NC Super89 Baseboard!
norberto.collado koyado.com
All,
Completely the pcb layout of the new NC Super89 baseboard that provides the following capabilities:
NC Super89 Baseboard Features:
- Fully Heath Compatible
- 256KB Read/Write EEPROM Monitor
- 512KB of RAM with battery backup to boot HDOS 2, HDOS 3, CPM, MMS CPM3, and MPM. Supports memory Floppy drive.
- CPU speed software selectable: 2MHz, 4MHz, 8MHz, and 16MHz with indicators.
- System Clock (SC) is fixed to 2MHZ or variable 2-16MHz; jumper selectable.
- Wait states when running at 8MHz and 16MHz
- I2C Real Time Clock
- I2C OLED Display header for power-on and system messages. VCC and GND jumper selectable.
- UART’s Clocks software selectable: 1.8432MHz and 3.6864MHz to run at high speeds
- USB flash drive support by using VDIP1 controller
- H37 jumper selectable support (170Q or 270Q)
- 2x USART 16C550 on baseboard
- SPI Wiznet/SD controller to provide HDOS and CPM network support
- SPI NVRAM for network and system configuration setup
- 6 slots for I/O configuration
- Updated right slots to handle 270Q->277Q range to support H17, H37, and H67 at same time.
- USB-TTL header for both UARTS
See attached picture as a reference.
Norberto
glenn.f...@gmail.com
Amazing. If this had appeared in 1980 you would think you’d died and gone to heaven!
I presume DIP format Z80 chips are still widely available?
Will this function as a single board computer via the wall adapter? Great work.
- Glenn
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norberto.collado koyado.com
Thanks!
Will this function as a single board computer via the wall adapter? Yes it will. Also, you can put it onto a small chassis to use as a standalone system.
I presume DIP format Z80 chips are still widely available? Yes! I can find them in eBay. Let me know if I need still need to change it to a PLC44 Z80 instead…
Norby
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norberto.collado koyado.com
Website link: https://koyado.com/heathkit/New-H8-Website/nc-super89-motherboard.html
For Wall adapter, a +5V 4A power supply should be fine.
Norby
Darrell Pelan
Les Bird
norberto.collado koyado.com
Thanks Les!
Norberto
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smb...@gmail.com
norberto.collado koyado.com
Hello Scott,
Yes it is very expensive. To keep it low, I can order only 5-pcs of the board. 10-pcs will bring the price around $200+.
Here is the breakdown for 5-pcs:
Thanks,
Norberto
To view this discussion visit https://groups.google.com/d/msgid/sebhc/67021396-ec88-4828-b2f4-7dbed0eff7d4n%40googlegroups.com.
Steven Feinsmith
rw...@robhome.com
I’d love to get 2 of these, but I’m not in a hurry. I bet we see these tariffs come down in another few months.
Rob Waggoner
615-260-6903
________________________________
From: se...@googlegroups.com <se...@googlegroups.com> on behalf of Steven Feinsmith <steven.f...@gmail.com>
Sent: Saturday, May 10, 2025 7:33:41 PM
To: sebhc Google Group <se...@googlegroups.com>
From: se...@googlegroups.com <se...@googlegroups.com> on behalf of norberto.collado koyado.com <norberto...@koyado.com>
Date: Saturday, May 10, 2025 at 8:08 PM
To: se...@googlegroups.com <se...@googlegroups.com>
Subject: RE: [sebhc] Re: NC Super89 Baseboard!
Hello Scott,
Yes it is very expensive. To keep it low, I can order only 5-pcs of the board. 10-pcs will bring the price around $200+.
Here is the breakdown for 5-pcs:
2. 256KB Read/Write EEPROM Monitor
3. 512KB of RAM with battery backup to boot HDOS 2, HDOS 3, CPM, MMS CPM3, and MPM. Supports memory Floppy drive.
