07-05-2022, 01:02 AM
Food for thought,
Not all may realise but it is possible, all be it, an under utilization of the DRAM Coreboard, but by replacing ROM 1 with Microworld Basic V5.22 burnt into a 128K EPROM the board will boot up and behave as a standard 32K ROM Basic machine. Add into the ROM2 location, Wordbee or EDASM (or any of the ROMs designated for the C000h - DFFFh PAK location) and you can call this with the PAK command from basic, just as you would in a normal ROM base machine.
For the adventurous, you could even use a 512K EPROM in location of ROM2 and with a little minor track modification and with decoding Port 04 and a latch you could have eight PAK locations that could be easily called from basic with the PAKx command. You could even set up your port decoding and latch in some of the unused real estate that was left for the SCC and associated hardware on the right hand side. Alternately PORT 04 may still be available on X5 pin8 depending on what Mainboard configuration you have, in which case you will just need the latch 4042 or similar as talked about in the FLASH ON ROM MICROBEES topic.
Just a thought
Ernest
Not all may realise but it is possible, all be it, an under utilization of the DRAM Coreboard, but by replacing ROM 1 with Microworld Basic V5.22 burnt into a 128K EPROM the board will boot up and behave as a standard 32K ROM Basic machine. Add into the ROM2 location, Wordbee or EDASM (or any of the ROMs designated for the C000h - DFFFh PAK location) and you can call this with the PAK command from basic, just as you would in a normal ROM base machine.
For the adventurous, you could even use a 512K EPROM in location of ROM2 and with a little minor track modification and with decoding Port 04 and a latch you could have eight PAK locations that could be easily called from basic with the PAKx command. You could even set up your port decoding and latch in some of the unused real estate that was left for the SCC and associated hardware on the right hand side. Alternately PORT 04 may still be available on X5 pin8 depending on what Mainboard configuration you have, in which case you will just need the latch 4042 or similar as talked about in the FLASH ON ROM MICROBEES topic.
Just a thought
Ernest