Search found 5 matches
- Thu Dec 21, 2023 6:13 pm
- Forum: Hardware
- Topic: Timing on ROM expansion port / ROMOEH
- Replies: 12
- Views: 1333
Re: Timing on ROM expansion port / ROMOEH
thx Pr0f, that was my next plan, wiring the shr OE to the ROMOE (inverted) to ensure not driving the bus when i shouldnt (i wanna definitely not damage something). and i need to be more selective (in hardware) so this only happens between c000 and ffff (gal or and, *mabye* the pic's clc because that...
- Tue Dec 19, 2023 6:25 pm
- Forum: Hardware
- Topic: Timing on ROM expansion port / ROMOEH
- Replies: 12
- Views: 1333
Re: Timing on ROM expansion port / ROMOEH
thx Pr0f, i guess i'll try if i could statically set something on the SHR and just drive the databus as long as ROMOE is high to see if it would work if i would not have to shift-out, access the mcu ram and so on. if you say 250ns would be the worst case, and 120s best, i could imagine the PIC cycle...
- Mon Dec 18, 2023 6:41 pm
- Forum: Hardware
- Topic: Timing on ROM expansion port / ROMOEH
- Replies: 12
- Views: 1333
Re: Timing on ROM expansion port / ROMOEH
thx @peter,
puh, 30ns is quite tight.
puh, 30ns is quite tight.
- Mon Dec 18, 2023 6:01 pm
- Forum: Hardware
- Topic: Timing on ROM expansion port / ROMOEH
- Replies: 12
- Views: 1333
Timing on ROM expansion port / ROMOEH
Hi all, i'm currently trying my first steps with hardware on QL (basically tinkering...) and decided to go for the rom expansion port (not the expansion port on the left). What i basically tried is to use a PIC (PIC18F27K42 @ 64mhz) and wired up A0-A15, ROMOEH and D0-D7, then in the PIC simply check...
- Sat Oct 14, 2023 3:51 pm
- Forum: The Welcome Area
- Topic: Servus from Austria
- Replies: 5
- Views: 5412
Servus from Austria
Servus from Linz, Austria !
finally, i'm having a QL again !
after like 35 years, and straightaway found my way to this forum with tons of interesting stuff. love it !
finally, i'm having a QL again !
after like 35 years, and straightaway found my way to this forum with tons of interesting stuff. love it !