4. CPU speed software selectable: 2MHz, 4MHz, 8MHz, and 16MHz with indicators.
5. System Clock (SC) is fixed to 2MHZ or variable 2-16MHz; jumper selectable.
6. Wait states when running at 8MHz and 16MHz
7. I2C Real Time Clock
8. I2C OLED Display header for power-on and system messages. VCC and GND jumper selectable.
9. UART’s Clocks software selectable: 1.8432MHz and 3.6864MHz to run at high speeds
10. USB flash drive support by using VDIP1 controller
11. H37 jumper selectable support (170Q or 270Q)
12. 2x USART 16C550 on baseboard
13. SPI Wiznet/SD controller to provide HDOS and CPM network support
14. SPI NVRAM for network and system configuration setup
15. 6 slots for I/O configuration
16. Updated right slots to handle 270Q->277Q range to support H17, H37, and H67 at same time.
17. USB-TTL header for both UARTS
See attached picture as a reference.
Norberto
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norberto.collado koyado.com
Better to wait until everything gets back to normal. Hopefully soon.
Norby
From: se...@googlegroups.com <se...@googlegroups.com>
On Behalf Of rw...@robhome.com
Sent: Saturday, May 10, 2025 6:58 PM
To: sebhc Google Group <se...@googlegroups.com>
Subject: Re: [sebhc] Re: NC Super89 Baseboard!
$200 per board, or $200 for 5 boards?
I’d love to get 2 of these, but I’m not in a hurry. I bet we see these tariffs come down in another few months.
Rob Waggoner
From:
se...@googlegroups.com <se...@googlegroups.com> on behalf of Steven Feinsmith <steven.f...@gmail.com>
Sent: Saturday, May 10, 2025 7:33:41 PM
To: sebhc Google Group <se...@googlegroups.com>
Subject: Re: [sebhc] Re: NC Super89 Baseboard!
It is a fantastic product for my Heathkit H89 and H88 models. However, I am genuinely concerned about the dramatic surge in board manufacturing costs. The prices of components have skyrocketed, making them increasingly unaffordable. I hope that until there’s a shift in economic policy, perhaps with the involvement of Trump and his administration alongside Republicans and MAGA supporters, we may not see a return to more reasonable pricing.
From:
se...@googlegroups.com <se...@googlegroups.com> on behalf of norberto.collado koyado.com <norberto...@koyado.com>
Date: Saturday, May 10, 2025 at 8:08 PM
To: se...@googlegroups.com <se...@googlegroups.com>
Subject: RE: [sebhc] Re: NC Super89 Baseboard!
Hello Scott,
Yes it is very expensive. To keep it low, I can order only 5-pcs of the board. 10-pcs will bring the price around $200+.
Here is the breakdown for 5-pcs:
- Fully Heath Compatible
- 256KB Read/Write EEPROM Monitor
- 512KB of RAM with battery backup to boot HDOS 2, HDOS 3, CPM, MMS CPM3, and MPM. Supports memory Floppy drive.
- CPU speed software selectable: 2MHz, 4MHz, 8MHz, and 16MHz with indicators.
- System Clock (SC) is fixed to 2MHZ or variable 2-16MHz; jumper selectable.
- Wait states when running at 8MHz and 16MHz
- I2C Real Time Clock
- I2C OLED Display header for power-on and system messages. VCC and GND jumper selectable.
- UART’s Clocks software selectable: 1.8432MHz and 3.6864MHz to run at high speeds
- USB flash drive support by using VDIP1 controller
- H37 jumper selectable support (170Q or 270Q)
- 2x USART 16C550 on baseboard
- SPI Wiznet/SD controller to provide HDOS and CPM network support
- SPI NVRAM for network and system configuration setup
- 6 slots for I/O configuration
- Updated right slots to handle 270Q->277Q range to support H17, H37, and H67 at same time.
- USB-TTL header for both UARTS
See attached picture as a reference.
Norberto
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Steven Hirsch
> It is a fantastic product for my Heathkit H89 and H88 models. However, I am genuinely concerned about the dramatic surge in board manufacturing costs. The prices of components have skyrocketed, making them increasingly unaffordable. I hope that until there’s a shift in economic policy, perhaps with the involvement of Trump and his administration alongside Republicans and MAGA supporters, we may not see a return to more reasonable pricing.
