I’ve never see or tried this clone, so hard to say other than give it a try...
See also this site and here, also see the Wikipedia page on the U880.
Mark
Keyboard problem ZX Spectrum plus
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1024MAK
- Bugaboo
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- Location: Sunny Somerset in the U.K. in Europe
Re: Keyboard problem ZX Spectrum plus
Standby alert “There are four lights!”
Step up to red alert. Sir, are you absolutely sure? It does mean changing the bulb
Looking forward to summer later in the year.
Re: Keyboard problem ZX Spectrum plus
The Eastern Germany Z80A clone seems to work fine
Yes, boot to Sinclair logo takes a little longer, I need to refresh my Z80 assembly knowledge to find out how the RAM-CHECK Routine works and determine the top of the RAM
Not sure but I think it runs a little hotter than the ST i had but not sure.
I have no keyboard yet, I'm waiting for the keyboard PCB connectors to arrive, but I manage to run a testram app by shorting dedicated Columns and Rows on the PCB for the appropriate keys to run the app.
It passes the Ram test fine.
Thanks everyone for their help.
Thanos
Yes, boot to Sinclair logo takes a little longer, I need to refresh my Z80 assembly knowledge to find out how the RAM-CHECK Routine works and determine the top of the RAM
Not sure but I think it runs a little hotter than the ST i had but not sure.
I have no keyboard yet, I'm waiting for the keyboard PCB connectors to arrive, but I manage to run a testram app by shorting dedicated Columns and Rows on the PCB for the appropriate keys to run the app.
It passes the Ram test fine.
Thanks everyone for their help.
Thanos
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Ast A. Moore
- Rick Dangerous
- Posts: 2641
- Joined: Mon Nov 13, 2017 3:16 pm
Re: Keyboard problem ZX Spectrum plus
Glad you were able to sort it all out. Cheers!thanospl wrote: ↑Fri May 03, 2019 9:43 am The Eastern Germany Z80A clone seems to work fine
Yes, boot to Sinclair logo takes a little longer, I need to refresh my Z80 assembly knowledge to find out how the RAM-CHECK Routine works and determine the top of the RAM
Not sure but I think it runs a little hotter than the ST i had but not sure.
I have no keyboard yet, I'm waiting for the keyboard PCB connectors to arrive, but I manage to run a testram app by shorting dedicated Columns and Rows on the PCB for the appropriate keys to run the app.
It passes the Ram test fine.
Thanks everyone for their help.
Thanos
Every man should plant a tree, build a house, and write a ZX Spectrum game.
Author of A Yankee in Iraq, a 50 fps shoot-’em-up—the first game to utilize the floating bus on the +2A/+3,
and zasm Z80 Assembler syntax highlighter.
Author of A Yankee in Iraq, a 50 fps shoot-’em-up—the first game to utilize the floating bus on the +2A/+3,
and zasm Z80 Assembler syntax highlighter.
-
1024MAK
- Bugaboo
- Posts: 3118
- Joined: Wed Nov 15, 2017 2:52 pm
- Location: Sunny Somerset in the U.K. in Europe
Re: Keyboard problem ZX Spectrum plus
Good progress 
Mark
Mark
Standby alert “There are four lights!”
Step up to red alert. Sir, are you absolutely sure? It does mean changing the bulb
Looking forward to summer later in the year.
Re: Keyboard problem ZX Spectrum plus
Unfortunately that progress was for a little while.
I don't have a real keyboard yet and I just making contact with wires between the two connectors to have a key-press
I probably make a wrong contact somehow and now I don't have any key on the row 2 (KB1 of the ULA)
Any press on that Row making either nothing, or reset. or strange patterns on the screen (photo posted)
I 'm afraid that i fried the ULA, what do you think guys?
Thanos
I don't have a real keyboard yet and I just making contact with wires between the two connectors to have a key-press
I probably make a wrong contact somehow and now I don't have any key on the row 2 (KB1 of the ULA)
Any press on that Row making either nothing, or reset. or strange patterns on the screen (photo posted)
I 'm afraid that i fried the ULA, what do you think guys?
Thanos
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Ast A. Moore
- Rick Dangerous
- Posts: 2641
- Joined: Mon Nov 13, 2017 3:16 pm
Re: Keyboard problem ZX Spectrum plus
Possibly, but first, put the old CPU back in and retest.
Every man should plant a tree, build a house, and write a ZX Spectrum game.
Author of A Yankee in Iraq, a 50 fps shoot-’em-up—the first game to utilize the floating bus on the +2A/+3,
and zasm Z80 Assembler syntax highlighter.
Author of A Yankee in Iraq, a 50 fps shoot-’em-up—the first game to utilize the floating bus on the +2A/+3,
and zasm Z80 Assembler syntax highlighter.
Re: Keyboard problem ZX Spectrum plus
I did. Does the same think (besides A14 is shorted to ground)