No, no LED.. and actually.. I just tried something.. and apparently it's the opposite. (so it's n0p's fault.. lol and now i can't delete my post)
@n0p If I put my jumper on, i can switch between 4.77 and 8... but with the jumper off, it's ONLY 4.77... (according to syscheck).. so it appears we were slightly wrong..... gah. Did you test or was this all just from the schematic?
Ah thanks.
@n0p could you perhaps write a simple program that just emulates pressing the key combination to activate turbo (if turbo is not already on) to put in autoexec.bat (or config.sys I don't know)
I'll have to crack it back open, find a 20k resistor (you think it needs ot be that high?) and at least i can still use the wiring, jsut move it (if this works)As i have a spare board now, i've quick tested that at least for sanity check.
Pin 14 from STM now goes to pin 2 on CLPD.
It still has 5V on it on start (see photo).
I can suggest that in V2 you need to pull pin 2 down as it seems on V2 it treats floating state on that pin as "turbo off".
Quick test would be - jumper off, 20K resistor to ground from pin 2.
I'll have to crack it back open, find a 20k resistor (you think it needs ot be that high?) and at least i can still use the wiring, jsut move it (if this works)
Too strong of a pullup/down can make it hard to overcome and too weak.. yeah.., and I'm more likely to find a 10k than a 20k... no local electronic stores around here anymore.I'm unsure of exact needed value, just to be on the safe side. Here Sergey suggests 10K is good enough: https://forum.vcfed.org/index.php?t...ards-working-9600.1244414/page-2#post-1334871
Dear n0p, I have a book 8088 v2 with ISA expansion board, and I want to have the opportunity to connect it to external VGA flat panel display. I am from Kyiv as well. I tried to do it in the following ways: connected an external ISA VGA card, but unfortunately it was 16bit, I hoped it would operate in 8bit mode, but no. If I understand correctly it is possible to built in VGA out connector. Unfortunately, I am not very good in soldering, as I am not that young. I am willing either to buy an external 8bit VGA card which would be compatible, or built in an VGA connector, I will pay for everything .<phone number removed>. Thank You!You're welcome!
For VGA issues you can ask seller for replacement LCD board - they would send it w/o any problems. Simplest way to check LCD fw - set mode 12h (via checkit or https://github.com/jinshin/Book8088/blob/main/MODE12H.COM). Blank screen - you have CGA firmware.
To some point, external screen mod for VGA would be easy, as it already has VGA connector, just in different form and doesn't require any convertors. But it won't look nice.
You'll need to make a connector, for board it's 12P 1.25mm https://www.aliexpress.com/item/1005006003135511.html and solder a VGA DE-15 to it.
Board connector pinout attached
iirc @Yrouel tried some time ago - flashing LCD board EEPROM chip directly on board, as i found some 800x480 firmwares and wanted to test them with some efficient way.
Yeah with my TL866CS I usually have issues trying to program these kind of EEPROMs while mounted, it always complains about high current so I end up having to desolder them.
Looking forward to read more about the new firmwares you're testing. Also have you seen the user on Vogons that managed to program it through DDC?
Wonder if it'll work under Wine... (Otherwise it's a Windows VM or thin client for it)A bit more. Microprocessor inside RTD2660 appears to be Intel 8051. Reko https://github.com/uxmal/reko/releases (to my surprise) evolved to quite good state since last time i checked and decompiles RTD firmware quite nice. Other thing is what we should look for? :D Would be nice to have hacked and unhacked fw to compare and have some starting point.
Dear n0p, I have a book 8088 v2 with ISA expansion board, and I want to have the opportunity to connect it to external VGA flat panel display. I am from Kyiv as well. I tried to do it in the following ways: connected an external ISA VGA card, but unfortunately it was 16bit, I hoped it would operate in 8bit mode, but no. If I understand correctly it is possible to built in VGA out connector. Unfortunately, I am not very good in soldering, as I am not that young. I am willing either to buy an external 8bit VGA card which would be compatible, or built in an VGA connector, I will pay for everything .<phone number removed>. Thank You!
Thank You! And if the display is disconnected from the side of the motherboard, will the internal notebook display be operational after that? As I plan to use the book not only as the stationary one with the external monitor, but as standalone computer as well. If need be there is no problem for me to buy all the necessary connectors and spares, just please provide a link to the store.I just need to get a DE-15 connector for that. No promises thought
Вітаю!
Я тоже не молод и паять толком научился наверное год как
Но не проблема, у меня просто нет коннекторов и поиск займет некоторое время.
Не обещаю, но скорее всего через неделю-две сделаю пару коннекторов для VGA.
Смотрите, там один момент - нужно будет отключить дисплей со стороны материнской платы. Вам это будет норм?
Thank You! And if the display is disconnected from the side of the motherboard, will the internal notebook display be operational after that? As I plan to use the book not only as the stationary one with the external monitor, but as standalone computer as well. If need be there is no problem for me to buy all the necessary connectors and spares, just please provide a link to the store.
Вітаю! А смогу я после этого пользоваться ноутбуком если я потом отключу внешний дисплей? Вы скажите, если необходимо, я могу купить необходимые разъемы, только дайте ссылку на них.
Thank You! I believe many forum members would like to know the results of your tests!Straight answer requres testing on my side. So far idea is to disconnect internal display and connect cable for external. I do understand that might be quite a problem switching those. But i've no idea will connecting parallel cable work normally, as there might be voltage drop. CGA has TTL signals, VGA is another story. VGA connectors are not a problem, but i coudn't find 12P 1.25 connectors in Ukraine, and waiting for a month from Ali might be too much. I have a couple for testing, and migh tget to it next week.
Тут как. Пока идея в том, чтобы подлючить внешний дисплей вместо внутреннего. Это технически некрасиво, нужно выкручивать 9 шурупов каждый раз и т.д. Но я очень не уверен, будет ли работать подключение в параллель, т.к. напряжение на выходе может упасть. Надо проверять. Кабели JST 1.25 на 12 пин в Украине не купить, вообще нет. Но у меня есть пара штук, на тесты хватит.
В любом случае VGA коннектор будет некрасиво торчать из корпуса в районе портов.
С Буком V1 именно впилить разьем было не проблема, там прям на плате было запланировано гнездо, проблема была найти и купить RGB2HDMI конвертор.
Как бы то ни было, отпишу, когда/если что-то получится.