Peter this is a good way to get used to Z80 code. I’m traveling and don’t have access to the code but just switch conditional jumps to straight jumps. For example JP Z, TRYSER to JP TRYSER. BTW read the text before the code carefully, that monitor is quite dense and carefully laid out to get as much as possible in a small space. Good luck John From: n8vem...@googlegroups.com [mailto:n8vem...@googlegroups.com] On Behalf Of Peter Clark yes, that does. I missed that section on IOBYTE in the comments. Looking at the CSTS routine, I'm thinking I could just do an unconditional jump to SERIAL_STAT instead of reading IOBYTE. Does that seem right? Forgive me, I'm new to Z80 assembler :) I'm assuming it's ok to shrink the code by a few instructions... Like this: ;<<<<<<<<<<<<<<<<<<< MAIN CONSOL STATUS ROUTINE >>>>>>>>>>>>>>>>>>>>>> CSTS: IN A,(CONSOL_STATUS) AND 02H JP Z,TRYSER ;See if input from Serial Port is req XOR A DEC A ;RETURN WITH 0FFH IN [A] IF SOMETHING RET TRYSER: JP SERIAL_STAT ;Force serial IO
Hi Peter, First cannot hear sound on your subsequent video. Anyway If I understand your setup/problem the reason you are not getting the monitor to come up in your system using the serial port is because you are not using the SMB. That board had a simple input port (IOBYTE) which determines where the console data will come from. The Propeller drive “Console IO board” – using a IBM PC PST style keyboard is the default. If there is no SMB in your system the Z80 “Master” monitor will read it as 0FFH – the default configuration. Bit 5 determines the source of the console input. This is all documented at the start of the monitors code listing. See:- http://s100computers.com/Software%20Folder/Master/Master.htm It’s easy to change the code to always assume the serial port for the console – just look at the CO:, CSTS: and CI: routines. Hope this helps John From: n8ve...@googlegroups.com [mailto:n8ve...@googlegroups.com] On Behalf Of Peter Clark Hi All, I'm fairly new to the community, and have been reading up on the projects, and working towards building some boards for my IMSAI 8080. I've learned a lot so far, and also realized that what I first thought would be simple is far more complicated than I thought! :) I'm glad though because I'm having loads of fun learning about computers I dreamed about having/using when I was much younger and expanding my understanding at the same time. Anyway, I'm trying to get started with a pretty simple configuration and expand from there. The config I'm trying to get started with is an IMSAI 8080 chassis with a Z80 Master CPU Board V2, 4 vintage 8k ram cards (confirmed working), and a Serial IO board V2. I'll add a Dual CF IDE card and Dual Floppy card once I get this working. I've got the Z80 CPU and Serial IO card built and I'm now trying to test them in my IMSAI. I've assembled the Master.Z80 (Low and High) and burned to a 27C64 and it looks to me like I correctly got the two separate 4k rom banks into the one rom. Although I'm not sure. I read the rom back into my buffer and confirmed the same start code at both 0H and 1000h. I've got my old laptop w/serial port hooked up to port 'a' of the serial card as well as the usb port, and have tera term running for each serial port. Both cards are configured from the instructions on the S100computers site, although I'm thinking I probably have made some errors with the jumpers. I've compared my setup to some others who have posted pictures, but I have specific concern for the ROM configuration, and the rom address setup. Testing When I turn on the IMSAI, on the Z80 card I get the bus master and low rom lights, but no rom enable light. When I examine F000 from the front panel, the rom enable light lights up bright, then when I press RUN it dims a little, but stays on constant. It appears to me that the monitor is running at this point, but I'm not getting anything on either of the serial ports of the serial card, other than that they echo back whatever I type to them. Pictures of my CPU and serial io card are attached. Any help with jumper configuration, and configuration to support the CPU/Serial IO card combo would be greatly appreciated. -- -- |