>
fill the holes. The only problem with that is that there are precisely zero
US PCB fabs with an interest in low-value hobbyist boards - and there won't be
any, regardless of how long one waits.
Steven Hirsch
> For DIP40 Z80 you can use this which converts PLC44 to DIP40
> (https://martenelectric.cz/z80cpu_plcc44_dip40_adapter.html). I had a bunch of
> these made by JLC and ordered a bunch of PLC44 Z80 20MHZ chips from AliExpress
> (https://www.aliexpress.us/item/3256804836040322.html).
>
> It's a great alternative for the Z80 DIP if those are getting hard to find.
discontinued the DIP Z80.
norberto.collado koyado.com
Finally the new improved H89A baseboard labeled “NC Super89” is fully up and running and even the I2C OLED display with a new Splash Screen. Attached are some pictures.
It is booting, Heath HDOS 2.0, HDOS 3.0, Heath CP/M, MMS CPM3+, and MP/M as well due to its 512KB RAM capacity..
The only remaining development is the SPI bus to drive the WizNet network and 2x SD cards.
Thanks to all that helped get the board up and running. It has been truly teams work. 😊
Best Regards,
Norberto
From: norberto.collado koyado.com
Sent: Wednesday, May 7, 2025 4:15 PM
To: se...@googlegroups.com
Subject: NC Super89 Baseboard!
All,
Completely the pcb layout of the new NC Super89 baseboard that provides the following capabilities:
NC Super89 Baseboard Features:
- Fully Heath Compatible
- 256KB Read/Write EEPROM Monitor
- 512KB of RAM with battery backup to boot HDOS 2, HDOS 3, CPM, MMS CPM3, and MPM. Supports memory Floppy drive.
- CPU speed software selectable: 2MHz, 4MHz, 8MHz, and 16MHz with indicators.
- System Clock (SC) is fixed to 2MHZ or variable 2-16MHz; jumper selectable.
- Wait states when running at 8MHz and 16MHz
- DS1302 Real Time Clock
- I2C OLED Display header for power-on and system messages. VCC and GND jumper selectable.
- UART’s Clocks software selectable: 1.8432MHz and 3.6864MHz to run at high speeds
- USB flash drive support by using VDIP1 controller
- H37 jumper selectable support (170Q or 270Q)
- 2x USART 16C550 on baseboard
- SPI Wiznet/SD controller to provide HDOS and CPM network support
- SPI NVRAM for network and system configuration setup
- 6 slots for I/O configuration
- Updated right slots to handle 270Q->277Q range to support H17, H37, and H67 at same time.
- USB-TTL header for both UARTS
norberto.collado koyado.com
New baseboard working fine inside the old H89 enclosure. See attached pictures…
From: se...@googlegroups.com <se...@googlegroups.com> On Behalf Of norberto.collado koyado.com
Sent: Sunday, May 25, 2025 1:36 PM
To: se...@googlegroups.com
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Glenn Roberts
On May 25, 2025, at 8:36 PM, norberto.collado koyado.com <norberto...@koyado.com> wrote:
To view this discussion visit https://groups.google.com/d/msgid/sebhc/SA3PR01MB7918EFAFCB6C63C23F62081AF765A%40SA3PR01MB7918.prod.exchangelabs.com.
<NC Super89 baseboard inside the H89 system and working.jpg><inside old H89.jpg>
pel...@gmail.com
Absolutely AWESOME! Thanks for all your great work Norberto and the rest of the group.
Darrell
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Mike Cassidy
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Terry Smedley
Joseph Travis
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glenn.f...@gmail.com
Beautiful work, as always. Amazing that those ”sheet edge insert” connectors are still available after all these years! (https://mou.sr/3Z795LT)
From: se...@googlegroups.com <se...@googlegroups.com> On Behalf Of Terry Smedley
Sent: Friday, May 30, 2025 7:32 PM
To: SEBHC <se...@googlegroups.com>
Subject: Re: [sebhc] RE: NC Super89 Baseboard!
