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?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.
Sunday with my SuperBoard II
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Re: Sunday with my SuperBoard II
C1P Model 600 CPU 1978 REV B, 40K (8K original and 32K BillO memory expansion), RS-232
Maintainer of cc65 OSI target and llvm-mos-sdk C1P target
Maintainer of cc65 OSI target and llvm-mos-sdk C1P target
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Re: Sunday with my SuperBoard II
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
OMS Digi-Mule expansion bus
KLyball memory card
KLyball replica 600D, replica 610 & KLyball Data Separator
OMS SBME and SBME+ memory cards
OMS Digi-Mule expansion bus
KLyball memory card
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Re: Sunday with my SuperBoard II
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.
Cheers.
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.
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.
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Re: Sunday with my SuperBoard II
Awesome! Good thing I ordered two back in 2015!
Steve
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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Re: Sunday with my SuperBoard II
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
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.
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Re: Sunday with my SuperBoard II
Cool!
Box stock Superboard II Rev. B
KLyball replica 600D, replica 610 & KLyball Data Separator
OMS SBME and SBME+ memory cards
OMS Digi-Mule expansion bus
KLyball memory card
KLyball replica 600D, replica 610 & KLyball Data Separator
OMS SBME and SBME+ memory cards
OMS Digi-Mule expansion bus
KLyball memory card
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- Joined: Mon Oct 06, 2008 1:54 pm
- Location: Markham, Ontario, Canada
- Contact:
Re: Sunday with my SuperBoard II
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.
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Re: Sunday with my SuperBoard II
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 .
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 .
Box stock Superboard II Rev. B
KLyball replica 600D, replica 610 & KLyball Data Separator
OMS SBME and SBME+ memory cards
OMS Digi-Mule expansion bus
KLyball memory card
KLyball replica 600D, replica 610 & KLyball Data Separator
OMS SBME and SBME+ memory cards
OMS Digi-Mule expansion bus
KLyball memory card
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- Posts: 325
- Joined: Mon Oct 06, 2008 1:54 pm
- Location: Markham, Ontario, Canada
- Contact:
Re: Sunday with my SuperBoard II
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.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 .
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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- Joined: Tue Jul 08, 2014 4:03 pm
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Re: Sunday with my SuperBoard II
Hey Steve,
I finally got around to making more boards - now in luscious RED!!
I'll post pictures tomorrow in case you are interested.
How did your own effort go?
I finally got around to making more boards - now in luscious RED!!
I'll post pictures tomorrow in case you are interested.
How did your own effort go?
Box stock Superboard II Rev. B
KLyball replica 600D, replica 610 & KLyball Data Separator
OMS SBME and SBME+ memory cards
OMS Digi-Mule expansion bus
KLyball memory card
KLyball replica 600D, replica 610 & KLyball Data Separator
OMS SBME and SBME+ memory cards
OMS Digi-Mule expansion bus
KLyball memory card