ascii was originally created with a 7 bit system using 128 characters.
was originally created with a 7 bit system using 128 characters?
ascii
the acronym isbt was originally derived from the important role played by the international society of blood transfusion (isbt) in the development of the standard. today it expands as international standard for blood and transplant. the number 128 reflects the 128 characters of the ascii 7 bit character set that the standard uses.





























the international council for commonality in blood banking automation (iccbba) was established in 1995 and given the responsibility for implementation and management of the new standard.
isbt 128
bullet::::- battery backed non-volatile ram and small size allowing it to be powered off, transported, and powered back on and resume activities on the currently loaded program or document.





























and was originally packaged as a two board unit with the lower "main board" containing all components except the system memory which was mounted on the upper "core board".





























the original main board consisted of:





























bullet::::- z80 cpu





























bullet::::- z80 pio





























bullet::::- 6545 crt controller





























bullet::::- 2 kb screen ram





























bullet::::- 2 kb character rom (128 characters)





























bullet::::- 2 kb programmable character graphics (pcg) ram (128 characters)





























bullet::::- keyboard





























bullet::::- speaker
microbee