Author Topic: Old micro-prosessors  (Read 2755 times)

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Offline TeslaHV9Topic starter

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Old micro-prosessors
« on: November 08, 2009, 08:17:17 PM »
Dellagd and I drop by a place that sells and repairs old videogames to see if they had any junk boards to give us that they were going to throw away. We got a few good old miroprosessors and continually tried to call the companies that made them but they were no help at all. What we really need is a scematic and/or datasheet of at least one of these so we can try to build MCU out of it. We were hoping someone on SoR could help us. Here are the models of the ones we got:

HITACHI FD1094

Motorala MC6808P 7L 7923

Zilog 70840006PSC

NEC D27C2001D-15 8948P9017

Thanks for all your help!

-Tesla
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Offline Razor Concepts

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Re: Old micro-prosessors
« Reply #1 on: November 08, 2009, 08:20:14 PM »
Those may be special branded chips those companies make for a certain run of products - so datasheets may not be available.
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Offline SmAsH

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Re: Old micro-prosessors
« Reply #2 on: November 08, 2009, 11:27:37 PM »
And chances of getting a useful microcontroller/processor out of them is very low...
One that you can program that is.
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Offline GearMotion

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Re: Old micro-prosessors
« Reply #3 on: November 09, 2009, 06:33:17 AM »
Zilog 70840006PSC

If memory serves me correctly, this is a Z80 microprocessor. Microprocessors are not microcontrollers. They need RAM, ROM/FLASH, ports, etc.
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Offline billhowl

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Re: Old micro-prosessors
« Reply #4 on: November 09, 2009, 07:43:20 AM »
6808 microcontroller - DIP 40 package
http://www.cpu-world.com/info/Pinouts/680x.html
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Offline Soeren

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Re: Old micro-prosessors
« Reply #5 on: November 09, 2009, 11:32:22 AM »
Quote from: TeslaHV9 on November 08, 2009, 08:17:17 PM
What we really need is a scematic and/or datasheet of at least one of these so we can try to build MCU out of it.
I have to ask... Why?
CPUs are cheap, no reason to build with old chips that you cannot replace if/when it dies.


Quote from: TeslaHV9 on November 08, 2009, 08:17:17 PM
HITACHI FD1094
Custom made 68000 (µprocessor, made for Sega, by Hitachi).


Quote from: TeslaHV9 on November 08, 2009, 08:17:17 PM
NEC D27C2001D-15 8948P9017
UVEPROM, 2 Mb = 256kb x 8 = 256kB.
Needs an EPROM programmer
Can be used for program storage for a µprocessor.
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Offline TeslaHV9Topic starter

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Re: Old micro-prosessors
« Reply #6 on: November 09, 2009, 03:16:29 PM »
Quote from: Soeren on November 09, 2009, 11:32:22 AM
Quote from: TeslaHV9 on November 08, 2009, 08:17:17 PM
What we really need is a scematic and/or datasheet of at least one of these so we can try to build MCU out of it.
I have to ask... Why?
CPUs are cheap, no reason to build with old chips that you cannot replace if/when it dies.

well we figured we could try get out of it whatever we could without spending to much money. And yes the Hiatchi is the Z80 prosessor. Thanks so much to Billhowl.

-Tesla


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Offline TeslaHV9Topic starter

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Re: Old micro-prosessors
« Reply #7 on: November 11, 2009, 06:33:53 PM »
Can anyone find anything on the NEC or Zilog chips?...............

 ??? ??? ??? ??? ??? ??? ??? ??? ???

.....................hello?.........................


 ??? ??? ??? ??? ??? ??? ??? ??? ???

............................................Anyone?..................
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Offline GearMotion

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Re: Old micro-prosessors
« Reply #8 on: November 12, 2009, 09:02:40 AM »
Quote from: TeslaHV9 on November 11, 2009, 06:33:53 PM
Can anyone find anything on the NEC or Zilog chips?...............

 ??? ??? ??? ??? ??? ??? ??? ??? ???

.....................hello?.........................


 ??? ??? ??? ??? ??? ??? ??? ??? ???

............................................Anyone?..................

Google "Z80" to learn about the z80. http://www.amazon.com/s/ref=nb_ss_6_3?url=search-alias%3Daps&field-keywords=z80+microprocessor&sprefix=z80

http://en.wikipedia.org/wiki/Zilog_Z80

http://www.zilog.com/docs/z80/z8400.pdf
« Last Edit: November 12, 2009, 09:09:17 AM by GearMotion »
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Offline TeslaHV9Topic starter

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Re: Old micro-prosessors
« Reply #9 on: November 12, 2009, 07:45:19 PM »
Thanks gearmotion!


Does anyone have anything on the NEC chip? We have 14 of them.

 ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ???
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Offline GearMotion

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Re: Old micro-prosessors
« Reply #10 on: November 12, 2009, 08:03:24 PM »
Quote from: TeslaHV9 on November 12, 2009, 07:45:19 PM
Thanks gearmotion!


Does anyone have anything on the NEC chip? We have 14 of them.

 ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ???

Re read the thread. Soeren did:
Quote
UVEPROM, 2 Mb = 256kb x 8 = 256kB.
Needs an EPROM programmer
Can be used for program storage for a µprocessor.

If you have an EPROM programmer (and a UV eraser) you can load hex files into this chip. It could be the "ROM" for the Z80.

« Last Edit: November 12, 2009, 08:05:05 PM by GearMotion »
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Offline TeslaHV9Topic starter

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Re: Old micro-prosessors
« Reply #11 on: November 13, 2009, 08:27:10 AM »
I'll ask Dellagd about that.



What exactly is a UV eraser? I may have something that will work as makeshift one.
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Offline jka

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Re: Old micro-prosessors
« Reply #12 on: November 13, 2009, 08:51:47 AM »
Quote from: TeslaHV9 on November 13, 2009, 08:27:10 AM
I'll ask Dellagd about that.



What exactly is a UV eraser? I may have something that will work as makeshift one.
the chip has a small window on top, perhaps beneath a label. When you shine UV light through it for some time, it will erase the chip.
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Offline TeslaHV9Topic starter

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Re: Old micro-prosessors
« Reply #13 on: November 14, 2009, 06:22:46 AM »
well thats useful!

I was wondering what the window was for.

Does anyone have schematics for the NEC chip so dellagd and I could work out a microcontroller?
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Offline jka

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Re: Old micro-prosessors
« Reply #14 on: November 14, 2009, 07:49:07 AM »
Are you sure that it's worth the trouble? The Eprom needs a special programming circuit, where you place the chip, program it and then you move it to the circuit where you want to use it. If you have made an error, you have to erase it, which can take about 30 minutes, move the chip to the programming circuit, write the new program, move the chip back to your circuit and retest.

I think you will end with spending more time and money getting this to work, than you will spend buying a new micro-controller, that supports in-circuit programming. On the other hand, if you can learn a lot about computers building your own computer from a CPU, RAM, ROM, UART etc. It's actually quite fun. I'll suggest you find some documentation and datasheets on your CPU and your EPROM chip and start reading. Search google for the name of your chip +datasheet or go to the website of the manufacturer of the chip and search there. Sometimes you can find datasheets and implementation notes there.

Good luck
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