derkom's attempt

[kodak80]

A question about QG1 ("CRYSTAL 32MHz"): I have a 32.00000 MHz oscillator in DIP-14 package, but I notice the link to @exxos's store is for a 32.084988 MHz unit. What's the difference going to cause here? Is my 32 MHz appropriate?

I asked the same question here: https://www.exxosforum.co.uk/forum/viewt ... 266#p27995 32.0mhz will get it working.

[exxos]

You can use 32mhz, just your scores will all be 99% not 100% and probably demos won't run. Though it will boot and run.

[derkom]

I asked the same question here: https://www.exxosforum.co.uk/forum/viewt ... 266#p27995 32.0mhz will get it working.

Oops, so you did.

You can use 32mhz, just your scores will all be 99% not 100% and probably demos won't run. Though it will boot and run.

Okay. I'm planning to socket it anyway, so I'll toss in a proper crystal in my next order from your store and swap it out.

[Icky]

Okay. I'm planning to socket it anyway, so I'll toss in a proper crystal in my next order from your store and swap it out.

I went for the socket route and then had to take the socket out and solder it in directly. The reason is that the a PSU does not fit with the oscillator in a socket as its too tall.

[derkom]

H4-004.jpg (115.38 KiB) Viewed 3361 times

All caps installed except the ones by the DAC, all diodes installed, and most pin headers installed. I installed only one auxiliary power connector because the 4-pin power connectors require sanding down to fit in next to the PSU connections and each other. If I ever need more than one of them, I'll probably just install regular pin headers.

A couple of notes about the headers:

- JP13 and JP20 are not listed on the BOM. Should be on there as JP1E jumper blocks (or is there a reason they're missing?).
- "JP22" is not actually printed on the PCB. This is the jumper right next to BAD DMA.

A word of advice for soldering the larger pin headers (FRAM, DMA), which those of you who have done this a lot probably already know: Skip pins while soldering to keep the plastic on the header block from softening and letting your pins get out of alignment.

[exxos]

- JP13 and JP20 are not listed on the BOM. Should be on there as JP1E jumper blocks (or is there a reason they're missing?).

Are these on the PCB ? I cant find the things

- "JP22" is not actually printed on the PCB. This is the jumper right next to BAD DMA.

You mean JP2 ?

[derkom]

- JP13 and JP20 are not listed on the BOM. Should be on there as JP1E jumper blocks (or is there a reason they're missing?).

Are these on the PCB ? I cant find the things

Heh, JP13 is between SMT GLUE and 32 MHz OSC and JP20 is right next to the keyboard connector.

- "JP22" is not actually printed on the PCB. This is the jumper right next to BAD DMA.

You mean JP2 ?

No, I mean whichever is the three pin block right to the left of BAD DMA. By process of elimination, it had to be JP22.

[Icky]

@exxos and I were discussing the jumpers and what is required to boot.

I’ll be adding to the build guide tonight which jumpers to have in place to be able to boot.

[derkom]

@exxos and I were discussing the jumpers and what is required to boot.

I’ll be adding to the build guide tonight which jumpers to have in place to be able to boot.

I've been wondering about that. I'm still a ways off, but it has occurred to me that I can't even try to boot the thing because I don't know what most of the jumpers do.

[exxos]

Heh, JP13 is between SMT GLUE and 32 MHz OSC and JP20 is right next to the keyboard connector.

JP20 needs to be jumpered ( its to break the LED for use with *some other project" think it was IDE LED break-out jumper.. I forget )

JP13, needs to be jumpered, its part of flashy-clock to "disable" the onboard ROM in the future..

No, I mean whichever is the three pin block right to the left of BAD DMA. By process of elimination, it had to be JP22.

Oh yep, 2 & 3, Its part of the not yet done GAL bit for 1.44 floppy control.

1.jpg (29.36 KiB) Viewed 3351 times