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Author Topic: Videopac C7420 Basic Modul - Problems  (Read 590 times)
Rene_G7400
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« Reply #15 on: October 06, 2017, 10:28:42 AM »

Yes, these connections are right.
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Fraser9999
Trying to get the cartridge in...
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Posts: 16


« Reply #16 on: October 07, 2017, 05:24:39 PM »

Hello,

At the Basic BOX.

Does anybody know if ROM 4764 PIN 20 (CE Chip Enable)
is "Active Low"  or "Active High"

If "Active High" i have to add an inverter for the 28C64 EEprom?

On the 28C64  Pin 20 (CE);  Eprom is active when Pin is low?

Thanks
Hermann


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Rene_G7400
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« Reply #17 on: October 07, 2017, 10:12:18 PM »

They are all "active-low".
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gertk
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« Reply #18 on: October 08, 2017, 10:52:55 AM »

In the circuit diagram both select signals CSM1 and CSM2 have a 'bar' on top of the text meaning active low.
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>>G7000 G7200(P+S) G7400 N60 JET27 VG5000 ZX80 ZX81 ORIC-1 COMX35 Aquarius<<
Fraser9999
Trying to get the cartridge in...
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Posts: 16


« Reply #19 on: October 08, 2017, 05:12:42 PM »

Thanks much!

My Rom to EEprom Adapter is ready.

Now waiting for 28C64 EEproms to come
Perhaps on Wednesday.

Greetings,
Hermann
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Fraser9999
Trying to get the cartridge in...
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Posts: 16


« Reply #20 on: October 08, 2017, 05:23:00 PM »

One more Question!

can I read out the 2316 Rom(Coupling Cart) with 2kb Data Space
on the Settings for a 27C64 Eproms with 8kb Data Space
in my Burner?

Does the Burner know where to Stop reading
when i let the Rest of Adresslines empty?

I will make a Connection InCircuit with 24 Micro-Probes
to my Burner Socket???
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Fraser9999
Trying to get the cartridge in...
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Posts: 16


« Reply #21 on: October 08, 2017, 05:30:24 PM »

Its a Batronix Eprom Burner 4 with Parallel Port Interface
and i use Prog-Studio 6.
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Fraser9999
Trying to get the cartridge in...
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Posts: 16


« Reply #22 on: October 08, 2017, 06:07:13 PM »

I have study The Burner Manual and have
seen the he could read 2kb EEproms from Typ 28C17

i hope this could work?
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gertk
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« Reply #23 on: October 10, 2017, 05:57:50 AM »

If you get the correct pinout for the 2 k ROM inside the cartridge it should be no problem to read it out.
EEPROM's run on 5 Volt only so there is little danger.

I attached a copy of my 2k rom
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>>G7000 G7200(P+S) G7400 N60 JET27 VG5000 ZX80 ZX81 ORIC-1 COMX35 Aquarius<<
Fraser9999
Trying to get the cartridge in...
*
Posts: 16


« Reply #24 on: October 11, 2017, 04:01:00 PM »

Hello,

28C64 EEproms arrived,today

Have burned the first half of the c7420.bin File,
on the Chip.

And now, the C7420 Basic Modul is working !!!


Thanks much, for the Help!

Greetings,
Hermann
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gertk
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« Reply #25 on: October 12, 2017, 05:59:16 AM »

Great to see it working again!
Well done.
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>>G7000 G7200(P+S) G7400 N60 JET27 VG5000 ZX80 ZX81 ORIC-1 COMX35 Aquarius<<
minodk
Played Munchkin once...
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« Reply #26 on: October 14, 2017, 06:18:37 PM »

I'm impressed!

A good work is at its place: Good work!

/Michael
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