Search found 692 matches
- 23 Apr 2024 12:20
- Forum: GENERAL DISCUSSIONS
- Topic: Sad times - Zilog announce Z80 EOL
- Replies: 5
- Views: 119
Re: Sad times - Zilog announce Z80 EOL
It is the end of an era, I had a quick look at stocks when I heard that news. I decided there was no cause for panic, surprisingly, I don't actually have that many Z80 systems. Thamks to a donation from Les a few years back, the spares work out at 2 CMOS Z80s for each real Z80 system, (MTX, ZX81, Sp...
- 01 Apr 2024 11:41
- Forum: NEW HARDWARE
- Topic: System test rom/Board
- Replies: 32
- Views: 37819
Re: System test rom/Board
Sounds like you're building something like : https://www.mtxworld.dk/memorum/viewtopic.php?p=3299#p3299 Writing Z80 code to run with no working ram needs a few "tricks" so while I've posted the early versions to show how it's done. I refrained from publising the final code. So disassemblin...
- 31 Mar 2024 21:37
- Forum: NEW HARDWARE
- Topic: System test rom/Board
- Replies: 32
- Views: 37819
Re: System test rom/Board
Answers in order: Build 234, no copies of that source remain. Build 245, the source for that is on the Raspberry Pi Z80 dev system here somwhere. However, it needed a purpose written assembler to build. All the tricks and tweaks needed to run with no ram were written into the assembler as multibye a...
- 06 Mar 2024 11:43
- Forum: MFX
- Topic: MFX with a difference
- Replies: 18
- Views: 1890
Re: MFX with a difference
The bright yellow labels are a bit subtle I guess .... True, but you mad tinkerers stick labels on anything and everything :lol: [has a quick check of the Dev MTX] There's only 6 labled chips: The 3 system ROMs The motherboard PAL replacement, currently the MTX500 GAL is fitted, there's a MTX512 ve...
- 05 Mar 2024 18:17
- Forum: MFX
- Topic: MFX with a difference
- Replies: 18
- Views: 1890
- 05 Mar 2024 12:21
- Forum: MFX
- Topic: MFX with a difference
- Replies: 18
- Views: 1890
Re: MFX with a difference
You haven't a hope in hell of getting the case back together? Absolutely not. That's where the PS2 keyboard interfacre really comes in to it's own :) That MTX is one Memotech altered in the factory to use eprom instead of mask rom. So I have an alternate set of eproms fitted** that has the keyboard...
- 05 Mar 2024 12:01
- Forum: MFX
- Topic: MFX with a difference
- Replies: 18
- Views: 1890
Re: MFX with a difference
It is indeed a larger FPGA, it's a Cyclone 4 device EP4C6E which has 30k of onboard ram. That's compared to 13k ram on the Cyclone 2 EP2C5. The original build MFX used the internal ram for the 80 column board memory, plus buffers for the sprite rendering on the VDP. The external chip was used for th...
- 04 Mar 2024 14:24
- Forum: MFX
- Topic: MFX with a difference
- Replies: 18
- Views: 1890
MFX with a difference
See anything different about the MFX board in the photos?
- 25 Feb 2024 15:20
- Forum: HARDWARE
- Topic: MFX Availability
- Replies: 8
- Views: 2124
Re: MFX Availability
I'll give him a poke on your behalf too
- 25 Feb 2024 14:53
- Forum: HARDWARE
- Topic: MFX Availability
- Replies: 8
- Views: 2124
Re: MFX Availability
Send Dave an e-mail using the link at the bottom of http://primrosebank.net/computers/mtx/p ... _order.htm
The page seems to suggest there are boards available from the last batch I built for him
The page seems to suggest there are boards available from the last batch I built for him