Orton 3C ROM programmer

[Peter Onion]

I picked up a Orton 3C kit at yesterday's RC2014 Assembly.

I'm sure I will soon want to expand the code in the ROM, so what tools do people use for programming 39SF010As ?

PeterO

[Paul Hunt]

I bought a Xgecu T48 programmer, and used it successfully on the 512K 39SF040.

[Peter Onion]

On Sun, 2025-09-21 at 04:09 -0700, Paul Hunt wrote:
> I bought a Xgecu T48 programmer, and used it successfully on the 512K 39SF040.
>

I already have the excellent
https://z80kits.com/shop/39sf040-programmer-rom-writer-for-romwbw/
for doing 39SF040s.

I was asking about something for the smaller 39SF010A.

PeterO

> On Sunday, 21 September 2025 at 20:05:33 UTC+10 Peter Onion wrote:
> > I picked up a Orton 3C kit at yesterday's RC2014 Assembly.
> >
> > I'm sure I will soon want to expand the code in the ROM, so what tools do people use
> > for programming 39SF010As ?
> >
> > PeterO
> >

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[Mark T]

Just use a 39sf040 on the Orton 3c and ground the two extra address lines if they are not already connected in the pcb.

[Peter Onion]

On Sun, 2025-09-21 at 07:56 -0700, Mark T wrote:
> Just use a 39sf040 on the Orton 3c and ground the two extra address lines if they are
> not already connected in the pcb.

Ah ! That's a good idea. I have a couple of spare '40s I use when I'm developing RomWBW
device drivers.

I hadn't actually checked that they were the same number of pins.

Thanks.

PeterO

[Mark T]

The orton 3c rom module has A17 to 0v and A18 to 5v, so program the data in the third quarter of the 39sf040.

[Spencer Owen]

Hi Mark,

I think the schematic for the Orton 3C ROM might be a bit misleading. Both pin 1 and 30 are pulled to ground. Pin 31 (PGM) is pulled high, although the "VCC" lable looks like it is on Pin 1. I should change that to make it a bit more obvious what is going on there.

Thanks

Spencer

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[Ed Silky]

I built a programmer using a RPi Pico (RP2040) for that series of chips.

-Ed

To view this discussion, visit https://groups.google.com/d/msgid/rc2014-z80/bf4d3269-7ce0-4497-88b8-734b13250f9e%40z80kits.com.

[Peter Onion]

On Sun, 2025-09-21 at 09:40 -0700, Ed Silky wrote:
> I built a programmer using a RPi Pico (RP2040) for that series of chips.
>
> -Ed

Ed,

Is you code available anywhere ?

Experienced RP2040 and RP2350 C programmer here.

PeterO

[Mark T]

I see it now, its just the Vcc label from below.

I thought it was a bit odd, but that you might have done that to make it easier to route Vcc to pin 32 via pin 1.