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Author Topic: Creating EXDOS card clone (Read 144712 times)

Offline Zozosoft

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Re: Creating EXDOS card clone
« Reply #15 on: 2014.September.12. 22:20:18 »
Great work!
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Offline pear

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Re: Creating EXDOS card clone
« Reply #16 on: 2015.April.21. 12:59:05 »
This is my version of EXDOS.
Redesigned by me. Prototype PCB has few mistakes (my fault), but it works.

EDIT:
I had no idea of the existence of the Spanish project.
Today I found a thread on this topic on retrowiki.es.
Did I accidentally to tread on someone's corns ? ;)
Sorry :)
« Last Edit: 2015.April.21. 14:14:20 by pear »
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Offline Zozosoft

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Re: Creating EXDOS card clone
« Reply #17 on: 2015.April.21. 20:16:10 »
Quote from: pear on 2015.April.21. 12:59:05
This is my version of EXDOS.
Nice!
Can you upload some photos?

For the schematic used the full - too complex - address decoding, or make a simplier fixed address solution?
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Offline pear

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Re: Creating EXDOS card clone
« Reply #18 on: 2015.April.21. 20:36:55 »
These are the prototypical items :) Not really beautiful :)
Fixed addressing. Decoder made on a single chip GAL.
In this version, I forgot about a few little things. I do not have far too many pics, because I have to refine the design.
This project is done in three days, because I was sorry to use the original FDD (serial number 607), which was barely saved.
For the time being attached pictures before and after renovation.
« Last Edit: 2015.April.21. 20:42:55 by pear »
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Offline Zozosoft

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Re: Creating EXDOS card clone
« Reply #19 on: 2015.April.21. 21:23:11 »
Quote from: pear on 2015.April.21. 20:36:55
For the time being attached pictures before and after renovation.
Great work! But need a new ENTERPRISE label at the front and recreate the serial number :-)
And now we know who bought this unit :-)
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Offline pear

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Re: Creating EXDOS card clone
« Reply #20 on: 2015.April.21. 21:26:46 »
Already done. :)
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Offline pear

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Re: Creating EXDOS card clone
« Reply #21 on: 2015.May.02. 19:13:44 »
I'm done :)
EXDOS with two floppy drives connected via FlexiBridge.
I used a modified drives Samsung SFD321B-LFEB. They are fixed to DS/DD mode (the factory does not have switches DD/HD).
I checked the operation of power circuits.
EXDOS card stabilizer warms up to a maximum of 41°C during operation of both drives (load approx. 0.9 A).
The stabilizer in FlexiBridge has a temperature of about 36°C.
The highest temperatures are in the rectifier Schottky diodes - up to 60°C (nothing serious, but warm).
The ammeter on video shows the total current. The computer itself draws 1.3 A (measure at picture below).
The prototype board has a few shortcomings (some bad connections, inverted bridge socket), but after a few corrections works properly
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Offline Zozosoft

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Re: Creating EXDOS card clone
« Reply #22 on: 2015.May.02. 19:20:32 »
Great work! :smt038

Little suggestion: with WD1772 use 3ms Step Rate, then the drive will be faster and more silent :-)
Write VAR 73,3 into EXDOS.INI or use modified ROM which sets it to 3 as default.
« Last Edit: 2015.May.02. 19:25:03 by szipucsu »
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Offline pear

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Re: Creating EXDOS card clone
« Reply #23 on: 2015.May.02. 19:22:24 »
ROM version of EXDOS is 1.4 (modified in 2014 by Zozosoft :) )
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Offline Zozosoft

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Re: Creating EXDOS card clone
« Reply #24 on: 2015.May.02. 19:29:54 »
Try this.
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Offline pear

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Re: Creating EXDOS card clone
« Reply #25 on: 2015.May.02. 19:35:34 »
I wonder if I can remove EPROM without unscrewing ? :oops:
It's time to get on with the card RAM/Flash/Clock.
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Offline ssr86

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Re: Creating EXDOS card clone
« Reply #26 on: 2015.May.02. 21:01:02 »
Looks great
...So with this one can dig up his old PC 3.5" disc drive and use it with an Enterprise...or are there some restrictions or mods required?

(also where do you all get those stickers from?;P)
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Offline pear

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Re: Creating EXDOS card clone
« Reply #27 on: 2015.May.02. 21:27:44 »
In FDD connect pin 2 Disk Change signal, pin 34 Ready signal , pin 10 Drive A Select or pin 12 Drive B Select.
The rest unchanged.
Stickers I made myself in CorelDRAW.
On one sheet of A4 self-adhesive paper to fit dozens of them (included in attachment) :)
« Last Edit: 2015.May.03. 18:32:16 by pear »
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Offline Zozosoft

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Re: Creating EXDOS card clone
« Reply #28 on: 2015.May.06. 10:50:08 »
Quote from: pear on 2015.May.02. 21:27:44
In FDD connect pin 2 Disk Change signal, pin 34 Ready signal
These not used by EXDOS at default, then not important.

Quote
, pin 10 Drive A Select or pin 12 Drive B Select.
Without this any drive can work as drive B:

I suggest add onboard jumpers for these on the next version. Then easy to use with original flat cable, or PC/AT type twisted cable (and no jumpers on drive), with any old or modern drives.
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Offline pear

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Re: Creating EXDOS card clone
« Reply #29 on: 2015.May.06. 10:55:02 »
Good idea!
Earlier, I transformed already floppy disk drives for other platforms and already so out of habit modify the drive, not the interface :)
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