• Please review our updated Terms and Rules here
  • From now on we will require that a prefix is set for any items in the sales area. We have created regions and locations for this. We also require that you select a delivery option before posting your listing. This will hopefully help us streamline the things that get listed for sales here and help local people better advertise their items, especially for local only sales. New sales rules are also coming, so stay tuned.
  • Exhibitor application for VCF West 2022 is now open! If you are interested in exhibiting, please fill out the form here.
  • Here are the results of the VCF East 2022 Post Event Survey: Survey Results

Flashing / emptying / dumping (e)eproms, Amsterdam area

Alfred Werner

New Member
Joined
Feb 7, 2010
Messages
2
Location
Germany
Hello Erwin,

i have an Old IBM 5160.

Recently it shows a defect.
When i start it, i hear a coninously sound (no beep)

By changing Chips from another of my 5160 s i found out:

The Bios Chip 1501512 is faulty.

Now my question:

Do you have a chance to burn (may be an EPRON 27256) as replacement for that chip?

Or another idea how i can get it working again?

Thank you very much in advance


Best regards



Alfred
 

modem7

Veteran Member
Joined
May 29, 2006
Messages
7,790
Location
Melbourne, Australia
Hello Erwin,
I just now took a look at Erwin-c64's profile. He last logged in at 2014.
Per [here], pietja is also in the Netherlands.

By changing Chips from another of my 5160 s i found out:
The Bios Chip 1501512 is faulty.
So, chip U18 of the 11/08/82 dated BIOS.

Now my question:
Do you have a chance to burn (may be an EPRON 27256) as replacement for that chip?
Or another idea how i can get it working again?
Because the 5160 was previously working, we can rule out a bent pin on the 1501512 ROM.

And because another 5160 BIOS ROM set worked, the ROM support circuitry, and the sockets, are good.

Try cleaning the pins on the 1501512 ROM. If that fails to rectify the situation, then the only fixes are:
* Substitution with a good 1501512 ROM; or
* Substitution with a suitably programmed 27C256 (or equivalent).

The code to go into a 27C256 EPROM (or equivalent) is at [here]. The fact that the faulty ROM is 1501512, together with your "i have an Old IBM 5160", implies that you have the early ('64-256KB') version of the IBM 5160 motherboard. Therefore, per [here], whoever programs the EPROM needs to know not to use an NEC branded 27C256.
 
Top