Search found 1163 matches
- Wed Jan 27, 2021 10:20 pm
- Forum: 8 BIT CORNER
- Topic: Bah! My ZX81 gone faulty! :-(
- Replies: 0
- Views: 25
Bah! My ZX81 gone faulty! :-(
I brought it down from the loft to give it a check-out before the 40th anniversary in March, plugged it in and switched it on without the RAM pack and it worked for a few seconds and then the output signal disappeared. Swapping the vLA81 ULA replacement out and putting the original ULA at least got ...
- Wed Jan 27, 2021 9:58 am
- Forum: SOFTWARE
- Topic: Spectre GCR on the TT.
- Replies: 4
- Views: 114
Re: Spectre GCR on the TT.
I'm afraid I don't know. I've never tried using the emulator on any platform.
It wouldn't really help me in this case as it wouldn't be able to read Spectre partitions or use the GCR hardware.
It wouldn't really help me in this case as it wouldn't be able to read Spectre partitions or use the GCR hardware.
- Wed Jan 27, 2021 9:54 am
- Forum: INTRODUCE YOURSELF
- Topic: Hi!
- Replies: 5
- Views: 58
- Tue Jan 26, 2021 9:50 pm
- Forum: SOFTWARE
- Topic: Spectre GCR on the TT.
- Replies: 4
- Views: 114
Re: Spectre GCR on the TT.
Thanks. I know that it has to page the two halves of the ROMs as the ROMs are 128KB but there's only 64KB visible at any one time. I'm guessing that it must make a workable copy in RAM.
- Tue Jan 26, 2021 6:49 pm
- Forum: SOFTWARE
- Topic: Spectre GCR on the TT.
- Replies: 4
- Views: 114
Spectre GCR on the TT.
I wonder if any of you know whether it's the Spectre GCR application or the emulated Mac produces the *BOOP* when you start the emulator? I'm yet again trying to get Spectre GCR to work on my TT and it would be useful to know if the Mac ROM code is actually starting or not. The symptoms are that whe...
- Mon Jan 25, 2021 9:14 pm
- Forum: EXXOS WEBSTORE INFORMATION
- Topic: VAT charges to EU states
- Replies: 36
- Views: 1350
Re: VAT charges to EU states
Ps: for UK shops they recommend that you clearly specify on the invoice that your products are made in UK The problem here is that the parts which make up the Exxos equipment aren't made in the UK, they're sourced from around the World, and there are feindishly complex rules about how much value ha...
- Mon Jan 25, 2021 12:07 pm
- Forum: RAM UPGRADES
- Topic: RAM chips randomly failing
- Replies: 2
- Views: 52
Re: RAM chips randomly failing
Or they're manufactured by MT.
- Mon Jan 25, 2021 8:28 am
- Forum: HARDWARE ISSUES
- Topic: Issue writing data on floppy (Write protected)
- Replies: 20
- Views: 744
Re: Issue writing data on floppy (Write protected)
Have you been testing the floppy with the UltraSATAN connected? If so then disconnect it and try again. I had similar issues on my machine with the TF536. The UltraSATAN's design is a bit iffy and pulls way too much current on the data lines, which can upset the DMA chip. The issue got worse over ti...
- Sun Jan 24, 2021 8:49 pm
- Forum: SOFTWARE
- Topic: Sozobon C's a bit broken isn't it?
- Replies: 12
- Views: 167
Re: Sozobon C's a bit broken isn't it?
The alternative to testing the whether the address is below the end of the cartridge port address range is to use a counter and test if that's less than the total, e.g.
Code: Select all
....
unsigned long i;
....
for (i = 0; i < 0x20000L ; i++)
printf("0x%02x\t", addr++);
....
- Sun Jan 24, 2021 6:40 pm
- Forum: SOFTWARE
- Topic: Sozobon C's a bit broken isn't it?
- Replies: 12
- Views: 167
Re: Sozobon C's a bit broken isn't it?
Yes, lines 8 & 9 should be:
Code: Select all
unsigned char *addr = (unsigned char *) CARTSTART;
unsigned char *endaddr = (unsigned char *) CARTEND;