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IORQ active, others not active

by Eugeny_Brychkov on 24-12-2016, 00:58
Score: 138.38 %, Type: Forum topic , Comments: 2 comments
I am experimenting with my machine, and it appears to have IORQ active for long time - at least 280 ns, with RD and WR being inactive. I can not have picture of M1, because it is just not routed to the board. However M1+IORQ situation is only possible (according to Z80 manual) in IM0 mode as interrupt ...

Batch 4 of GR8NETs is ready for distribution

by Eugeny_Brychkov on 05-12-2016, 10:47
Score: 138.26 %, Type: Forum topic , Comments: 7 comments
Please contact me for more information - and see manual here . Are there any hardware Are there any hardware differences between the 4 batches? The only difference is that The only difference is that from batch 2 on there're ...

HB-501P (MSX1) port I/O issue

by Eugeny_Brychkov on 20-10-2016, 21:04
Score: 137.75 %, Type: Forum topic , Comments: 17 comments
program 2.1 that I created here: https://www.msx.org/forum ... https://www.msx.org/forum/msx-talk/general-discussion/reques... , but you had forgotten to update openMSX ... Actually, you needed the obvious proof ... (+5V) or down (0V) but hardware that uses open collector logic can only drive the bus down or leave ...

Identify if BASIC text is variable or constant/formula

by Eugeny_Brychkov on 08-10-2016, 01:32
Score: 137.49 %, Type: Forum topic , Comments: 2 comments
I need to organize input/output from assembler program into same variable. For example, CALLFUNCTION(A,B,C). But it also can be CALLFUNCTION(,,C) or CALLFUNCTION(1,2,3). Is there any safe way to check if text pointed to is variable (e.g. "A") ...

Zemmix Neo (and probably OCM) issue

by Eugeny_Brychkov on 20-04-2016, 17:52
Score: 135.62 %, Type: Forum topic , Comments: 17 comments
(0.5 T-cycle) after IORQ activates and ends with IORQ; WR: port data write Situation is the same as with port read: for OCM activtion of WR signal is delayer by 0.5 T-cycles. My ... write 0.5 T-cycles later than Z80. MSX cardridge port signals MSX cardridge port signals ...
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