marwood@DMC-CRC.ARPA (G. J. Marwood) (03/06/87)
I am looking for some help from someone who is very familiar with the Applicard system. A copy of the CCP, BDOS and BIOS is kept in the Apple host and is loaded to the Applicard during a cold boot. On warm boot a fresh version of the CCP and BDOS is loaded. What I would like to do is to make additional space in the BIOS region, to put some additional code which I have developed for using the CTC chip as a real time clock. I currently have this code patched to the BIOS, but hanging outside of it. It is not kept in the Apple but has to be loaded by means of an initialization program. It would be far neater if some of this code could be permanently placed in the BIOS area. To do this I need to lower the starting point of CP/M in the Apple from the present position of 9100H. This starting point is established by the coldboot routine and is easy to adjust. However, I suspect that simply changing this starting point may cause problems to the some of the other code which resides in the Apple. I am familiar with the CCP, BDOS and BIOS bit maps but I think that there may be other things to consider. I would like to discuss these matters with anyone who is familiar with the Applicard to this level of detail. I have added to the end of this note the PCPI6502.MAP file (from SIMTEL20 PD:<CPM.APPLE>) to illustrate what is happening in the Apple. Thank you in advance, Gordon Marwood Unofficial Map of Apple 6502 Memory as used with PCPI Applicard +----------------------------+- C000h | RWTS for Apple Disks | +----------------------------+- B800h | Default Driver | +----------------------------+- B730h | CP65 | +----------------------------+- B000h | BIOS _____________ | +---------- | | -+- A700h | BDOS | Z-80 | | +---------- | IMAGE | -+- 9900h | CCP |___________| | +----------------------------+- 9100h | Apple Video (Word) | +----------------------------+- 8FBAh | Other Video (Word) | +----------------------------+- 8FB6h |Poll Routine Table (65bytes)| +----------------------------+- 8F75h | Card-Type Table (8 bytes) | +----------------------------+- 8F6Dh |Cons. Comm. Table (109bytes)| +----------------------------+- 8F00h | Device Table (256bytes) | +----------------------------+- 8E00h | Host Buffer Size | +----------------------------+- (8E00h - Buffersize) HIMEM | FREE MEMORY | +----------------------------+- LOWMEM | DRIVERS | +----------------------------+- 0900h | Cold Boot Code/ Parameter | | Passing Block | +----------------------------+- 0800h | Text Page 1 | +----------------------------+- 0400h | Reset Vector/Power Up Byte | +----------------------------+- 0300h | Scratch | +----------------------------+- 0200h | 6502 Stack | +----------------------------+- 0100h | ------+- Hi P0 | ------+- Lo P0 | Page 0 | | | +----------------------------+- 0000h rev 1.0 6/7/86