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Z80 Max speed can be 10MHz or 16MHz. Currently the Z67-IDE+ can do 10 MHz when booting from it. With the SSI board installed the Z67-IDE+ can do 16MHz without any issues. For now select 10MHz via jumper. If you need a 10MHz oscillator let me know.
Norby
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Voltage Controlled Crystal Oscillator (VCXO) or Voltage Controlled Oscillator
VCXOs incorporate a control voltage pin that controls the output frequency around the nominal frequency. The extent of frequency control is called the pull range which typically ranges from ±50 ppm to ±200 ppm but can extend to ±3200 ppm for SiTime VCXOs. VCXOs are often used in discrete jitter attenuation and clock recovery applications.
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Been a while since I've been into building PCBs. Prepping for the V4 motherboard which is asking for a 16.384Mhz oscillator.
Also, the top 7805 regulator gets super hot whereas the bottom one is not even warm. All chips are cool to the touch. Is this normal?
Yes it is normal. Please attached both regulators to the H8 heatsink bracket or add a heatsink under them. I have mine attached to the H8 heatsink and on my other board I use the Pololu regulator to eliminate the heat.
Do not leave the regulators without any heatsinks.
Glad that the board is fully functional. It is a great board.
Thanks,
Norberto
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Here are some examples:
Terry’s solution: It comes with the caps.
Pololu Reg: These days are very expensive ☹
Flat bracket: 7805
Regular H8 bracket: 7805
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Hmmm… Just change the following jumper to find out if it does helps out. I think you are using position 1-2. Try position 2-3 on JP6 in case the H17 sides are reversed.
Norberto
All (Norberto),
Trying to boot H17 disks with the V3.1 board. When I press 2 on the keypad to boot H17 it doesn't work, it activates the drive and seems like it is trying to boot but it fails. It then re-seeks and tries again. After 3 tries it gives up and beeps. I'm booting CP/M 2.2 on 3.5 via HSFE. If I swap out the board with a DG80 with XCON8 then it'll boot fine. So the HSFE and drives and disk are working. I'm using the PAM37/MMS ROM on a 27C256 that Norberto sent me a while back.
I know I'm way behind the times here so maybe this was solved a while ago.
Any ideas?
Thanks!
Pic below to show jumper settings
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Great that it worked. This is the schematic for such circuit. We will need to update the jumper description when using the Heath H17 controller vs my H17 controller which uses position 1-2. Great catch.
Thanks,
Norby
BINGO! That was it.
Norby, I can't express how grateful I am (we are) to have you on our team. You are so helpful and knowledgable and with just a vague description of a problem you know exactly how to fix it.
Thank you!
Les
On Sunday, September 5, 2021 at 2:26:24 PM UTC-4 Norby wrote:
Hmmm… Just change the following jumper to find out if it does helps out. I think you are using position 1-2. Try position 2-3 on JP6 in case the H17 sides are reversed.
Norberto
All (Norberto),
Trying to boot H17 disks with the V3.1 board. When I press 2 on the keypad to boot H17 it doesn't work, it activates the drive and seems like it is trying to boot but it fails. It then re-seeks and tries again. After 3 tries it gives up and beeps. I'm booting CP/M 2.2 on 3.5 via HSFE. If I swap out the board with a DG80 with XCON8 then it'll boot fine. So the HSFE and drives and disk are working. I'm using the PAM37/MMS ROM on a 27C256 that Norberto sent me a while back.
I know I'm way behind the times here so maybe this was solved a while ago.
Any ideas?
Thanks!
Pic below to show jumper settings
On Thursday, September 2, 2021 at 10:59:51 PM UTC-4 Norby wrote:
Here are some examples:
Terry’s solution: It comes with the caps.
Pololu Reg: These days are very expensive ☹
Flat bracket: 7805
Regular H8 bracket: 7805
To view this discussion on the web visit https://groups.google.com/d/msgid/sebhc/3a59b3c1-e406-4550-bf25-ca8ab9b38f01n%40googlegroups.com.