Apollo 1240 problems

Steve67 · 16 January 2018, 14:31

Bought a apollo 1240 off ebay as untested when i plugged it in it doesnt recognise any ram, i have tried 10 different sticks 4mb to 16 mb but it shows none installed
Also system info shows it running at 25mhz instead of 40, I have checked the crystal and it's an 80mhz
I have cleaned all the contacts but no change
Has anyone got any suggestions
Thanks
Steve

Chucky · 16 January 2018, 16:47

common issue is one of the 74f257 that is dead

Steve67 · 16 January 2018, 17:12

What is the 74f257 ?

Steve67 · 16 January 2018, 17:15

Where can I get a replacement ?

Chucky · 16 January 2018, 17:22

the 3 chips at the top of the board. and if you do not know. do NOT solder it yourself but let someone with solderexperience handle it.

JUST to be sure.. you DO have a jumper at the "RAM" location?

Steve67 · 16 January 2018, 17:26

The ram jumper is set correctly, the long Rom chip next to the ram looks like 1 of the pins has been broken and soldered back on, I think this is the chip you mentioned earlier

Chucky · 16 January 2018, 17:28

My guess is that you need to replace that one

Steve67 · 16 January 2018, 17:36

Where do I get it from and does it need programming ?

Chucky · 16 January 2018, 18:26

no they are standard chips. but. if you do not know this: please do not even try to do it yourself. have someone to do it for you.

but ebay etc etc

Steve67 · 16 January 2018, 18:42

Hello the chip is NMC27C256BQ200 which as far as I can tell is an eprom that fits in a socket on the board which is as easy to change as changing motherboard rom chips but doesn't it need programming as it had a sticker on it saying 40/55

Chucky · 16 January 2018, 18:44

ehh no.. just don't it is like putting a car in a place where you want cheese...

hand it over to someone with electronics knowledge.

Steve67 · 16 January 2018, 18:52

Can you suggest anyone ?

Chucky · 16 January 2018, 18:53

Someone here? I will not be able to help until. well. May maybe. (too much stuff to fix)

Chucky · 16 January 2018, 18:54

but if you do not know about these compoenents for your boards case: do not even try to fix it yourself or you might break it even more.. I have seen too many "this cannot be that hard to do" killing PCBs.

Steve67 · 16 January 2018, 19:03

I would rather get someone who knows what they are doing to fix it, I can change things that are in sockets but I can't solder to save my life, I did ask amigakit but they don't repair old memory cards

Steve67 · 16 January 2018, 19:21

I see from some of the other threads on this card that they can be upgraded to 1260 if they have the mach 131 chip which mine does would it be advisable to do this at the same time as having the other bits done ? Is it worth the extra cost ?

Chucky · 16 January 2018, 19:25

I do such upgrades (and it works with mach 130 aswell) I charge 180eur+shipping for such an upgrade.. this is with a working board.

Chucky · 16 January 2018, 19:30

and YES it is worth it

Steve67 · 16 January 2018, 19:44

When would you be able to consider taking this job on ?
Next month ?
Would this include replacing the other chips ?

Chucky · 16 January 2018, 19:45

UPGRADE I can take anytime. and if it is ONLY change that 74f257 I can do it.. BUT if it involves any kind of troubleshooting. I will not have time until May!

16 January 2018, 14:31	#1
Steve67 Registered User Join Date: Jan 2018 Location: Southampton, england Posts: 10	Apollo 1240 problems Bought a apollo 1240 off ebay as untested when i plugged it in it doesnt recognise any ram, i have tried 10 different sticks 4mb to 16 mb but it shows none installed Also system info shows it running at 25mhz instead of 40, I have checked the crystal and it's an 80mhz I have cleaned all the contacts but no change Has anyone got any suggestions Thanks Steve

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Problems with Apollo (1240?) card	Amiga1992	support.Hardware	33	01 January 2014 12:14
A1200 IDE recognition problems with Apollo 1240 [Solved]	Hedeon	support.Hardware	5	31 October 2013 21:40
Apollo 1260 to a 1240 problems	Kitch	support.Hardware	26	15 December 2012 07:17
Apollo 1240 problems, I think...	fitzsteve	support.Hardware	49	12 October 2010 19:04
Apollo 1240	DDNI	support.Hardware	34	20 June 2006 20:29

16 January 2018, 16:47	#2
Chucky Registered User Join Date: Mar 2015 Location: Karlstad / Sweden Age: 52 Posts: 1,210	common issue is one of the 74f257 that is dead

16 January 2018, 17:12	#3
Steve67 Registered User Join Date: Jan 2018 Location: Southampton, england Posts: 10	What is the 74f257 ?

