Stojke wrote:Can an V30 be installed in a place of an 8088 (8MHz) ?
As above, the V30 is for 8086 systems, so V20 is your only option.
Alternatively you could use something like an Intel InBoard, which is an ISA card that connects to the CPU socket. These are available in 286 and 386 models.
Stojke wrote:And an additional question, how do 8BIT RAM cards work? Can I install one into Philips NMS9100? (originally has 768k)
The Philips already has more than the maximum conventional memory installed. 640k is the maximum an 8088 system normally supports. The extra 128k is 'hidden' somewhere in the range between 640k and 1m (not sure where exactly, I have a Philips NMS9105 myself, same configuration), not used by most software, because it's specific to that type.
There are two types of RAM cards... One is to extend the conventional memory up to 640k. These are mainly meant for old IBM 5150/5160 systems, which could not have 640k installed on the mainboard. You don't want those.
The other type is so-called Expanded Memory, or EMS. This is what you want if you want to go beyond 640k.
EMS is a bank-switching system, where you can see a small part ('bank') of memory at a time (usually up to 32k or 64k, depending on the exact type of card). But with some simple commands, the CPU can switch banks, so you can move through larger parts of memory. This allows you to use multiple megabytes of memory in an 8088 system, which is technically only capable of addressing 1m (of which the upper 384k is reserved for BIOS, hardware I/O and such, hence the 640k memory limit).
Mind you, EMS only works for software that has explicit support for it. Most software for 8088 will run fine with 640k however.
