy not working. 505 board, 610 board, Mittendorf board, TOSIE hacker board need testing, PicoDOS disk untested.

waltermixxx
Posts: 118
Joined: Sun Feb 03, 2019 10:31 pm

Re: Sunday with my SuperBoard II

Post by waltermixxx » Sat Feb 23, 2019 7:31 pm

Yup Very grateful you did, and thanks again for giving me one. :)
I am having a blast with the extra ram :)

Cheers. :)

I had to trim the legs down pretty short to have it fit on the board and not inter fear with the case.

thanks again :)
Turning into quite an OSI Junkie (HTFDTH?) Superboard II REV B-40K, 9600b, HC-05 Bluetooth, Superboard II Rev D, C4P rebuild- 502, 542c, 540B. :)

BillO
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Re: Sunday with my SuperBoard II

Post by BillO » Sun Feb 24, 2019 12:56 pm

Cool!
Box stock Superboard II Rev. B
KLyball replica 600D, replica 610 & KLyball Data Separator
OMS SBME and SBME+ memory cards
KLyball memory card

Steve Gray
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Re: Sunday with my SuperBoard II

Post by Steve Gray » Sun Feb 24, 2019 3:11 pm

BillO wrote:
Sun Feb 24, 2019 12:56 pm
Cool!
Hi BillO,

Thanks for designing the board. Do you have any more plans for this board? Will you make more? I was hoping to try your board with my 505 board. That would eliminate the need for the OSI 527 board. How hard would it be to make a 64K skinny dip version to get 48K ram?

Steve
C4P working, C1P working. 600D Replica working, C4P+D&N floppy not working. 505 board, 610 board, Mittendorf board, TOSIE hacker board need testing, PicoDOS disk untested.

BillO
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Re: Sunday with my SuperBoard II

Post by BillO » Wed Mar 27, 2019 5:39 pm

Hi Steve,

Sorry for the late reply.

I'm not planning any modifications to these boards and I'm out of the small ones with only 2 of the RAM/ROM boards left. I may order more as I'm sending another board out for manufacture soon.

I was thinking of designing a back-plane to go on the 600 board. Maybe 4 slots on it. I could look at putting another 8K chip on there as an option - if it still leaves enough room for sufficient I/O :mrgreen: .
Box stock Superboard II Rev. B
KLyball replica 600D, replica 610 & KLyball Data Separator
OMS SBME and SBME+ memory cards
KLyball memory card

Steve Gray
Posts: 283
Joined: Mon Oct 06, 2008 1:54 pm
Location: Markham, Ontario, Canada
Contact:

Re: Sunday with my SuperBoard II

Post by Steve Gray » Wed Mar 27, 2019 11:41 pm

BillO wrote:
Wed Mar 27, 2019 5:39 pm
Hi Steve,

Sorry for the late reply.

I'm not planning any modifications to these boards and I'm out of the small ones with only 2 of the RAM/ROM boards left. I may order more as I'm sending another board out for manufacture soon.

I was thinking of designing a back-plane to go on the 600 board. Maybe 4 slots on it. I could look at putting another 8K chip on there as an option - if it still leaves enough room for sufficient I/O :mrgreen: .
I ordered some of the same pal chips and i was hoping to learn how to program them. I’ve been wanting to learn programmable logic for years... I have some 64k skinny dip ram so maybe I’ll try making my own ram expansion with your code as a start.

Steve
C4P working, C1P working. 600D Replica working, C4P+D&N floppy not working. 505 board, 610 board, Mittendorf board, TOSIE hacker board need testing, PicoDOS disk untested.

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