Northstar Horizon

<Nowadays, it's really tempting to use an EPROM or Battery-Backed SRAM to <hold the entire CP/M CCP, BDOS, and BIOS, and let the warm boot reload the <CCP from there. That would certainly make the control-c quicker. Nowadays! I did this back in early 81 using 2732s. I put a monitor, bios, ZCPR2 and BDOS in that. The CCP and BDOS only eats 5.5k. It was set up rather odd as the system runs from a small 2716 at cold boot with a monitor and then by user command loads the 8k image into ram from IO addressed "romdisk". The CTRL-C was very fast as it could do INIR copies from the rom. A later version still running is 256k of eprom (27512s) had all of cpm, loader, ASM, VEDIT, SID (and more). This version the boot EEprom is at 0000 and is truncated bdos, bios and a loader. This was done so that I could have it load CPM.SYS image for testing from the selected drive including the ROMDISK. This is raw speed. Allison