modem7
10k Member
The BIOS of the VGA card will reside at address C0000.What is the chip EPROM for this card ?
The VGA BIOS is split to two EPROM mays be is two 27128 or 27127 ?
Something that often (not always) works is:
1. Run DEBUG per [here], except type in "dc000:0"
2. Note the third byte (10 in the example pointed to).
3. To work out the code size, convert the third byte from hex to decimal, then multiply that by 512 bytes.
E.g. 40 hex = 64 decimal. 64 x 512 bytes = 32 KB. A code size of 32 KB suggests two 16 KB ROM's (e.g. two of 27C128).
E.g. 30 hex = 48 decimal. 48 x 512 bytes = 24 KB. A code size of 24 KB suggests two 16 KB ROM's (e.g. two of 27C128).