Hello everyones, first of all thanks greatly for the complete help to "usuario_msx2" ,and thanks also for made a specific DIY 512K RAM manual for Hb-F9s to follow, his help makes me to decide to do this my first MSX mod , it will be possible to change some things of this install in a near future, how put the NPN and Diode in a piece of mini pcb, or use the socket for the Sony Firmware calculator to put the RAM HM658512LP-8, it will be good to avoid a lot of cable wires. For the moment i post any images, probably this could help anyone with a HB-F9s.
*PCB view*
*RAM and HCT´s mounted*
*General install view and Zooms*
I hope will be here soon with more info of installs in HB-F9s, i´m just learn about msx hardware and trying collect info for the MSX2 HB-F9s.
Thanks again for the help.