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Message

Author :: Oles

Posted :: 2015-04-22 02:28:59 PM

Subject :: PMD-85A

Hello!
Sorry i dont know Czech language but maybe anybody can help me.

I have PMD-85A computer but don't have EPROM chips inside(((
I want to know where i can get ROM files, and what types EPROM chips i must have? for use in this computer?
Please help!

Message

Author :: Roman Bórik

Posted :: 2015-04-22 08:58:47 PM

Subject :: Re: PMD-85A

Hello.

All ROM files you can find inside PMD 85 Emulator ZIP package (Rom folder). See Download section on our site.

If you have PMD 85-2A, use monit2B.rom (rather than monit2A.rom). It is 4kB file that you need split into four 1kB files and Write them into 1kB EPROMs (2708, К573РФ1).

Message

Author :: Oles

Posted :: 2015-04-23 09:36:54 PM

Subject :: Re: PMD-85A

aga! good! thank you!

but maybe i can use one 2732 chip?
Or will be better have one 2764 chip (and write here two images 4+4 kb) ? This is possible?

Message

Author :: Roman Bórik

Posted :: 2015-04-23 10:00:20 PM

Subject :: Re: PMD-85A

Unfortunately, without HW changes on the main board, not. Main board contains four 24 pin DIP sockets for 1kB EPROM 2708.

Message

Author :: Oles

Posted :: 2015-04-23 10:12:43 PM

Subject :: Re: PMD-85A

(( This is bad

I undestand i need make some changes on board but one 2764 chips is better then four 2708
Anybody do this?

Message

Author :: Roman Bórik

Posted :: 2015-04-24 11:50:53 AM

Subject :: Re: PMD-85A

On the following site you can find whole schematic of the PMD 85-2A (other models PMD 85 too).
http://www.sapi.cz/pmd-85/pmd85-2a.php
You can try to replace old 1kB ROMs by new 4kB/8kB ROM.
ROM begins at 8000h and ends ar 8FFFh. Keep in mind that ROM is mirrored from 0A000h to 0AFFFh.

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