To support Norberto's NC Super89 Baseboard, I worked up a replica design of the H89 PCB top bracket. I suspect there won't be much demand for this, as I'd imagine that in most cases there will be an OEM bracket available from whatever PCB is being upgraded/replaced. But in case there's a need, the attached .zip contains design files in three formats: SolidWorks eDrawings (.easm), STEP, and Protocase Designer (.pda). The bracket was fabricated by Protocase (Canada). As of this moment, shipments from Canada are still tariff-free if under the $800 de-minimus valuation. As recent history has amply shown, that tariff waiver is subject to frequent and unexpected change.
The plastic mounts at each end of the bracket are Essentra SEI-1, available from the usual stocking distributors (Mouser, Digikey, etc).
Photographs show adjacent replica (bottom) and OEM brackets (top), and the replica bracket on a H89 CPU PCB ounted into the H89 cabinet. Sharp eyes will note that the photograph does not show an H89 cabinet - it's a Z19-CN with the H89 CPU board stuffed into it for a fit check.
tas
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Terry Smedley
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norberto.collado koyado.com
Terry,
I’m impressed and was not expecting such outstanding support. Great work and as good or better than the original design.
Thank you very much!
Norberto
From: se...@googlegroups.com <se...@googlegroups.com> On Behalf Of glenn.f...@gmail.com
Sent: Friday, May 30, 2025 5:35 PM
To: se...@googlegroups.com
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pel...@gmail.com
Amazing detective work!
Darrell
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Darrell Pelan
norberto.collado koyado.com
That is a beautiful bracket! 😊
From: se...@googlegroups.com <se...@googlegroups.com> on behalf of Joe Travis N6YPC <jtravi...@gmail.com>
Date: Monday, June 16, 2025 at 5:31 PM
To: SEBHC <se...@googlegroups.com>
Subject: Re: [sebhc] RE: NC Super89 Baseboard!
Special thanks to Terry Smedley and Darrell Pelan for their work on the brackets for the NC Super89!
On Saturday, May 31, 2025 at 9:50:33 AM UTC-4 Darrell Pelan wrote:
The boss on the CPU mounts doesn't make sense since the bracket needs to lay flat on the PCB. The STLs are attached.
On Saturday, May 31, 2025 at 9:15:46 AM UTC-4 Darrell Pelan wrote:
Terry,
I modified your step file to add a boss on the four top mount points in order to use brass inserts. I'm considering adding them to the PCB mounting holes so you don't need nuts. The picture is a 3D printed bracket and mounting nut.
On Friday, May 30, 2025 at 7:32:05 PM UTC-4 Terry Smedley wrote:
To support Norberto's NC Super89 Baseboard, I worked up a replica design of the H89 PCB top bracket. I suspect there won't be much demand for this, as I'd imagine that in most cases there will be an OEM bracket available from whatever PCB is being upgraded/replaced. But in case there's a need, the attached .zip contains design files in three formats: SolidWorks eDrawings (.easm), STEP, and Protocase Designer (.pda). The bracket was fabricated by Protocase (Canada). As of this moment, shipments from Canada are still tariff-free if under the $800 de-minimus valuation. As recent history has amply shown, that tariff waiver is subject to frequent and unexpected change.
The plastic mounts at each end of the bracket are Essentra SEI-1, available from the usual stocking distributors (Mouser, Digikey, etc).
Photographs show adjacent replica (bottom) and OEM brackets (top), and the replica bracket on a H89 CPU PCB ounted into the H89 cabinet. Sharp eyes will note that the photograph does not show an H89 cabinet - it's a Z19-CN with the H89 CPU board stuffed into it for a fit check.
tas
To view this discussion visit https://groups.google.com/d/msgid/sebhc/be502e1a-fdd3-402d-9d0c-3e65000e342an%40googlegroups.com.