16 January 2018, 17:15	#4
Steve67 Registered User Join Date: Jan 2018 Location: Southampton, england Posts: 10	Where can I get a replacement ?

16 January 2018, 17:22	#5
Chucky Registered User Join Date: Mar 2015 Location: Karlstad / Sweden Age: 52 Posts: 1,210	the 3 chips at the top of the board. and if you do not know. do NOT solder it yourself but let someone with solderexperience handle it. JUST to be sure.. you DO have a jumper at the "RAM" location?

16 January 2018, 17:26	#6
Steve67 Registered User Join Date: Jan 2018 Location: Southampton, england Posts: 10	The ram jumper is set correctly, the long Rom chip next to the ram looks like 1 of the pins has been broken and soldered back on, I think this is the chip you mentioned earlier

16 January 2018, 17:28	#7
Chucky Registered User Join Date: Mar 2015 Location: Karlstad / Sweden Age: 52 Posts: 1,210	My guess is that you need to replace that one

16 January 2018, 17:36	#8
Steve67 Registered User Join Date: Jan 2018 Location: Southampton, england Posts: 10	Where do I get it from and does it need programming ?

16 January 2018, 18:26	#9
Chucky Registered User Join Date: Mar 2015 Location: Karlstad / Sweden Age: 52 Posts: 1,210	no they are standard chips. but. if you do not know this: please do not even try to do it yourself. have someone to do it for you. but ebay etc etc

16 January 2018, 18:42	#10
Steve67 Registered User Join Date: Jan 2018 Location: Southampton, england Posts: 10	Hello the chip is NMC27C256BQ200 which as far as I can tell is an eprom that fits in a socket on the board which is as easy to change as changing motherboard rom chips but doesn't it need programming as it had a sticker on it saying 40/55

16 January 2018, 18:44	#11
Chucky Registered User Join Date: Mar 2015 Location: Karlstad / Sweden Age: 52 Posts: 1,210	ehh no.. just don't it is like putting a car in a place where you want cheese... hand it over to someone with electronics knowledge.

16 January 2018, 18:52	#12
Steve67 Registered User Join Date: Jan 2018 Location: Southampton, england Posts: 10	Can you suggest anyone ?

16 January 2018, 18:53	#13
Chucky Registered User Join Date: Mar 2015 Location: Karlstad / Sweden Age: 52 Posts: 1,210	Someone here? I will not be able to help until. well. May maybe. (too much stuff to fix)

16 January 2018, 18:54	#14
Chucky Registered User Join Date: Mar 2015 Location: Karlstad / Sweden Age: 52 Posts: 1,210	but if you do not know about these compoenents for your boards case: do not even try to fix it yourself or you might break it even more.. I have seen too many "this cannot be that hard to do" killing PCBs.

16 January 2018, 19:03	#15
Steve67 Registered User Join Date: Jan 2018 Location: Southampton, england Posts: 10	I would rather get someone who knows what they are doing to fix it, I can change things that are in sockets but I can't solder to save my life, I did ask amigakit but they don't repair old memory cards

16 January 2018, 19:21	#16
Steve67 Registered User Join Date: Jan 2018 Location: Southampton, england Posts: 10	I see from some of the other threads on this card that they can be upgraded to 1260 if they have the mach 131 chip which mine does would it be advisable to do this at the same time as having the other bits done ? Is it worth the extra cost ?

16 January 2018, 19:25	#17
Chucky Registered User Join Date: Mar 2015 Location: Karlstad / Sweden Age: 52 Posts: 1,210	I do such upgrades (and it works with mach 130 aswell) I charge 180eur+shipping for such an upgrade.. this is with a working board.

16 January 2018, 19:30	#18
Chucky Registered User Join Date: Mar 2015 Location: Karlstad / Sweden Age: 52 Posts: 1,210	and YES it is worth it

16 January 2018, 19:44	#19
Steve67 Registered User Join Date: Jan 2018 Location: Southampton, england Posts: 10	When would you be able to consider taking this job on ? Next month ? Would this include replacing the other chips ?

16 January 2018, 19:45	#20
Chucky Registered User Join Date: Mar 2015 Location: Karlstad / Sweden Age: 52 Posts: 1,210	UPGRADE I can take anytime. and if it is ONLY change that 74f257 I can do it.. BUT if it involves any kind of troubleshooting. I will not have time until May!

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)