Going Retro

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It's been a while since I've been confronted with something like this...

 

 

..a fun little kit...

 

 

...first spotted here...

 

https://hackaday.io/project/1599...

 

 

...and bought from here...

 

https://shop.mcjohn.it/en/diy-ki...

 

#1 This forum helps those that help themselves

#2 All grounds are not created equal

#3 How have you proved that your chip is running at xxMHz?

#4 "If you think you need floating point to solve the problem then you don't understand the problem. If you really do need floating point then you have a problem you do not understand." - Heater's ex-boss

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Just need an 8" floppy interface & drive & I can use some of my files again....

Or maybe they were modern 5 1/4 types

When in the dark remember-the future looks brighter than ever.   I look forward to being able to predict the future!

Last Edited: Sun. Jul 28, 2019 - 02:49 PM
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Remember, use a hole punch to punch a write notch in the other side and you can use both sides of the floppy!

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Do they come with OS images, or did you have to scrounge that up separately?

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kk6gm wrote:

Do they come with OS images, or did you have to scrounge that up separately?

 

No, the kit came with a uSD card with loads of stuff on it. There's also a PC utility which can transfer stuff onto the 16 virtual floppies on the uSD, each of which holds 8Mbytes.

#1 This forum helps those that help themselves

#2 All grounds are not created equal

#3 How have you proved that your chip is running at xxMHz?

#4 "If you think you need floating point to solve the problem then you don't understand the problem. If you really do need floating point then you have a problem you do not understand." - Heater's ex-boss

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It's a cool design.  I designed the PCB for v1 of the project (https://hackaday.io/project/19000-a-4-4ics-z80-homemade-computer-on-breadboard), and did the Forth Port ("Just Because")  They won some prize money and went on to make the improved v2, so now I'm stuck with orphans - But I'm not quite motivated to build more.

 

I think the basic operation is very clever - doing an IO access (or some memory accesses?) trips a wait-state-inducing flipflop, and then the AVR32 goes and manipulates to bus "at its leisure."  I've been thinking that you could do the same thing with other old-school architectures (6502, 6809, ...)

 

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The likes of a Cortex M3/4 with enough ram does a good emulation in only 1 chip! For the sdcard interface, i used fatfs and mapped the cp/m disks as files. Do a fseek to goto the relative sector then read/write 128 bytes. No clunk of the head load solenoid though.

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Emulating the CPU isn't "retro" enough, but emulating the IO is OK.

 :-)

 

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It’s a fine line! Using modern memory devices is ‘ok’ as long as it is DIP package!

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Cool find!

The largest known prime number: 282589933-1

It's easy to stop breaking the 10th commandment! Break the 8th instead. 

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I met with this guy recently:
https://thehighnibble.com/imsai8080/#overview

I liked the web emulation of the Cromemco Dazzler board.

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Kartman wrote:
I met with this guy recently: https://thehighnibble.com/imsai8... I liked the web emulation of the Cromemco Dazzler board.

 

I always wanted to get a few "Microangelo" boards for my S100 computer.

The largest known prime number: 282589933-1

It's easy to stop breaking the 10th commandment! Break the 8th instead. 

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Kartman wrote:
It’s a fine line! Using modern memory devices is ‘ok’ as long as it is DIP package!

 

Well, I'm building the retro processor and simulating the memory... just call me awkward :)

 

Neil