STM32 + Gotek floppy emulator

dwight
Posts: 4
Joined: Sat Jul 22, 2017 1:46 am

Re: STM32 + Gotek floppy emulator

Post by dwight » Fri Aug 04, 2017 3:32 am

Hi
I'm knew to this MB. I'm interested in a boot loader for these with the STM32105 chips.
I'm mostly interested in emulating floppies for things that are obsolete. My worst case is
machine that uses 32 hard sectored 8 inch floppies. I'd sent a message to the fellow in France
that sells various emulators for a number of more common vintage machines
but he doesn't seem interested in my problem.
I've only played with the Arduino a little. I wrote a simple pong game to play on one
of those tiny oled displays. I also wrote code to make a pendulum clock calibrator.
This was done in C that I'm not that versed in.
I've looked at the source code for one of the boot loaders when I was thinking of making
it so I could write to flash without the write protect bit getting in the way.
I never finish that as I was making small ( smaller ) 6530 to 6532 adapters for the KIM-1
computer. I'd also written diagnostic code for the board to run on a board that would
plug onto the expansion connector and take over from the onboard ROM.
My first code was to do a RAM test without using an RAM( tricky on a 6502 with only 4 registers ).
It sounds like this board is the right place to be when I have questions.
Dwight

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RogerClark
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Re: STM32 + Gotek floppy emulator

Post by RogerClark » Fri Aug 04, 2017 5:21 am

dwight wrote:
Fri Aug 04, 2017 3:32 am
Hi
I'm knew to this MB. I'm interested in a boot loader for these with the STM32105 chips.
This may work on the F105.

https://github.com/rogerclarkmelbourne/ ... bootloader

Its written for the 103 but I'm pretty sure it runs on the 101

BTW. Do you really mean the STM32F105 or do you mean the F103 as there aren't may F105 boards that I'm aware of

zmemw16
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Location: St Annes, Lancs,UK

Re: STM32 + Gotek floppy emulator

Post by zmemw16 » Fri Aug 04, 2017 12:03 pm

aliexpress search for stm32f105 finds 93, only board is from this store https://www.aliexpress.com/store/121628 ... 7e60z8zfGs
search in store finds it
srp

dwight
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Joined: Sat Jul 22, 2017 1:46 am

Re: STM32 + Gotek floppy emulator

Post by dwight » Sat Aug 12, 2017 4:41 am

The Gotek has the F105 on it. I don't mind experimenting with it as it
was cheap. It is intended to be a floppy emulator for music keyboards.
A fellow in France has written emulators to run on it for most clasic
computer, like TRS80 and Atari 800s.
I've got kind of odd ball stuff in mind. He is more into licensing his
code. It is not much incentive to write code for a machine that, to
my knowledge, there are only 5 in existence.
I expect to be writing much of it in assembly but I'd like to write the
first level of code in C and then rewrite the needed parts in assembly
where speed is more critical. Writing signals out to look like a floppy is
the easy side. Sampling MFM data on the fly and encoding it in an
efficient data form is a little more tricky.
The Gotek board was design to work as a floppy. As the famous last
words, all it needs it the software.
Dwight

dwight
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Joined: Sat Jul 22, 2017 1:46 am

Re: STM32 + Gotek floppy emulator

Post by dwight » Sun Aug 13, 2017 1:40 am

I was looking at the STM3210x document, RM0008. The STM32F107 has a different
USB port that the STM32F103s have. Is that going to be an issue?
Dwight

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RogerClark
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Re: STM32 + Gotek floppy emulator

Post by RogerClark » Sun Aug 13, 2017 8:17 am

You can probably use STM's new core for the F1xx

www.github.com/stm32duino

However, they only released the new version for the F1 in the last few weeks and don't support many boards yet.

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