Autor ::Oles Poslaná :: 22.04.2015 14:28:59 Predmet ::PMD-85A
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?
Autor ::Roman Bórik Poslaná :: 22.04.2015 20:58:47 Predmet ::Re: PMD-85A
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).
Autor ::Oles Poslaná :: 23.04.2015 21:36:54 Predmet ::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?
Autor ::Roman Bórik Poslaná :: 23.04.2015 22:00:20 Predmet ::Re: PMD-85A
Unfortunately, without HW changes on the main board, not. Main board contains four 24 pin DIP sockets for 1kB EPROM 2708.
Autor ::Oles Poslaná :: 23.04.2015 22:12:43 Predmet ::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?
Autor ::Roman Bórik Poslaná :: 24.04.2015 11:50:53 Predmet ::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.