Search found 19 matches
- Wed Oct 06, 2021 9:38 am
- Forum: Hardware
- Topic: MZ80B - BootRom Disc
- Replies: 12
- Views: 8551
Re: MZ80B - BootRom Disc
So, a general boot software is working and allows starting of several other software systems in the larger ROM.
- Tue Oct 05, 2021 4:33 pm
- Forum: Other
- Topic: SB-1511 for Sharp MZ80B ???
- Replies: 0
- Views: 7719
SB-1511 for Sharp MZ80B ???
Has anyone a memory dump of the SB-1511 available ?
Marten
Marten
- Thu Sep 09, 2021 5:15 am
- Forum: Hardware
- Topic: MZ80B - BootRom Disc
- Replies: 12
- Views: 8551
Re: MZ80B - BootRom Disc
Hey, the additional signals ( I used a CPLD to do this low level work: ATF22V10 or ATF16V8): Here parts of my CPLD code (be aware: !m1 => M1 = 1; aX => aX = 1, !aX => aX = 0 etc) /* Signals for the Boot-ROM Disc of the MZ80B */ /* 11111001 = F9 (read value at address) */ CEROM = a7 & a6 & a5...
- Fri Sep 03, 2021 2:14 pm
- Forum: Hardware
- Topic: MZ80B - BootRom Disc
- Replies: 12
- Views: 8551
Re: MZ80B - BootRom Disc
Ah, yes * the software code can be found in the IPL listing starting at 05EFh * the schematic of my boot-rom is added to the message But be aware that I am not an electronic man ... PS.: The only major thing you should consider is, that the first byte of the boot ROM has to be a value of zero - so I...
- Thu Sep 02, 2021 7:31 pm
- Forum: Hardware
- Topic: MZ80B - BootRom Disc
- Replies: 12
- Views: 8551
Re: MZ80B - BootRom Disc
So here is - I hope - the final edition of the card in terms of features (etc). In addition to the card shown above two changes have been made: * the iteration through the RAM/ROM disc is now possible over the whole range and not only within the 64K page size * the RAM (512 K) is now battery buffere...
- Sat Jul 24, 2021 3:24 pm
- Forum: Hardware
- Topic: MZ80B - BootRom Disc
- Replies: 12
- Views: 8551
Re: MZ80B - BootRom Disc
By the way - thanks to the RC2014 community, where I got the initial YM2149/8910 schematic and from some MZ800 person, who created an new RAM file card for the 800. I have to make a second revision, because the /M1 signal has not been considered here (and that my lead to errors during IRQ handling),...
- Sat Jul 24, 2021 3:16 pm
- Forum: Hardware
- Topic: MZ80B - BootRom Disc
- Replies: 12
- Views: 8551
Re: MZ80B - BootRom Disc
So, the left part is also now populated and it works. To summarize: a) The YM2149 is located at 0x60/0x61 and is feeded by the 4 MHz system clock (therefore a AY8910 will not work) a.1) One port of the YM2149 is feeding LEDs a.2) One port of the YM2149 is used for switches (for own software ) b) The...
- Thu Jul 22, 2021 3:21 pm
- Forum: Other
- Topic: MZ80B - SP4515 as mzf available ?
- Replies: 0
- Views: 5203
MZ80B - SP4515 as mzf available ?
Is the SP4515 (Pascal system) somewhere available as mzf file (including the Monitor 1511) ?
- Thu Jul 22, 2021 8:54 am
- Forum: Hardware
- Topic: Any way to improve the screen brightness of an MZ80B
- Replies: 6
- Views: 3367
Re: Any way to improve the screen brightness of an MZ80B
Ok, both resistor at their maximum - and I still do not see the flyback-lines.
Do you really mean, to replace ALL capacitors ? Best way to do it ? Replace one and check - then next ? Any special candidates to replace first ?
Do you really mean, to replace ALL capacitors ? Best way to do it ? Replace one and check - then next ? Any special candidates to replace first ?
- Tue Jul 20, 2021 7:36 pm
- Forum: Hardware
- Topic: MZ80B - BootRom Disc
- Replies: 12
- Views: 8551
Re: MZ80B - BootRom Disc
So, the second part of the PCB has been populated - the sound IC has been added and I get a sound, can turn on/off 8 LEDs and have some configuration switches for further project.
The third part on the PCB (left part) is actually NOT working, some kind of error somewhere ...
The third part on the PCB (left part) is actually NOT working, some kind of error somewhere ...