🇸🇰 SMEP PP 01: Part 6 (New Keyboard - Quick Look) [TCE #0477]
32Thanks to Peter, Jeramy & #PCBWAY for all their help ...
[1] Peter at www.sapi.cz for providing his original keyboard schematic;
[2] Jeramy @JVHShack for patiently re-designing to accept Cherry MX key switches; and
[3] PCBWAY for fabbing and shipping the boards to me for free!
Obviously my PP01 still needs a lot of work to get up and running (hopefully!) again.
Part of that is a new ROM board to replace the 16 x 1KByte ROMs with a single 16KByte ROM ... maybe there's an issue in one, or more, of the mixture of EPROMs and masked ROMs.
I've also now got an SD-ROM board for when the machine is working again, so I can load software via SD card.
ROM board:
https://www.8bity.cz/2019/nhrada-desky-rom-sm-2251-pro-poctac-pp-01/
SD-ROM module:
https://pp01.borik.net/index.php?pg=sdrom
From Part 1:
SMEP = Systém Malých Elektronických Počítačov (Small Electronic Computer System), and
PP 01 = Personálny Počítač (Personal Computer).
It was developed at the Computing Technology Research Institute (Výskumnom Ústave Výpočtovej Techniky = VÚVT) in Žilina and manufactured at the Computing Technology Plant (Závodoch Výpočtovej Techniky = ZVT) in Banská Bystrica (now in independent Slovakia).
A good source of information & emulator:
https://pp01.borik.net/index.php
An excellent set of re-drawn schematics can be found here:
https://www.sapi.cz/klony_sm5040/pp01.php