Ver. 1.76B - fix problem of reading CD-ROM with sub-directories that have files that does not use the (8.3) file format

Ver. 1.75B - Solve bugs with playing Music CD in V1.74 .

Ver. 1.74B - CD-ROM drive operation bug found in Bios V1.73, problem fixed in V1.74

Ver. 1.73B -  Press 'Play' button to close CD-ROM drive's tray. CD-ROM will then load itself, Enable error try in data loading so you can read CD-R of more brands in your V64's CD drive and Easy upgrade: prevents the problem of just showing 'loading...' and reducing the chances of
an unsuccessful Bios upgrading.

Ver. 1.72B - Speed up the time of 'waiting...' when you first power on V64 and press 'Play' to load game CD, and Reduce loading time for game CD, faster access to file selection screen.

Ver. 1.71B - Added the function of swapping bytes in DRAM to run other's non-swapped file format games. This function can be access from the 'Functions Menu' and Speed up the operation of 'upload DRAM data to PC' to half the time and maintaining the
reliability with early versions.

Ver. 1.70B - Works with new released 'tpc2' & 'v64io2', communication between V64 and PC without problems in all printer port setting (ECP, EPP, SPP). V1.70 is also 100% compatible with previously released 'tpc' and 'v64io'. 'tpc2' and 'v64io2' is also 100% compatible with Bios version prior to 1.70. (V1.70 is also compatible with PCs that has printer port which does not
comply to industrial standard. Problem is cause by PCs which do not supports bi-directional signal pins, this kind of printer port cannot work with Bios prior to V1.70. ). Plus All sub-directories in CD will be displayed with a special icon 'sun icon' before its name and Allows more brands of CD-ROM Drive to be used with V64

Ver. 1.61B - Skip headers reading of game files by pressing the 'Menu' button to go into file selection immediately, No more headers reading procedure after the first loading time. The headers reading procedure will run once and all information will be stored into memory until CD is changed,  Modify background color of V64's screen by changing the 3rd & 4th byte of the Bios to new values : 6b, 80 for green; 80, 80 for black; 6b, ff for blue, Choose the start point of V64' screen in H/V offset by changing the 5th(V) & 6th(H) byte of the Bios to new values and finally  Well improved ATAPI command control allows more CD drives of different models and different brands to be used in Doctor V64 (Panasonic, Sony, Toshiba, Mitsumi, Hitachi, Liteon, etc).

Ver. 1.60B - Two new functions added, able to read the 128k byte data from DX256 and upload to PC or download the 128k byte data from PC to DX256, Enhance the power of file/directory processing. Game name, version and file size will be shown in bottom of screen upon the cursor pointing to a game in file selection operation. Empty directory can exist in CD (it will cause error in Bios V1.53 and Able to read the content of MSDOS text files (.txt) on V64's display (max. 2Kbyte). Text files can store informations on game program, '.IPS' and '.SAV' file.